Exact Chemical Formulae - IUPAC Gold Book
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Gold Book Ag (in 3 terms) Ag -- pHAg -- solute-volatilization interferenceAg+ -- interfering substance Ag2S (in 1 term) Ag2S -- crystalline electrodes AgBr (in 1 term) AgBr -- molecular rearrangement AgCl (in 2 terms) AgCl -- pHAgCl -- gravimetric method AgI (in 2 terms) α-AgI -- polymorphic transitionAgI -- crystalline electrodes AgNO3 (in 1 term) AgNO3 -- gravimetric method Al (in 1 term) Al -- solute-volatilization interference Al2 (in 1 term) 2Al3+ -- mean activity of an electrolyte in solution Al2MgO4 (in 1 term) MgAl2O4 -- solute-volatilization interference AlCl3 (in 1 term) AlCl3 -- ionization AlNb3 (in 1 term) Nb3Al -- superconducting transition Ar (in 6 terms) Ar+ -- diamond by CVDAr -- gas-filled phototubeAr -- excimer lampAr+ -- diamond-like carbon filmsAr -- cryogenic samplingAr -- Penning gas mixture Ar2 (in 1 term) Ar2 -- excimer lamp ArHOSe (in 1 term) ArSeOH -- selenenic acids As (in 2 terms) As -- photoconductive detectorAs -- poison in catalysis As3H11 (in 1 term) H4AsAsH3AsH4 -- arsanes As3H5 (in 1 term) H2AsAsHAsH2 -- arsanes AsF5 (in 1 term) AsF5 -- dopant AsH2 (in 1 term) H2As+ -- arsanylium ions AsH2O (in 1 term) H2As(=O)+ -- arsanylium ions AsH2O2 (in 1 term) HAs(OH)2 -- arsonous acids AsH3 (in 2 terms) AsH3 -- arsinesAsH3 -- arsanes AsH3O (in 2 terms) H2AsOH -- arsinous acidsH3As=O -- arsine oxides AsH3O2 (in 1 term) AsH3O2 -- arsinic acids AsH3O3 (in 1 term) AsH3O3 -- arsonic acids AsH4 (in 1 term) (H4As+) -- onium compounds AsH5 (in 1 term) AsH5 -- arsoranes Au (in 2 terms) Au -- disproportionation197Au -- nuclear quadrupole moment (spectroscopic) AuFe (in 1 term) Au–Fe -- spin-glass transitionB (in 1 term) B -- organically modified silica B2BaO4 (in 1 term) BaB2O4 -- optical parametric oscillator B2H (in 1 term) B–H–B -- electron-deficient bond B2H6 (in 1 term) B2H6 -- electron-deficient bond B5H9 (in 1 term) B5H9 -- boranes Ba (in 1 term) Ba2+ -- mean activity of an electrolyte in solution BaO3Ti (in 1 term) BaTiO3 -- ferroelectric (antiferroelectric) transition BH (in 2 terms) HB+ -- heteroconjugationHB: -- carbene analogues BH6N (in 1 term) H3N
BH3 -- dative bond BiH3 (in 2 terms) BiH3 -- bismuthinesBiH3 -- bismuthanes BiH4 (in 1 term) (H4Bi+) -- onium compounds BN (in 1 term) NB -- dative bond Br (in 9 terms) Br -- excimer lampBr -- sulfonium compoundsBr -- addition reactionBr -- telomerizationBr -- fragmentationBr -- molecular rearrangementBr -- allylic substitution reactionBr− -- leaving groupBr+ -- halonium ions BrH (in 1 term) BrH -- leaving group BrH2 (in 1 term) (H2Br+) -- onium compounds BrKr (in 1 term) KrBr -- excimer lamp BrXe (in 1 term) XeBr -- excimer lamp C (in 15 terms) C -- multiply labelledC -- transferasesC -- strain energy–C= -- heteroarenesC -- organically modified silica13C -- chemical shiftC -- potential-energy (reaction) surfaceC -- tautomerismC -- dipolar compoundsC -- methylotrophic microorganismsC -- hydrogen bond in theoretical organic chemistryC -- repulsive potential-energy surface12C -- relative micellar mass12C -- molecular ion in mass spectrometryC -- spin polarization C10 (in 2 terms) C10 -- monoterpenoidsC10 -- terpenes C10H10 (in 2 terms) C10H10 -- non-Kekulé moleculesC10H10 -- polyquinanes (polyquinenes) C10H14NO (in 1 term) C10H14NO -- amidium ions C10H15NS (in 1 term) (C2H5)2S=NPh -- sulfimides C10H16 (in 2 terms) C10H16 -- electrocyclic reactionC10H16 -- ring assembly C10H18 (in 1 term) C10H18 -- cis-trans isomers C10H20 (in 1 term) C10H20 -- iridoids C10H6 (in 1 term) C10H6 -- dehydroarenes C10H8 (in 2 terms) C10H8 -- fulvalenesC10H8 -- alternant C10H8O (in 1 term) C10H8O -- phenols C11H12O4 (in 1 term) C11H12O4 -- acylals C11H14 (in 2 terms) C11H14 -- hula-twist (HT) mechanismC11H14 -- bicycle-pedal (BP) mechanism C11H6O3 (in 1 term) C11H6O3 -- furocoumarins C12H10 (in 1 term) C12H10 -- ring assembly C12H10N2 (in 1 term) PhN=NPh -- azo compounds C12H10N2O (in 1 term) C12H10N2O -- azoxy compounds C12H10O5S2 (in 1 term) PhS(=O)2OS(=O)2Ph -- sulfonic anhydrides C12H10OS (in 1 term) Ph2S=O -- sulfoxides C12H12N2S (in 1 term) Ph2S(=NH)2 -- sulfonediimines C12H14 (in 1 term) C12H14 -- anti C12H24O6 (in 1 term) C12H24O6 -- crown C12H8 (in 1 term) C12H8 -- ring assembly C12H8Cl2 (in 1 term) C12H8Cl2 -- meso-compound C12O9 (in 1 term) C12O9 -- oxocarbons C13H10O (in 1 term) Ph2C–O.− -- radical ion C13H12O2 (in 1 term) C13H12O2 -- bisphenols C13H13N3 (in 1 term) PhN=N–NPhMe -- diazoamino compounds C13H13OP (in 1 term) (Ph)2POCH3 -- esters C13H14 (in 1 term) C13H14 -- spiro compounds C13H14O4 (in 1 term) C13H14O4 -- cycloaddition C13H16O7 (in 1 term) C13H16O7 -- glycosides C14H10 (in 2 terms) C14H10 -- quinarenesC14H10 -- acenes C14H10O (in 1 term) C14H10O -- epoxy compounds C14H10O9 (in 1 term) C14H10O9 -- depsides C14H10OS2 (in 1 term) C14H10OS2 -- acid anhydrides C14H12 (in 1 term) C14H12 -- cycloaddition C14H12N6O3 (in 1 term) C14H12N6O3 -- folates C14H24 (in 1 term) C14H24 -- propellanes C15 (in 2 terms) C15 -- sesquiterpenoidsC15 -- terpenes C15H10O2 (in 1 term) C15H10O2 -- flavonoids (isoflavonoids and neoflavonoids) C15H11O (in 1 term) C15H11O -- anthocyanidins C15H16N (in 1 term) (p-Me2NC6H4)2CHPh -- leuco bases C16H10 (in 1 term) C16H10 -- ortho- and peri-fused (polycyclic compounds) C16H14O (in 1 term) PhC(=O)CH=C(CH3)Ph -- dypnones C16H16 (in 1 term) C16H16 -- cyclophanes C17H16Cl3 (in 1 term) C17H16Cl3 -- chain transfer C17H21N2 (in 1 term) C17H21N2 -- cyanine dyes C17H21NO4 (in 1 term) C17H21NO4 -- pseudo-asymmetric carbon atom C17H28 (in 1 term) C17H28 -- steroids C18H12 (in 1 term) C18H12 -- ortho-fused (polycyclic compounds) C18H14 (in 1 term) C18H14 -- quinarenes C18H34O9 (in 1 term) C18H34O9 -- in-out isomerism C18H36N2O6 (in 1 term) C18H36N2O6 -- cryptand C19H12 (in 1 term) C19H12 -- ortho- and peri-fused (polycyclic compounds) C19H14N4 (in 1 term) C19H14N4 -- tetrapyrroles C19H14O5S (in 1 term) C19H14O5S -- sulfonphthaleins C19H15 (in 1 term) C19H15 -- fragmentation C19H16 (in 1 term) C19H16 -- bicycle rearrangement C19H17P (in 1 term) Ph3P+=CH2 -- ylides C19H22N4 (in 1 term) C19H22N4 -- corrinoids (cobalamines, corphyrins, corrins, vitamin B12 compounds) C19H30 (in 1 term) C19H30 -- cyclo- C19H32 (in 3 terms) C19H32 -- cyclo-C19H32 -- abeo-C19H32 -- seco- C19H32O (in 1 term) C19H32O -- α (alpha), β (beta) C19H34 (in 1 term) C19H34 -- seco- C2 (in 7 terms) C–C -- lyasesC–C -- eclipsing strainC–C -- orbital symmetryC–C -- hydrolasesC–C -- ligases (synthetases)C–C -- photohydrationC–C -- symbiosis C20 (in 5 terms) C20 -- prostaglandinsC20 -- leukotrienesC20 -- terpenesC20 -- diterpenoidsC20 -- icosanoids C20H12O5 (in 1 term) C20H12O5 -- xanthene dyes C20H14N4 (in 1 term) C20H14N4 -- porphyrins C20H14O4 (in 1 term) C20H14O4 -- phthaleins C20H16O2 (in 1 term) C20H16O2 -- fragmentation C20H19OP (in 1 term) C20H19OP -- betaines C20H20O5 (in 1 term) C20H20O5 -- lignans C20H38O2 (in 1 term) C20H38O2 -- prostaglandins C22H23ClN2O8 (in 1 term) C22H23ClN2O8 -- tetracyclines C22H26O6 (in 1 term) C22H26O6 -- lignans C23H22O6 (in 1 term) C23H22O6 -- rotenoids C25 (in 2 terms) C25 -- terpenesC25 -- sesterterpenoids C26H16 (in 2 terms) C26H16 -- helicenesC26H16 -- helicity C27H54N2 (in 1 term) C27H54N2 -- in-out isomerism C2H (in 1 term) HC≡C− -- carbanion C2H10O3Si3 (in 1 term) C2H10O3Si3 -- cyclosiloxanes C2H2 (in 5 terms) H2C=C: -- carbenesH2C=C: -- vinylidenes–CH=CH– -- heteroarenesC2H2 -- flow rate in flame emission and absorption spectrometryC2H2 -- local fraction atomized C2H2O (in 2 terms) CH2=C=O -- heterocumulenesCH2=C=O -- isoelectronic C2H3 (in 1 term) CH2=CH– -- vinylic groups C2H3AgO2 (in 1 term) C2H3AgO2 -- molecular rearrangement C2H3Cl (in 2 terms) C2H3Cl -- isodesmic reaction:Cl–CH=CH2 -- conjugated system (conjugation) C2H3Cl3 (in 1 term) C2H3Cl3 -- isodesmic reaction C2H3ClO (in 1 term) C2H3ClO -- acyl halides C2H3N (in 1 term) CH3C≡N -- cyanides C2H3NS (in 1 term) CH3SC≡N -- thiocyanates C2H3O (in 1 term) CH3C(=O)– -- organyl groups C2H3O2 (in 5 terms) –CH2CO2H -- prochiralityC2H3O2 -- ionizationC2H3O2 -- proton transfer reactionCH3CO2− -- Brønsted baseC2H3O2 -- nucleophilic catalysis C2H4 (in 14 terms) CH2=CH2 -- homodesmotic reactionC2H4 -- disproportionationC2H4 -- de Mayo reactionC2H4 -- isodesmic reactionC2H4 -- attachment–CH2–CH2– -- meso structures in polymersC2H4 -- ene reactionC2H4 -- sorptive insertion in surface catalysis+CH2–+CH2 -- dicarbenium ionsC2H4 -- hydrationC2H4 -- reactive adsorptionC2H4 -- negative hyper-conjugationC2H4 -- hyperconjugationC2H4 -- sudden polarization C2H4Cl2 (in 1 term) C2H4Cl2 -- isodesmic reaction C2H4Cl2NO (in 2 terms) C2H4Cl2NO -- aminoxyl radicals(ClCH2)2N–O. -- nitroxides C2H4Cl2O (in 1 term) C2H4Cl2O -- α-addition (alpha-addition) C2H4Cl3Pt (in 1 term) [PtCl3(CH2=CH2)]− -- chelation C2H4F (in 2 terms) C2H4F -- negative hyper-conjugationC2H4F -- hyperconjugation C2H4N (in 1 term) CH3–CH=N. -- iminyl radicals C2H4O (in 1 term) C2H4O -- stoichiometry C2H4O2 (in 7 terms) C2H4O2 -- ionizationCH3CO2H -- Brønsted acidC2H4O2 -- nucleophilic catalysisCH3CO2H -- prochiralityC2H4O2 -- proton transfer reactionC2H4O2 -- leaving groupC2H4O2 -- catalytic hydrogenolysis C2H4O3 (in 2 terms) CH3C(=O)OOH -- per acidsCH3C(=O)OOH -- peroxy acids C2H5 (in 3 terms) CH3CH2+ -- carbenium ionC2H5 -- disproportionationCH3CH2– -- organyl groups C2H5Br (in 2 terms) C2H581Br+. -- isotopic molecular ionC2H579Br -- molecular ion in mass spectrometry C2H5BrO (in 1 term) BrCH2CH2OH -- halohydrins C2H5Cl (in 1 term) C2H5Cl -- nucleophile (nucleophilic) C2H5N (in 1 term) MeN=CH2 -- heteroalkenes C2H5N3O2 (in 1 term) H2NNHC(=O)C(=O)NH2 -- semioxamazones C2H5NO2 (in 1 term) H3N+CH2C(=O)O− -- zwitterionic compounds/zwitterions C2H6 (in 6 terms) CH3–CH3 -- homodesmotic reactionC2H6 -- disproportionationC2H6 -- catalytic hydrogenolysisC2H6 -- dimerizationC2H6 -- pseudorotationCH313CH3 -- principal ion in mass spectrometry C2H6CuLi (in 1 term) Li+[CuMe2]− -- organometallic compounds C2H6N2 (in 2 terms) C2H6N2 -- carboxamidinesC2H6N2 -- isoelectronic C2H6N4S2 (in 1 term) H2NC(=NH)SSC(=NH)NH2 -- formamidine disulfides C2H6NO (in 1 term) C2H6NO -- aminoxides C2H6O (in 5 terms) CH3–CH[2H]–OH -- singly labelledCH3OCH3 -- constitutional isomerismCH3CH2OH -- prochiralityCH3–CH2–[18O][2H] -- mixed labelledC2H6O -- hydration C2H6O2 (in 1 term) HOCH2CH2OH -- glycols C2H6S (in 1 term) MeCH2SH -- thiols C2H7 (in 1 term) [C2H7]+ -- alkanium ions C2H7As (in 1 term) CH3CH2AsH2 -- arsines C2H7AsO2 (in 1 term) C2H7AsO2 -- arsinic acids C2H7NS (in 2 terms) CH3CH2SNH2 -- amidesC2H5SNH2 -- sulfenamides C2H7S (in 1 term) (CH3)2S+H -- onium compounds C2HNa (in 1 term) NaC≡CH -- acetylides C2N (in 1 term) (CN)2 -- pseudohalogens C3 (in 1 term) C=C=C -- chirality axis C30 (in 2 terms) C30 -- terpenesC30 -- triterpenoids C30H42O (in 1 term) C30H42O -- carotenoids C38H24Cl4 (in 1 term) C38H24Cl4 -- biradical C3H3AsO (in 1 term) (CH3)3As=O -- arsine oxides C3H3Bi (in 1 term) (CH3)3Bi -- bismuthines C3H3N (in 1 term) CH2=CH–C≡N -- conjugated system (conjugation) C3H4 (in 2 terms) H2C=CHCH: -- carbenesH2C=CHC:H -- vinyl carbenes C3H4O2 (in 1 term) C3H4O2 -- de Mayo reaction C3H5 (in 4 terms) H2C=CHCH2+ -- allylic intermediatesC3H5 -- delocalizationCH3CH2C… -- alkylidynesCH2=CHCH2 -- allylic groups C3H5NO (in 2 terms) C3H5NO -- lactamsHOCH2CH2C≡N -- cyanohydrins C3H5NO3 (in 1 term) C3H5NO3 -- amic acids C3H5NO3S (in 1 term) C3H5NO3S -- imides C3H5NSe (in 1 term) CH3CH2SeCN -- selenocyanates C3H5O (in 2 terms) C3H5O -- contributing structureC3H5O -- abstraction C3H6 (in 8 terms) c-(CH2)3 -- homodesmotic reaction+CH2CH2–+CH2 -- dicarbenium ionsC3H6.+ -- radical ionC3H6 -- corrinoids (cobalamines, corphyrins, corrins, vitamin B12 compounds) H2C.–CH2–C.H2 -- diradicalsCH3CH2CH: -- alkylidenes–CH2CH2CH2– -- hydrocarbylene groupsC3H6 -- ene reaction C3H6O (in 7 terms) C3H6O -- abstractionC3H6O -- epoxy compoundsC3H6O -- proton transfer reactionC3H6O -- Paterno–Büchi reactionC3H6O -- isoelectronicC3H6O -- fragmentationC3H6O -- dimerization C3H6S (in 1 term) CH3CH2C(=S)H -- thioaldehydes C3H7 (in 2 terms) CH3CH2CH2+ -- carbenium ionCH3CH2C.H2 -- alkyl radicals C3H7Br (in 1 term) C3H7Br -- molecular rearrangement C3H7ClO (in 1 term) ClCH2CH2CH2OH -- halohydrins C3H7N (in 1 term) EtCH=NH -- aldimines C3H7O (in 2 terms) C3H7O -- fragmentationC3H7O -- proton transfer reaction C3H8 (in 2 terms) C3H8 -- catalytic hydrogenolysisCH3CH2CH3 -- homodesmotic reaction C3H8O2S (in 2 terms) (CH3)2CHS(=O)OH -- sulfinic acidsC2H5S(=O)2CH3 -- sulfones C3H9ClP (in 1 term) Cl(CH3)3P+ -- onium compounds C3H9ClS (in 1 term) [(CH3)3S]+Cl− -- sulfonium compounds C3H9N (in 2 terms) C3H9N -- ammoniumyl radical ionsC3H9N -- leaving group C3H9NO (in 1 term) (CH3)3N+–O− -- zwitterionic compounds/zwitterions C3H9NO2S (in 1 term) C3H9NO2S -- amides C3O2 (in 2 terms) O=C=C=C=O -- heterocumulenesO=C=C=C=O -- oxocarbons C40 (in 3 terms) C40 -- terpenesC40 -- carotenoidsC40 -- tetraterpenoids C40H56 (in 2 terms) C40H56 -- retroC40H56 -- carotenoids C40H56O2 (in 1 term) C40H56O2 -- carotenoids C41H29NO (in 1 term) C41H29NO -- Dimroth–Reichardt ET Parameter C4H10 (in 1 term) C4H10 -- catalytic hydrogenolysis C4H10Mg (in 1 term) Et2Mg -- organometallic compounds C4H10N (in 1 term) C4H10N -- pre-equilibrium (prior equilibrium) C4H10O (in 4 terms) C4H10O -- fragmentationCH3CH2OCH2CH3 -- ethersCH3CHOHCH2CH3 -- prochiralityC4H10O -- diastereotopic C4H10O3 (in 1 term) HC(OCH3)3 -- ortho esters C4H11N (in 1 term) (CH3)3N+–C−H2 -- ylides C4H11NO (in 1 term) C4H11NO -- pre-equilibrium (prior equilibrium) C4H11O3PS (in 1 term) C4H11O3PS -- betaines C4H12N2 (in 1 term) C4H12N2 -- amine imides C4H13NO (in 1 term) [(CH3)4N]+OH− -- quaternary ammonium compounds C4H4N2 (in 2 terms) C4H4N2 -- pyrimidine basesC4H4N2 -- heteroarenes C4H4O2 (in 2 terms) HO[CH2]4OH -- glycolsC4H4O2 -- isolated double bonds C4H4S (in 1 term) C4H4S -- heteroarenes C4H5N (in 1 term) C4H5N -- indicated hydrogen C4H5NO2 (in 1 term) C4H5NO2 -- imides C4H6 (in 9 terms) C4H6 -- attachmentC4H6 -- non-Kekulé moleculesC4H6 -- addition reactionCH2=C(C.H2)2 -- trimethylenemethanesCH2=CH–CH=CH2 -- dienesCH2=CH–CH=CH2 -- conjugated system (conjugation)C4H6 -- cheletropic reactionC4H6 -- s-cis, s-transCH2=CH–CH=CH2 -- homodesmotic reaction C4H6Br2 (in 1 term) C4H6Br2 -- addition reaction C4H6O (in 1 term) C4H6O -- oxa-di-π-methane rearrangement C4H6O2S (in 1 term) C4H6O2S -- cheletropic reaction C4H6O3 (in 2 terms) C4H6O3 -- acid anhydridesC4H6O3 -- nucleophilic catalysis C4H6O4 (in 1 term) C4H6O4 -- oxidative coupling C4H6O6 (in 1 term) C4H6O6 -- meso-compound C4H7Br (in 1 term) C4H7Br -- allylic substitution reaction C4H7ClO2Zn (in 1 term) ClZnCH2C(=O)OEt -- organometallic compounds C4H7NO (in 1 term) (CH3)2C(OH)C≡N -- cyanohydrins C4H7Y (in 1 term) C4H7Y -- chain polymerization C4H8 (in 4 terms) C4H8 -- addition reactionC4H8 -- cycloalkanesC4H8 -- antiC4H8 -- hyperconjugation C4H8Br2 (in 1 term) C4H8Br2 -- anti C4H8O (in 3 terms) C4H8O -- multiply labelledCH3CH2COCH3 -- prochiralityC4H8O -- allylic substitution reaction C4H8S (in 1 term) CH3C(=S)CH2CH3 -- thioketones C4H9 (in 1 term) C4H9 -- hyperconjugation C4H9Br (in 1 term) C4H9Br -- addition reaction C4H9FO (in 1 term) C4H9FO -- diastereotopic C4H9N (in 1 term) C4H9N -- pre-equilibrium (prior equilibrium) C4H9O (in 1 term) C4H9O -- fragmentation C4O4 (in 1 term) C4O4 -- oxocarbons C5 (in 1 term) C5 -- terpenes C5H10 (in 2 terms) C5H10 -- envelope conformationC5H10 -- ene reaction C5H10O (in 2 terms) C5H10O -- prochiralityC5H10O -- molecular rearrangement C5H10O2 (in 1 term) C5H10O2 -- molecular rearrangement C5H10O4 (in 1 term) C5H10O4 -- monosaccharides C5H11NO2 (in 1 term) C5H11NO2 -- betaines C5H12 (in 1 term) Me4C -- symbiosis C5H12O4 (in 1 term) C(OCH3)4 -- ortho esters C5H12O5 (in 1 term) C5H12O5 -- meso-compound C5H14NO4P (in 1 term) Me3N+–CH2CH2–OP(=O)(OH)O− -- phospho C5H15Ta (in 1 term) TaMe5 -- homoleptic C5H3BrN4 (in 1 term) C5H3BrN4 -- tele-substitution C5H4 (in 2 terms) C5H4 -- nonclassical structureC5H4 -- electrocyclic reaction C5H4N2O (in 1 term) C5H4N2O -- topomerization C5H4N4 (in 1 term) C5H4N4 -- purine bases C5H5N (in 2 terms) C5H5N+ -- organoheteryl groupsC5H5N -- nucleophilic catalysis C5H5N5 (in 1 term) C5H5N5 -- tele-substitution C5H5NO (in 1 term) C5H5NO -- tautomerism C5H5NOS (in 1 term) C5H5NOS -- penems C5H5OP (in 1 term) C5H5OP -- indicated hydrogen C5H5P (in 1 term) C5H5P -- indicated hydrogen C5H7NOS (in 1 term) C5H7NOS -- penams C5H7O2 (in 1 term) C5H7O2 -- carbanion C5H8 (in 3 terms) C5H8 -- di-π-methane rearrangementC5H8 -- sigmatropic rearrangement[CH2=C(CH3)CH=CH2] -- terpenes C5H8O2 (in 1 term) C5H8O2 -- de Mayo reaction C5H8O3 (in 1 term) HC(=O)CH2CH2CH2C(=O)OH -- oxo carboxylic acids C5H8O5 (in 1 term) HO2CCH2CHOHCH2CO2H -- prochirality C5H8O7 (in 1 term) C5H8O7 -- pseudo-asymmetric carbon atom C5H8OS2 (in 1 term) CH3C(=O)SC(=S)CH2CH3 -- thioanhydrides C5H9Br (in 1 term) C5H9Br -- molecular rearrangement C5H9N (in 1 term) C5H9N -- aza-di-π-methane rearrangement C5H9NO2 (in 1 term) C5H9NO2 -- imino acids C5H9O (in 1 term) C5H9O -- ambident C6H10 (in 4 terms) C6H10 -- degenerate rearrangementC6H10 -- half-chairC6H10 -- attachmentC6H10 -- carbenes C6H10Br2NiP2 (in 1 term) Ni[(CH3)2PCH2CH2P(CH3)2]Br2 -- κ (kappa) in inorganic nomenclature C6H10BrF (in 1 term) C6H10BrF -- anti C6H10O3 (in 1 term) C6H10O3 -- tautomerism C6H10O4 (in 1 term) C6H10O4 -- enoses C6H10O7 (in 2 terms) C6H10O7 -- uronic acidsC6H10O7 -- ketoaldonic acids C6H11BrO5 (in 1 term) C6H11BrO5 -- anomeric effect C6H11NO (in 2 terms) C6H11NO -- prochiralityC6H11NO -- lactams C6H11S (in 1 term) C6H11S -- sulfonium compounds C6H12 (in 4 terms) C6H12 -- oxidative additionC6H12 -- chair, boat, twistC6H12 -- Paterno–Büchi reactionC6H12 -- cyclo- C6H12O2 (in 1 term) C6H12O2 -- dimerization C6H12O3 (in 1 term) C6H12O3 -- acetonides C6H12O5 (in 1 term) C6H12O5 -- α (alpha), β (beta) C6H12O6 (in 4 terms) C6H12O6 -- aldosesC6H12O6 -- Haworth representationC6H12O6 -- ketosesC6H12O6 -- α (alpha), β (beta) C6H12O7 (in 1 term) C6H12O7 -- aldonic acids C6H12Si (in 1 term) C6H12Si -- di-π-silane rearrangement C6H13NO5 (in 1 term) C6H13NO5 -- amino sugars C6H14 (in 1 term) C6H14 -- cyclo- C6H14LiN (in 1 term) C6H14LiN -- amides C6H14N (in 1 term) C6H14N -- abstraction C6H14O6 (in 1 term) C6H14O6 -- Haworth representation C6H15B (in 1 term) Et3B -- organometallic compounds C6H15N (in 1 term) C6H15N -- abstraction C6H4 (in 1 term) C6H4 -- aryne C6H4NS2 (in 1 term) C6H4NS2 -- Herz compounds C6H4O2 (in 2 terms) C6H4O2 -- quinonesC6H4O2 -- quinhydrones C6H5 (in 1 term) C6H5 -- aryl cations C6H5AsCa (in 1 term) CaAsPh -- arsenides C6H5I (in 1 term) C6H5I -- isotopic scrambling C6H5KN2O (in 1 term) PhN=NO−K+ -- diazoates C6H5N2 (in 2 terms) C6H5N2 -- isotopic scramblingPhN+≡N -- diazonium salts C6H5N3 (in 1 term) PhN3 -- azides C6H5NO2 (in 1 term) C6H5NO2 -- electrophile (electrophilic) C6H5Y (in 1 term) C6H5Y -- Hammett equation (Hammett relation) C6H6 (in 7 terms) C6H62+ -- nonclassical structureC6H6 -- Kekulé structure (for aromatic compounds)C6H6 -- electrophile (electrophilic)C6H6 -- catalytic hydrogenolysisC6H6 -- homodesmotic reactionC6H6 -- fulvenesC6H6.+ -- radical ion C6H6N2 (in 1 term) C6H6N2 -- quinonimines (quinone imines) C6H6N2O (in 1 term) PhN=NOH -- diazoates C6H6NNa (in 1 term) C6H6NNa -- anilides C6H6O (in 2 terms) C6H6O -- valence tautomerizationC6H6O -- arene epoxides C6H6O2 (in 1 term) C6H6O2 -- quinhydrones C6H6O4 (in 1 term) C6H6O4 -- cycloaddition C6H6O4S (in 1 term) PhS(=O)2OOH -- peroxy acids C6H6OS (in 1 term) PhSOH -- sulfenic acids C6H7 (in 1 term) C6H7+ -- arenium ions C6H7N (in 3 terms) C6H5NH2 -- transformationC6H7N -- isotopic scramblingC6H7N -- ammoniumyl radical ions C6H8 (in 1 term) C6H8 -- electrocyclic reaction C6H8N2S (in 1 term) PhS(=NH)NH2 -- sulfinamidines C6H8NO2P (in 1 term) C6H8NO2P -- amides C6H9Br (in 1 term) C6H9Br -- anti C6H9N3O2 (in 1 term) C6H9N3O2 -- pros in histidine nomenclature C6H9NOS (in 1 term) C6H9NOS -- cephams C6H9Sb (in 1 term) (CH2=CH)3Sb -- stibines C6N4 (in 1 term) C6N4 -- π-adduct C7H10BrF (in 1 term) C7H10BrF -- endo, exo, syn, anti C7H12 (in 1 term) C7H12 -- anti C7H12ClN (in 1 term) C7H12ClN -- acyl halides C7H14N2 (in 1 term) C7H14N2 -- carboxamidines C7H14O (in 1 term) C7H14O -- Norrish Type II photoreaction C7H14O6 (in 1 term) C7H14O6 -- anomeric effect C7H16 (in 1 term) C7H16 -- catalytic dehydrocyclization C7H4ClO2 (in 1 term) C7H4ClO2 -- isodesmic reaction C7H4O3S2 (in 1 term) C7H4O3S2 -- cyclic acid anhydrides (cyclic anhydrides) C7H5ClO2 (in 1 term) C7H5ClO2 -- isodesmic reaction C7H5NO (in 1 term) PhOCN -- cyanates C7H5O2 (in 1 term) C7H5O2 -- isodesmic reaction C7H6 (in 1 term) C7H6 -- annulenylidenes C7H6FeO2S (in 1 term) [Fe(CO)3(C4H6SO)] -- η (eta or hapto) in inorganic nomenclature C7H6N (in 1 term) C7H6N -- nitrilium ions C7H6O (in 2 terms) C7H6O -- quinomethanesC7H6O -- tropones C7H6O2 (in 2 terms) C7H6O2 -- isodesmic reactionC7H6O2 -- tropolones C7H6OS (in 1 term) PhC(=S=O)H -- sulfines C7H7 (in 5 terms) C7H7 -- common-ion effect (on rates)C7H7 -- benzylic intermediates(C7H72+) -- mass-to-charge ratioC7H7+ -- tropylium ionsC7H7 -- hyperconjugation C7H7Br (in 1 term) C7H7Br -- leaving group C7H7BrO (in 1 term) C7H7BrO -- cine-substitution C7H7Cl (in 1 term) C7H7Cl -- common-ion effect (on rates) C7H7NO (in 1 term) C7H7NO -- amides C7H7NS (in 1 term) PhC(=S)NH2 -- thio C7H8 (in 5 terms) C7H8 -- cycloadditionC7H8 -- catalytic hydrogenolysisC7H8 -- hyperconjugationC7H8 -- tropilidenesC7H8 -- catalytic dehydrocyclization C7H8NO (in 1 term) C7H8NO -- nucleophilic catalysis C7H8O (in 1 term) C7H8O -- common-ion effect (on rates) C7H9N (in 1 term) C7H9N -- catalytic hydrogenolysis C7H9NO (in 1 term) C7H9NO -- cine-substitution C7H9NO2S (in 1 term) PhS(=O)2NHCH3 -- sulfonamides C7H9NOS (in 1 term) PhS(=O)NHCH3 -- sulfinamides C8H10S (in 1 term) C8H10S -- leaving group C8H11ClO (in 1 term) C8H11ClO -- α (alpha), β (beta) C8H11NOS (in 1 term) (CH3)2S(=O)=NPh -- sulfoximides C8H12 (in 2 terms) C8H12 -- electrocyclic reactionC8H12 -- propellanes C8H12N (in 1 term) C8H12N -- aminium ions C8H12O5 (in 1 term) C8H12O5 -- tautomerism C8H14 (in 1 term) C8H14 -- planar chirality C8H14O4 (in 1 term) C8H14O4 -- monosaccharides C8H16 (in 3 terms) C8H16 -- tub conformationC8H16 -- crown conformationC8H16 -- extrusion transformation C8H16N2 (in 1 term) C8H16N2 -- extrusion transformation C8H18 (in 1 term) C8H18 -- catalytic hydrogenolysis C8H18O (in 1 term) C8H18O -- zig-zag projection C8H20N (in 1 term) (CH3CH2)4N+ -- onium compounds C8H4O (in 1 term) C8H4O -- heteroarynes C8H5NO (in 1 term) C8H5NO -- cyanides C8H6CrO (in 1 term) [Cr(CO)4(C4H6)] -- η (eta or hapto) in inorganic nomenclature C8H6S2 (in 1 term) C8H6S2 -- isolated double bonds C8H8 (in 6 terms) C8H8 -- chain reactionC8H8 -- non-Kekulé moleculesC8H8 -- chain transferC8H8 -- quinomethanesC8H8 -- alternantC8H8 -- polyhedranes C8H8ClNO (in 1 term) C8H8ClNO -- molecular rearrangement C8H8O4 (in 1 term) C8H8O4 -- polyketides C8H8O4S (in 1 term) C8H8O4S -- acid anhydrides C8H9 (in 1 term) (C8H9+) -- homoaromatic C8H9ClO (in 1 term) PhCH(OH)CH2Cl -- halohydrins C8H9N (in 1 term) PhCH=NMe -- aldimines C8H9NO (in 3 terms) C6H5NHCOCH3 -- transformationC8H9NO -- molecular rearrangementC8H9NO -- anilides C8K (in 1 term) C8K -- intercalation reaction C9H10O (in 1 term) C9H10O -- molecular rearrangement C9H10O2 (in 2 terms) C9H10O2 -- leaving groupC9H10O2 -- catalytic hydrogenolysis C9H12 (in 1 term) C9H12 -- π-adduct C9H12S (in 1 term) (CH3)2S+–C−HPh -- ylides C9H14 (in 1 term) C9H14 -- Bredt's rule C9H14O4 (in 1 term) C9H14O4 -- tautomerism C9H16 (in 1 term) C9H16 -- spiro compounds C9H16O2 (in 1 term) C9H16O2 -- tritactic polymer C9H18O (in 1 term) C9H18O -- Paterno–Büchi reaction C9H19NO4 (in 1 term) C9H19NO4 -- glycosylamines C9H5N (in 1 term) C9H5N -- heteroarynes C9H6O2 (in 2 terms) C9H6O2 -- isocoumarinsC9H6O2 -- coumarins C9H8Cl3 (in 1 term) C9H8Cl3 -- chain transfer C9H8N2 (in 1 term) C9H8N2 -- dipyrrins Ca (in 3 terms) Ca2+ -- interfering substance in electroanalytical chemistryCa2+ -- selectivity coefficientCa2+ -- ionic conductivity CaFeO3 (in 1 term) CaFeO3 -- disproportionation CB (in 2 terms) B–C -- potential-energy (reaction) surfaceBC -- repulsive potential-energy surface CBr4 (in 1 term) CBr4 -- rotator phase transition CBrCl3 (in 1 term) CBrCl3 -- telomerization CCaO3 (in 1 term) CaCO3 -- monotropic transition CCl (in 1 term) C–Cl -- coordination CCl2 (in 2 terms) :CCl2 -- carbenesCCl2 -- α-addition (alpha-addition) CCl2F2 (in 1 term) CF2Cl2 -- background concentration (level) in atmospheric chemistry CCl3 (in 3 terms) Cl3C− -- carbanionCl3C. -- telomerizationCl3C. -- chain transfer CClF3 (in 1 term) CF3Cl -- background concentration (level) in atmospheric chemistry Cd (in 1 term) Cd -- resonance lamp CdHe (in 1 term) HeCd -- ion laser CdHgTe (in 1 term) HgCdTe -- photoconductive detector CdS (in 2 terms) CdS -- pressure-induced transitionCdS -- photoconductive detector CF (in 1 term) C–F -- negative hyper-conjugation CH (in 12 terms) CH -- strain energyCH -- agosticC–H -- symbiosisC–H -- steric isotope effectHC… -- carbynesCH -- bicycle-pedal (BP) mechanismC–H -- hypercoordinationC–H -- persistent–CH= -- dipyrrinsCH -- carbaboranes–CH= -- quinonesC–H -- σ, π (sigma, pi) CH2 (in 14 terms) CH2 -- hypercoordination–CH2– -- pyrromethenesCH2 -- tropylium ionsH2C: -- alkylidenes–CH2– -- hydrocarbylene groupsCH2 -- strain energyH2C -- silyleneCH2 -- insertionH2C: -- carbenesCH2 -- homoconjugation–CH2– -- meso structures in polymersH2C.+ -- carbynium ionsH2C.+ -- carbene radical cationsCH2 -- tropyl radicals CH2Cl (in 1 term) ClCH2– -- organyl groups CH2N2 (in 3 terms) CH2=N2 -- diazo compoundsHN=C=NH -- carbodiimidesCH2=N=N -- isoelectronic CH2Na2O4 (in 1 term) Na2CO3·10H2O -- efflorescence CH2O (in 4 terms) CHOH -- oxo compoundsCHOH -- prochiralityCH2O -- fragmentationCH2O -- smog chamber in atmospheric chemistry CH3 (in 13 terms) CH3 -- allylic intermediatesCH3 -- dimerizationCH3 -- colligationCH3 -- bond-dissociation energyCH3+ -- even-electron ionCH3 -- strain energyCH3 -- fragmentationCH3 -- chain reaction.CH3 -- radical (free radical)CH3 -- benzylic intermediatesCH3(2A'2) -- isogyric reactionCH3 -- abstractionCH3 -- σ, π (sigma, pi) CH3Cl (in 2 terms) CH3Cl -- molecular rearrangementCH3Cl -- substitution reaction CH3ClO2S (in 1 term) CH3ClO2S -- acyl halides CH3F (in 1 term) CH3F -- molecular laser CH3I (in 1 term) CH3I -- identity reaction CH3IMg (in 1 term) MeMgI -- organometallic compounds CH3N (in 2 terms) CH3N: -- carbene analoguesCH3N: -- nitrenes CH3NaS (in 1 term) CH3S−Na+ -- thiolates CH3NO2 (in 2 terms) CH3NO2 -- azinic acidsCH3NO2 -- carbamates CH3NO2S (in 1 term) CH3N=S(=O)2 -- sulfonylamines CH3O (in 3 terms) –CH2OH -- uronic acidsCH3O+ -- oxylium ionsOCH3 -- π-electron acceptor/donor group CH3S (in 4 terms) CH3–S– -- sulfenyl groupsCH3S+ -- sulfenylium ionsMeS– -- organyl groupsCH3S. -- sulfenyl radicals CH4 (in 13 terms) CH4 -- multiply labelledCH4 -- reduced speciesCH4 -- molecular entityCH4 -- stoichiometryCH4 -- bond energy (mean bond energy)CH4 -- composition of pure air in atmospheric chemistryCH4(1A1) -- isogyric reactionCH4 -- isotopologue12CH4+ -- isotope pattern in mass spectrometryCH4 -- spectator mechanismCH4 -- symbiosisCH4 -- bond-dissociation energyCH4 -- abstraction CH4FN (in 1 term) CH4FN -- negative hyper-conjugation CH4N2O (in 1 term) CH4N2O -- isoureas CH4N4 (in 1 term) H2NN=CHN=NH -- formazans CH4O (in 7 terms) CH3OH -- Brønsted acid(CH3OH2+) -- lyonium ionCH4O -- substitution reactionCH4O -- line formulaCH4O -- oxidative couplingCH4O -- α-addition (alpha-addition)CH3OH -- amphiprotic (solvent) CH4O4 (in 1 term) C(OH)4 -- ortho acids CH4Si (in 1 term) H2Si=CH2 -- heteroalkenes CH5 (in 2 terms) CH5+ -- coordination number+CH5 -- alkanium ions CH5B (in 1 term) CH5B -- spectator mechanism CH5N3O (in 1 term) NH2NHC(=O)NH2 -- semicarbazones CH5P (in 1 term) CH3PH2 -- phosphines CHN (in 4 terms) HN+≡C− -- isocyanidesC=NH -- iminesHC≡N -- nitrilesHC≡N -- cyanides CHNO (in 3 terms) HN=C=O -- isocyanatesHC≡N+–O− -- fulminatesHOC≡N -- cyanates CHNS (in 1 term) HSC≡N -- thiocyanates CHNSe (in 1 term) HSeCN -- selenocyanates CHO (in 1 term) –CHO -- characteristic group in organic nomenclature CHO2 (in 2 terms) –COOH -- characteristic group in organic nomenclature–COOH -- polyacid CIN (in 1 term) ICN -- pseudohalogens CKN (in 1 term) KCN -- order-disorder transition CKNO (in 1 term) KOCN -- cyanates Cl (in 20 terms) Cl -- abstractionCl− -- pHCl -- apicophilicity–Cl -- characteristic group in organic nomenclatureCl− -- gas sensing electrodeCl− -- nucleofugeCl -- Herz compoundsCl. -- chain reactionCl− -- Brønsted baseCl -- substitution reactionCl -- excimer lampCl− -- selectivity coefficientCl -- nucleophile (nucleophilic)Cl. -- radical (free radical)Cl -- common-ion effect (on rates)Cl+ -- halonium ionsCl -- ionizationCl− -- gravimetric methodCl -- photolysisCl− -- conjugate acid–base pair Cl2 (in 4 terms) Cl2 -- gas sensing electrodeCl2 -- polarizability2Cl− -- mean activity of an electrolyte in solutionCl2 -- excimer lamp Cl2F (in 1 term) (Cl2F+) -- onium compounds Cl2Zn (in 1 term) ZnCl2 -- activated carbon Cl4Rb2Zn (in 1 term) Rb2ZnCl4 -- commensurate–incommensurate transition ClCs (in 4 terms) CsCl -- thermally-induced transitionCsCl -- structural transitionCsCl -- first-order phase transitionCsCl -- dilational (dilatational) transition ClH (in 9 terms) HCl -- oxoacidsClH -- reaction path degeneracyHCl -- Brønsted acidClH -- isotope exchangeClH -- molecular rearrangementHCl -- levelling effectClH -- abstractionHCl -- internal filling solution of a glass electrodeHCl -- conjugate acid–base pair ClH2 (in 1 term) (H2Cl+) -- onium compounds ClH4N (in 1 term) NH4Cl -- structural transition ClHO (in 1 term) HOCl -- oxoacids ClHO4 (in 1 term) HClO4 -- levelling effect ClK (in 2 terms) KCl -- membrane emfKCl -- Donnan emf (Donnan potential) ClKr (in 1 term) KrCl -- excimer lamp ClLiO4 (in 1 term) LiClO4 -- special salt effect ClNa (in 4 terms) NaCl -- pressure-induced transitionNaCl -- thermally-induced transitionNaCl -- structural transitionNaCl -- first-order phase transition ClXe (in 2 terms) XeCl -- excimer lampXeCl -- excimer laser CN (in 10 terms) CN -- apicophilicityCN− -- interfering substance in electroanalytical chemistry–C≡N -- characteristic group in organic nomenclatureC–N -- lyasesCN− -- prochiralityCN− -- order-disorder transitionCN− -- pseudohalogens–CN -- carbonitrilesC–N -- hydrolasesC–N -- ligases (synthetases) CNNa (in 1 term) NaCN -- cyanides CNNaO (in 1 term) Na+[–C≡N+O−] -- fulminates CNO (in 1 term) –NCO -- characteristic group in organic nomenclature CNS (in 2 terms) N≡C–S− -- organoheteryl groupsSCN− -- pseudohalogens CNS2 (in 1 term) (SCN)2 -- pseudohalogens CO (in 10 terms) C=O -- carbonyl compoundsC=O -- oxo compoundsCO -- photodecarbonylationCO -- isoelectronicCO -- oxocarbonsCO -- air pollutantC–O -- lyasesC–O -- hydrolasesC–O -- ligases (synthetases)–C(=O)– -- quinones Co (in 1 term) Co3+ -- spin-state transition CO2 (in 15 terms) CO2 -- sublimationCO2 -- laserCO2 -- reduced speciesCO2 -- photodecarboxylationCO2 -- photophosphorylationCO2 -- molecular laserCO2 -- composition of pure air in atmospheric chemistryO=C=O -- heterocumulenesCO2 -- acid rain in atmospheric chemistryO=C=O -- oxocarbonsCO2 -- cryogenic samplingCO2 -- sanitary land fillCO2 -- photosynthesisCO2 -- greenhouse effect in atmospheric chemistryCO2 -- carbon dioxide laser (CO2 laser) CoLaO3 (in 1 term) LaCoO3 -- spin-state transition Cr (in 2 terms) Cr3+ -- solid state lasersCr3+ -- ruby laser CS (in 1 term) C–S -- ligases (synthetases) Cu (in 1 term) Cu -- Penning gas mixture CuI (in 1 term) CuI -- chelation CuMn (in 1 term) Cu–Mn -- spin-glass transitionCuZn (in 1 term) CuZn -- second-order transition CY (in 1 term) C–Y -- bisecting conformation (eclipsing conformation) F (in 7 terms) F -- apicophilicityF -- negative hyper-conjugationF -- hydrogen bondF -- excimer lampF -- branching ratioF+ -- halonium ionsF -- hyperconjugation F2P (in 1 term) Fap–P–Fap -- hypervalency F5P (in 2 terms) PF5 -- hypervalencyPF5 -- polytopal rearrangement F5Sb (in 1 term) SbF5 -- superacid F6S (in 1 term) SF6 -- air mass in atmospheric chemistry F6U (in 1 term) UF6 -- gaseous diffusion separator in atmospheric chemistry Fe (in 10 terms) Fe2+ -- Verwey transitionFe -- exchange-inversion transitionFe3+ -- order-disorder transitionFe3+ -- Fenton reaction57Fe -- quadrupole splitting in Mössbauer spectroscopyFe3+ -- equivalent entityFe -- oxidized species57Fe -- nuclear quadrupole moment (spectroscopic)FeII -- spin crossoverFeII -- salt form of an ion exchanger Fe2O3 (in 1 term) α-Fe2O3 -- Morin transitionFe3O4 (in 1 term) Fe3+[Fe3+Fe2+]O4 -- Verwey transition FeLiO2 (in 1 term) LiFeO2 -- order-disorder transition FeMo (in 1 term) Mo–Fe -- spin-glass transitionFeRh (in 1 term) FeRh -- exchange-inversion transition FH (in 4 terms) HF -- molecular laserHF -- superacidHF -- chemical laserHF -- branching ratio FH2 (in 1 term) (H2F+) -- onium compounds FHO3S (in 1 term) HSO3F -- superacid FKr (in 2 terms) KrF -- excimer laserKrF -- liquid ion laser H (in 96 terms) H -- selenidesH -- bismuthinesH+ -- pHH -- selenoxidesH -- oxime O-ethersH+ -- extraction (equilibrium) constantH -- nucleophilic catalysisH -- hydronH -- multiply labelledH+ -- gas sensing electrode2H+ -- deuteriumH+ -- tautomerismH -- hydrogenH -- selonesH+ -- electrofugeH -- urethanes (urethans)H -- extended Hammett equationH -- ketonesH -- ketoximesH -- Schiff bases (Schiff's bases)H -- hemiketalsH -- sulfenyl radicalsH+ -- isoionicH+ -- ligandsH+ -- catalytic coefficientH -- hemiaminalsH -- stibinesH -- telluridesH -- ethers1H -- chemical shift2H -- deuteronH -- thioethersH -- dual substituent-parameter equationH -- azomethinesH -- thioketone S-oxidesH -- pseudo acidsH -- branching chain reactionH -- imines1H -- aromatic3H -- electron capture detector in gas chromatographyH -- alkyl groupsH -- estersH -- sulfenylium ionsH -- trioxidesH -- electrophile (electrophilic)H+ -- protonation constantH -- polysulfanesH -- nitronesH -- selenolsH+ -- Rutherford backscattering (RBS)H -- sulfenic acidsH+ -- specific acid–base catalysisH -- thioketonesH -- diazoamino compoundsH -- bond energy (mean bond energy)H -- sulfenamidesH -- bond-dissociation energyH+ -- equivalent entityH -- siliconesH -- gas-phase acidityH -- sulfenyl groupsH -- Hammett equation (Hammett relation)H -- sulfoxidesH -- gas-phase basicityH -- polysulfidesH -- hydrazidesH -- enolsH -- alkoxyaminesH -- ortho estersH -- phosphines3H− -- tritiumH+ -- protiumH -- acetalsH -- selenenic acidsH+ -- Haber–Weiss reactionH -- arsinesH -- reaction path degeneracyH -- thiohemiacetalsH -- ketalsH -- fragmentationH -- thioacetalsH -- sulfonesH(2S) -- isogyric reactionH -- thiolsH -- addition reactionH -- spin polarizationH -- hemiacetalsH -- Brønsted relationH -- ketiminesH+ -- standard hydrogen electrodeH -- sulfidesH -- common-ion effect (on rates)H -- hyperconjugationH+ -- leaving groupH+ -- general acid–base catalysisH -- carbene analogues H10N2Si3 (in 1 term) H3SiNHSiH2NHSiH3 -- silazanes H2 (in 5 terms) H2 -- pHH2 -- gas sensing electrodeH2 -- catalytic hydrogenolysisH2(1Σ+g) -- isogyric reactionH2 -- standard hydrogen electrode H2I (in 1 term) (H2I+) -- onium compounds H2KN (in 1 term) H2KN -- isotopic scrambling H2N (in 5 terms) NH2 -- amides–NH2 -- characteristic group in organic nomenclatureNH2 -- phosphoglyceridesH2N. -- aminyl radicals(H2N:+) -- nitrenium ions H2N2 (in 5 terms) =NNH2 -- hydrazidinesH2NN: -- carbene analogues–NHNH– -- hydrazo compounds=NNH2 -- hydrazonesHN=NH -- azo compounds H2N2O (in 1 term) H2NNO -- nitrosamides H2N2O2 (in 1 term) O2NNH2 -- nitramines H2N2S (in 1 term) HN=S=NH -- sulfur diimides H2NO (in 3 terms) H2N–O− -- aminoxidesH2N–O. -- nitroxides–NHOH -- hydroxamic acids H2NP (in 1 term) HP=NH -- phosphazenes H2O (in 19 terms) H2O -- oxenium ionsH2O -- common-ion effect (on rates)H2O -- ionizationH2O -- composition of pure air in atmospheric chemistryH2O -- temperature lapse rate in atmospheric chemistryH2O -- Brønsted acidH2O -- supersaturationH2O -- Brønsted baseH2O -- oxidative couplingH2O -- nucleophilic catalysisH2O -- anhydro basesH2O -- hydrationH2O -- branching chain reactionH2O -- pre-equilibrium (prior equilibrium)H2O -- gaseous diffusion separator in atmospheric chemistryH2O -- Haber–Weiss reactionH2O -- sanitary land fillH2O -- photosynthesisH2O -- amphiprotic (solvent) H2O2 (in 5 terms) HOOH -- hydroperoxidesH2O2 -- Fenton reactionH2O2 -- oxidation stateH2O2 -- Haber–Weiss reactionH2O2 -- smog chamber in atmospheric chemistry H2O2S (in 2 terms) HOSOH -- oxoacidsHS(=O)OH -- sulfinic acids H2O3 (in 1 term) HOOOH -- trioxides H2O3P (in 4 terms) –PO3H2 -- characteristic group in organic nomenclature–P(=O)(OH)2 -- phospho–P(=O)(OH)2 -- phosphono–PO3H2 -- polyacid H2O3S (in 1 term) HS(=O)2OH -- sulfonic acids H2O4S (in 7 terms) (HO)2SO2 -- oxoacidsH2SO4 -- reduced speciesH2SO4 -- Brønsted acidH2SO4 -- equivalent entityH2SO4 -- oxidation stateH2SO4 -- haze in atmospheric chemistryH2SO4 -- amphoteric H2S (in 11 terms) H2S -- hydrocracking unitH2S -- reduced speciesSH2 -- bonding numberH2S -- sulfenylium ionsH2S -- acid-labile sulfurH2S -- oxidized speciesH2S -- sulfenyl groupsH2S -- sulfenyl radicalsH2S -- oxidation stateH2S -- sulfanesH2S -- air pollutant H2S2 (in 1 term) HS2H -- polysulfanes H2Se (in 1 term) H2Se -- selenides H2Si (in 1 term) H2Si -- silylene H2Te (in 1 term) H2Te -- tellurides H3N (in 5 terms) H3N.+ -- ammoniumyl radical ionsH3N -- aminiumyl radical ionsNH3 -- Brønsted acidNH3 -- Rydberg stateH3N -- tele-substitution H3N2 (in 2 terms) –NHNH2 -- hydrazidinesH2NN.H -- verdazyl radicals H3N3 (in 1 term) NH2N=NH -- triazenes H3NO (in 1 term) H2N–OH -- hydroxylamines H3NO2 (in 1 term) H3NO2 -- azinic acids H3NO3 (in 1 term) H3NO3 -- azonic acids H3NO3S (in 1 term) H2NS(=O)2OH -- sulfamic acids H3NS (in 1 term) H2S=NH -- sulfimides H3O (in 4 terms) H3O+ -- oxonium ionsH3O -- ionizationH3O+ -- Brønsted acid(H3O+) -- onium compounds H3O2P (in 2 terms) HP(OH)2 -- phosphonous acidsH2P(=O)OH -- phosphinic acids H3O3P (in 2 terms) P(OH)3 -- oxoacidsHP(=O)(OH)2 -- phosphonic acids H3O4P (in 1 term) H3PO4 -- electrolytic hygrometer H3OP (in 1 term) H2POH -- phosphinous acids H3P (in 2 terms) PH3 -- phosphinesPH3 -- phosphanes H3S (in 1 term) (H3S+) -- onium compounds H3Sb (in 2 terms) SbH3 -- stibanesSbH3 -- stibines H3Se (in 1 term) (H3Se+) -- onium compounds H3Si (in 2 terms) H3Si– -- silyl groupsH3Si. -- silyl radicals H3Sn (in 1 term) .SnH3 -- radical (free radical) H3Te (in 1 term) (H3Te+) -- onium compounds H4N (in 1 term) (H4N+) -- onium compounds H4N2 (in 1 term) H2NNH2 -- hydrazines H4NP (in 1 term) H3P=NH -- phosphazenes H4NY (in 1 term) (NH4+)Y− -- quaternary ammonium compounds H4OSi (in 1 term) H3SiOH -- silanols H4P (in 1 term) (H4P+) -- onium compounds H4Sb (in 1 term) (H4Sb+) -- onium compounds H5N3 (in 1 term) NH2NHNH2 -- triazanes H5NO4S (in 1 term) NH4HSO4 -- haze in atmospheric chemistry H5P (in 1 term) PH5 -- phosphoranes H6S (in 1 term) SH6 -- bonding number He (in 4 terms) 3He -- helionHe -- atomic laserHe+ -- Rutherford backscattering (RBS)4He -- α-particle (alpha-particle) Hg (in 1 term) Hg -- resonance lamp HI (in 1 term) HI -- levelling effect HLi (in 2 terms) HLi -- topochemical reactionLiH -- oxidation state HN (in 7 terms) –NH -- anion exchangerHN: -- carbene analoguesHN: -- nitrenesNH -- silasesquiazanes–NH– -- silazanesHN -- Lewis acidHN= -- imino acids HN3 (in 2 terms) –N=N–NH– -- aziminesHN3 -- azides HNO (in 1 term) =NOH -- hydroximic acids HNO2 (in 2 terms) HON=O -- oxoacidsHONO -- smog chamber in atmospheric chemistry HNO3 (in 1 term) HNO3 -- smog chamber in atmospheric chemistry HO (in 36 terms) OH– -- anion exchangerOH− -- general acid–base catalysis–OH -- vinylic groups–OH -- hydrazidinesHO -- allylic substitution reaction–OH -- characteristic group in organic nomenclatureOH -- erythro structures in a polymerOH− -- isoionicHO -- substitution reactionOH− -- catalytic coefficient–OH -- benzylic groupsOH -- phosphoglyceridesOH. -- Fenton reactionOH -- phosphoramidesHO -- anhydro basesOH -- oxo compounds–OH -- cresolsOH− -- kinetic equivalenceOH− -- specific acid–base catalysisHO -- pre-equilibrium (prior equilibrium)–OH -- allylic groupsHO+ -- oxylium ionsOH -- anilidesOH− -- Brønsted base–OH -- sulfenamidesHO -- decay rate in atmospheric chemistry–OH -- hydrazides–OH -- alcohols–OH -- hydroxamic acidsHO -- molecular rearrangementHO+ -- acyl speciesOH− -- Haber–Weiss reactionHO -- colligationOH -- branching chain reactionHO -- smog chamber in atmospheric chemistry–OH -- peroxy acids HO2 (in 1 term) –OOH -- peroxy acids HO3S (in 2 terms) –SO3H -- characteristic group in organic nomenclature–SO3H -- polyacid HO4S (in 2 terms) HSO4− -- Brønsted acidHSO4− -- Brønsted base HSi (in 2 terms) Si–H -- agosticSiH -- silasesquiazanes I (in 5 terms) I− -- identity reaction129I -- nuclear quadrupole moment (spectroscopic)123I -- radioiodinationI -- excimer lampI+ -- halonium ions I2 (in 2 terms) I2 -- dopantI2 -- excimer lamp IK (in 1 term) IK -- isotopic scrambling IO2 (in 1 term) IO2 -- characteristic group in organic nomenclature IXe (in 1 term) XeI -- excimer lamp K (in 1 term) K -- syntectic reaction KMnO4 (in 1 term) KMnO4 -- equivalent entity Kr (in 3 terms) Kr -- excimer lampKr -- resonance lampKr -- liquid ion laser Kr2 (in 1 term) Kr2 -- excimer lamp KZn (in 1 term) K-Zn -- syntectic reactionKZn13 (in 1 term) KZn13 -- syntectic reaction La (in 1 term) La3+ -- ionic conductivity Li (in 1 term) Li+ -- order-disorder transition LiMn2O4 (in 1 term) Li[Mn2]O4 -- topochemical reaction Mg (in 2 terms) Mg -- solute-volatilization interference in flame spectroscopyMg2+ -- selectivity coefficient Mg2O4Si (in 1 term) Mg2SiO4 -- reconstructive transition Mn3O4 (in 1 term) Mn3O4 -- Jahn–Teller transition MnO2 (in 1 term) MnO2 -- magnetic transition N (in 9 terms) N -- imidesN -- hydrogen bond in theoretical organic chemistryN -- dipolar compoundsN -- hydrogen bondN -- umpolung≡N -- nitrilesN -- amidium ionsN -- alkoxyaminesN -- spin crossover N2 (in 8 terms) N2 -- reference procedure in analysis of trace air constituentsN2 -- cage=N+=N− -- diazo compoundsN2 -- molecular laserN2 -- photochemical nitrogen extrusionN2 -- isoelectronicN2 -- cryogenic samplingN2 -- geminate recombination N2O (in 1 term) N2O -- local fraction atomized N3 (in 3 terms) –N=N+=N− -- azidesN3− -- pseudohalogens–N3 -- quinone diazides N3Na (in 1 term) NaN3 -- azides Na (in 4 terms) Na+ -- mean activity of an electrolyte in solutionNa+ -- interfering substance in electroanalytical chemistryNa -- resonance lampNa+ -- ionic conductivity Nb3Sn (in 1 term) Nb3Sn -- superconducting transition Ne (in 3 terms) Ne -- helium–neon laserNe -- atomic laserNe -- excimer lamp Ni (in 1 term) 63Ni -- electron capture detector in gas chromatography NiS (in 1 term) NiS -- dilational (dilatational) transition NO (in 7 terms) NO -- reference procedure in analysis of trace air constituents–NO -- nitroso compoundsNO -- emission in atmospheric chemistryNO -- composition of pure air in atmospheric chemistry–N=O -- isonitroso compoundsNO+ -- isoelectronicNO -- primary pollutant in atmospheric chemistry NO2 (in 8 terms) NO2 -- reference procedure in analysis of trace air constituentsNO2+ -- electrofuge–NO2 -- nitro compoundsNO2 -- π-electron acceptor/donor groupNO2 -- composition of pure air in atmospheric chemistryNO2 -- permeation tubeNO2 -- air pollutantNO2 -- electrophile (electrophilic) NO3 (in 2 terms) NO3− -- mean activity of an electrolyte in solutionNO3 -- oxidant in atmospheric chemistry NO3Rb (in 1 term) RbNO3 -- thermally-induced transition O (in 20 terms) O -- imides=O -- hydrazidines–O– -- silathianes=O -- characteristic group in organic nomenclature–O– -- imidinesO2− -- ligands=O -- hydroximic acidsO -- dipolar compoundsO -- hydrogen bondO -- tautomerism=O -- diamididesO -- hydrogen bond in theoretical organic chemistry–O– -- silazanes=O -- oxo compoundsO -- umpolungO -- ylidesO -- amidium ions=O -- hydrazones=O -- imidic acidsO -- branching chain reaction O2 (in 14 terms) O2 -- biochemical (biological) oxygen demand(=O)2 -- sulfonediiminesO2 -- singlet molecular oxygen (singlet molecular dioxygen)O2 -- spin-statistical factor (in diffusion-controlled reactions)O2 -- flow rate in flame emission and absorption spectrometryO2 -- mean free pathO22− -- peroxidesO2 -- catalaseO2 -- chemical oxygen demand (COD)O2 -- chemical bondO2 -- Schenck-sensitization mechanismO2 -- Haber–Weiss reactionO2 -- photosynthesisO2 -- configuration (electronic) O2S (in 10 terms) SO2 -- oxidized speciesSO2 -- extraction (equilibrium) constantSO2 -- emission in atmospheric chemistryO2S -- cheletropic reactionSO2 -- primary pollutant in atmospheric chemistrySO2 -- oxidation stateSO2 -- permeation tubeSO2 -- composition of pure air in atmospheric chemistrySO2 -- sink in atmospheric chemistrySO2 -- air pollutant O2Si (in 2 terms) SiO2 -- polymorphic transitionSiO2 -- displacive transition O2Ti (in 1 term) TiO2 -- irreversible transition O2V (in 1 term) VO2 -- metal–insulator transition O2Zr (in 1 term) ZrO2 -- martensitic transition O3 (in 4 terms) O3 -- reference procedure in analysis of trace air constituentsO3 -- secondary pollution (emissions)O3 -- decay rate in atmospheric chemistryO3 -- greenhouse effect in atmospheric chemistry O3S (in 3 terms) SO3 -- oxidized speciesSO3 -- oxidation state–(SO3−) -- membrane sites in an ion-selective electrode O3Ti2 (in 1 term) Ti2O3 -- semiconductor-metal transition O4 (in 1 term) O4 -- chemical bond O4S (in 2 terms) SO42− -- Brønsted baseSO42− -- selectivity coefficient O4S3 (in 1 term) 3SO42− -- mean activity of an electrolyte in solution O4Si (in 1 term) SiO4 -- displacive transition O5P2 (in 1 term) P2O5 -- electrolytic hygrometer O5V2 (in 1 term) V2O5 -- gel OP (in 1 term) P–O -- ligases (synthetases) P (in 2 terms) P -- imidesP -- umpolung PbS (in 1 term) PbS -- photoconductive detector Pt (in 2 terms) Pt -- pHPt -- gas sensing electrode S (in 10 terms) S -- polytypic transitionS -- imidesS -- tautomerismS -- mustards–S– -- silathianesS -- hydrogen bond in theoretical organic chemistryS -- umpolungS -- ylidesS -- poison in catalysisS -- triple point S2 (in 1 term) S2 -- polysulfanes S2Ti (in 1 term) TiS2 -- intercalation reaction S8 (in 1 term) S8 -- oxidation state Se (in 3 terms) Se -- imidesSe -- umpolungSe -- ylides Si (in 3 terms) Si -- di-π-silane rearrangementSi -- silanolsSi -- photoconductive detector SiV3 (in 1 term) V3Si -- superconducting transition Sn (in 2 terms) 119Sn -- nuclear quadrupole moment (spectroscopic)119Sn -- quadrupole splitting in Mössbauer spectroscopy SZn (in 1 term) ZnS -- polytypic transition Te (in 2 terms) Te -- imidesTe -- ylides Ti (in 1 term) Ti3+ -- solid state lasers U (in 1 term) 239U -- resonance neutrons Xe (in 2 terms) Xe -- excimer lampXe -- resonance lamp Xe2 (in 1 term) Xe2 -- excimer lamp Zn (in 3 terms) Zn -- polytypic transitionZn -- syntectic reactionZn -- resonance lamp
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DOI: 10.1351/goldbook Jan Kaiser - Content Editor Stuart Chalk - Technical Editor Joint Subcommitteeon the IUPAC Gold BookExact Chemical Formulae
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