| 'R–C≡C+ | umpolung |
| +R | cross-conjugation |
| +R | cross-conjugation |
| -R | cross-conjugation |
| -R | cross-conjugation |
| .− | radical ion |
| .+ | radical ion |
| [M2]+. | dimeric ion in mass spectrometry |
| –CR2–CH2–CR2– | meso structures in polymers |
| –CR2–CR2O– | crown |
| –CR2H | isonitroso compounds |
| –CnH2n+1 | alkyl groups |
| –N=CR2 | nitrile ylides |
| –[CH2]n– | cyclophanes |
| –NR– | diamidides |
| –NR– | imidines |
| –NRNR2 | hydrazides |
| –NR2 | sulfenamides |
| [–OSiR2–]n | silicones |
| =NNR2 | hydrazonic acids |
| =NOR | hydroximic acids |
| =NR | diamidides |
| =NR | imidines |
| =NR | quinonimines (quinone imines) |
| =NR | imidic acids |
| =NR | amidines |
| (=NR)2 | sulfonediimines |
| (XC2H2C2H2)2NR | mustards |
| (XC2H2C2H2)2S | mustards |
| A | kinetic isotope effect |
| A | electron-transfer catalysis |
| A | heterolytic dissociative adsorption |
| A | light-atom anomaly |
| A | light-atom anomaly |
| A | repulsive potential-energy surface |
| A | kinetic isotope effect |
| A | isotopic fractionation factor |
| A | heterolytic dissociative adsorption |
| A | homolytic dissociative adsorption |
| A | potential-energy (reaction) surface |
| A | catalytic hydrogenolysis |
| A | dimerization |
| A | kinetic isotope effect |
| A | Brønsted relation |
| A | atom–molecule complex mechanism |
| A− | homoconjugation |
| A− | heteroconjugation |
| A− | Brønsted relation |
| A− | Brønsted relation |
| A. | heterolytic bond-dissociation energy |
| A+ | heterolytic bond-dissociation energy |
| A+ | heterolytic bond-dissociation energy |
| A–B | repulsive potential-energy surface |
| A–B | light-atom anomaly |
| A–B | repulsive potential-energy surface |
| A–B | potential-energy (reaction) surface |
| A–B | light-atom anomaly |
| A–B | heterolytic bond-dissociation energy |
| abC=Cc2 | pro-E, pro-Z |
| [(CH)a(BH)mHb]c | carbaboranes |
| AH | homoconjugation |
| AM | atom–molecule complex mechanism |
| A'H | heteroconjugation |
| A1-xBx | chemical diffusion |
| A+. | electron-transfer catalysis |
| A2 | atom–molecule complex mechanism |
| A2 | dimerization |
| abC=C=Ccd | chirality axis |
| AcO− | ligands |
| ArCR2– | benzylic groups |
| ArNRNRAr | hydrazo compounds |
| AsR3 | arsenides |
| AsnHn+2 | arsanes |
| B | isotopic fractionation factor |
| B | ionic conductivity |
| B | heterolytic dissociative adsorption |
| B | electron-transfer catalysis |
| B | homoconjugation |
| B | catalytic hydrogenolysis |
| B | conjugate acid–base pair |
| B | heterolytic dissociative adsorption |
| B | conjugate acid–base pair |
| B | ionic conductivity |
| B | conjugate acid–base pair |
| B | homolytic dissociative adsorption |
| B | ionic conductivity |
| B | light-atom anomaly |
| B− | heterolytic bond-dissociation energy |
| B− | heterolytic bond-dissociation energy |
| B. | heterolytic bond-dissociation energy |
| BC | light-atom anomaly |
| BH+ | conjugate acid–base pair |
| BH+ | conjugate acid–base pair |
| B' | heteroconjugation |
| B+. | electron-transfer catalysis |
| BinHn+2 | bismuthanes |
| BuLi | organometallic compounds |
| C | light-atom anomaly |
| C | light-atom anomaly |
| C | light-atom anomaly |
| c | pro-R, pro-S |
| c | pro-R, pro-S |
| c | pro-R, pro-S |
| C–D | steric isotope effect |
| C–R | bisecting conformation (eclipsing conformation) |
| C=X | bisecting conformation (eclipsing conformation) |
| C6H5Z | partial rate factor |
| C6H5Z | partial rate factor |
| C6H5Z | partial rate factor |
| Cabcd | chirality centre |
| CH2D2 | principal ion in mass spectrometry |
| CHDTCO2H | prochirality |
| CHX3 | haloforms |
| CH2D+ | isotopic ion |
| CH2DCH=O | isotopomer |
| CH2DCO2H | prochirality |
| CH2D2 | isotopologue |
| CH3CD=O | isotopomer |
| CH3CH=CHD | isotopomer |
| CH3CHDOH | isotopomer |
| CH3CHDOH | prochirality |
| CH3CHOHCHDCH3 | prochirality |
| CH3D | isotopologue |
| CH3(CH2)nCO2−M+ | amphiphilic |
| CH3(CH2)nN+(CH3)3X− | amphiphilic |
| CH3(CH2)nSO3−M+ | amphiphilic |
| C(OR')4 | ortho esters |
| C2H4DBr+. | isotopic molecular ion |
| C5n | terpenes |
| CaCl2.nROH | alcoholates |
| Ce | symmetry-conserving transition |
| Cl3C[CH2CHPh]nBr | telomerization |
| CnH2n | alkenes |
| CnH2n+2 | alkanes |
| CnH2n-2 | alkynes |
| CnHn | annulenes |
| CnHn+1 | annulenes |
| Cn(H2O)n | carbohydrates |
| DF | molecular laser |
| DF | branching ratio |
| DF | chemical laser |
| D2O | chemical shift,  in NMR |
| D2O | gaseous diffusion separator
in atmospheric chemistry |
| D2O | heavy water |
| Er3+ | solid state lasers |
| GY | cross-conjugation |
| GY | cross-conjugation |
| GdFeO3 | magnetic transition |
| GY | cross-conjugation |
| H–[CHOH]n–C(=O)[CHOH]m–H | ketoses |
| H–[CH2–C(CH3)=CH–CH2]n–OH | dolichols |
| H–[CH2–C(CH3)=CH–CH2]n–OH | polyprenols |
| H–[CH2C(Me)=CHCH2]nOH | prenols |
| HA | general acid catalysis |
| HA | Brønsted relation |
| HA | Brønsted relation |
| HA | Brønsted relation |
| HB+ | homoconjugation |
| H[CH(OH)]nC(=O)H | aldoses |
| HD | branching ratio |
| HDO | heavy water |
| HDO | gaseous diffusion separator
in atmospheric chemistry |
| HL | extraction (equilibrium) constant |
| HL | extraction (equilibrium) constant |
| HL | extraction (equilibrium) constant |
| HLaq | extraction (equilibrium) constant |
| H(CH2)n | alkyl groups |
| HnL | protonation constant |
| (HO)2P(=O)(OR) | esters |
| [HOC(=NH2)NH2]+X− | uronium salts |
| HOC(=O)[CH(OH)]nC(=O)OH | aldaric acids |
| HOCH2[CH(OH)]nC(=O)OH | aldonic acids |
| HOCH2[CH(OH)]nCH2OH | alditols |
| HOCR'=CR2 | enols |
| HON=C{[CH2]n}2C=NOH | E, Z |
| HSnH | polysulfanes |
| HTO | gaseous diffusion separator
in atmospheric chemistry |
| H3Si[OSiH2]nOSiH[OSiH2OSiH3]2 | siloxanes |
| H3Si[OSiH2]nOSiH3 | siloxanes |
| H3Si[SSiH2]nSSiH3 | silathianes |
| H3Sn[OSnH2]nOSnH3 | stannoxanes |
| L | formation constant |
| L | protonation constant |
| L | protonation constant |
| l' | syntectic reaction |
| l'' | syntectic reaction |
| M | alkoxides |
| M | protonated molecule in mass spectrometry |
| M | dimeric ion in mass spectrometry |
| M | sialon |
| M | formation constant |
| M | atom–molecule complex mechanism |
| M–Si–Al–O–N | sialon |
| [M + H]+ | protonated molecule in mass spectrometry |
| MH+ | protonated molecule in mass spectrometry |
| MH+ | protonated molecule in mass spectrometry |
| MLn | extraction (equilibrium) constant |
| MLn | formation constant |
| MLn | extraction (equilibrium) constant |
| Mn | extraction (equilibrium) constant |
| Mn | extraction (equilibrium) constant |
| M− | charge-transfer reaction in mass spectrometry |
| M+ | charge-transfer reaction in mass spectrometry |
| M2+ | charge-transfer reaction in mass spectrometry |
| MgX2 | Grignard reagents |
| N+abcd | chirality centre |
| (CH)n | polyhedranes |
| NHR | amides |
| [(H2O)nH]+ | cluster ion in mass spectrometry |
| NR | imines |
| NR2 | glycosylamines |
| NR2 | amides |
| Nd3+ | neodymium laser |
| Nd3+ | neodymium laser |
| Nd3+ | solid state lasers |
| NnHn+2 | azanes |
| NR | ylides |
| O=NN=CR2 | nitrosimines |
| O−–Z–O. | semiquinones |
| O2NN=CR2 | nitrimines |
| P(=O)(NR2)3 | phosphoramides |
| P(=O)(OH)2(NR2) | phosphoramides |
| P(=O)(OH)(NR2)2 | phosphoramides |
| Pabc | chirality centre |
| PhX | selectivity factor,
|
| PhX | selectivity factor,
|
| PnHn+2 | phosphanes |
| R | ketoximes |
| R | diazoamino compounds |
| R | steric effect |
| R | hydroperoxides |
| R | alkoxides |
| R | selenols |
| R | ketones |
| R | bismuthines |
| R | selenoxides |
| R | hydrazides |
| R | thioethers |
| R | sulfenylium ions |
| R | sulfoxides |
| R | selenenic acids |
| R | thioketones |
| R | diazoates |
| R | bisecting conformation (eclipsing conformation) |
| R | ketals |
| R | diazoamino compounds |
| R | thioacetals |
| R | esters |
| R | polysulfides |
| R | sulfenyl groups |
| R | carbene analogues |
| R | selones |
| R | sulfenyl radicals |
| R | ketimines |
| R | thioacetals |
| R | silicones |
| R | sulfenic acids |
| R | azomethines |
| R | arsines |
| R | sulfenamides |
| R | bisecting conformation (eclipsing conformation) |
| R | imines |
| R | phosphines |
| R | thiols |
| R | bisecting conformation (eclipsing conformation) |
| R | hemiaminals |
| R | alkyl groups |
| R | ethers |
| R | sulfones |
| R | diazoamino compounds |
| R | tellurides |
| R | aldehydes |
| R | selenides |
| R | hemiketals |
| R | alkyl groups |
| R | thioketone S-oxides |
| R | sulfides |
| R | hydropolysulfides |
| R | stibines |
| R | azomethines |
| R | steric effect |
| R | hydroperoxides |
| R− | common-ion effect (on rates) |
| R+ | ion pair return |
| R+ | common-ion effect (on rates) |
| R+ | attachment |
| R–As | arsanylidenes |
| R–C–R | bisecting conformation (eclipsing conformation) |
| R–C≡CX | umpolung |
| R–C≡C− | umpolung |
| R–C≡N+–Y− | nitrilium betaines |
| R–C:–CH2C(=NR)R | imino carbenes |
| R–NCO | esters |
| R–[S]n–R | polysulfides |
| R2C=N+R2Y− | quaternary ammonium compounds |
| R2CMLn | metal–carbene complexes |
| R2C(OR)2 | ketals |
| RAs: | carbene analogues |
| RAsH2 | arsines |
| RB: | carbene analogues |
| RB(OH)2 | boronic acids |
| RB: | boranylidenes |
| RBiH2 | bismuthines |
| RC(=NH)– | imidoyl carbenes |
| RC(=NOH)NO | nitrosolic acids |
| RC(=NOH)NO2 | nitrolic acids |
| RC(=NR)C:–R | imidoyl carbenes |
| RC(=NR)NRC(=NR)R | diamidides |
| RC(=NR)(OH) | imidic acids |
| [RC(=O)]2NR | diacylamines |
| RC(=O)H | aldehydes |
| RC(=O)NHNH2 | hydrazides |
| RC(=O)NHOH | hydroxamic acids |
| RC(=O)OH | oxoacids |
| RC(=S=O)H | thioaldehyde S-oxides |
| RC(=S)H | thioaldehydes |
| RC(=O)SH | thiocarboxylic acids |
| RC(=S)OH | thiocarboxylic acids |
| RC(=S)SH | thiocarboxylic acids |
| RC≡ | hydrocarbylidyne groups |
| RC≡CH | acetylides |
| RC≡CNR2 | ynamines |
| RC≡COH | ynols |
| RC≡CR | alkynes |
| RC≡N | nitriles |
| RC≡N | carbonitriles |
| RC≡NH+ | onium compounds |
| RC≡N+–C−R2 | ylides |
| RC≡N+N−–R | ylides |
| RC≡O+ | onium compounds |
| RCH=C=O | ynols |
| RCH=NN=CHR | aldazines |
| RCH=NOH | aldoximes |
| RCH=NR | aldimines |
| RCH=NR | imines |
| RCMLn | metal–carbyne complexes |
| RC(NHNH2)2=NNH2 | hydrazidines |
| RC(NH2)3 | ortho amides |
| RC(OH)=C(OH)C(=O)R | reductones |
| RC(OH)=NNH2 | hydrazonic acids |
| RC(OH)=NOH | hydroximic acids |
| RC(OH)3 | ortho acids |
| RC(OR')3 | ortho esters |
| RMgX | Grignard reagents |
| RN2− | imides |
| RN+≡C− | isocyanides |
| RN+≡N | diazonium salts |
| RN: | carbene analogues |
| RN= | imino carbenes |
| RN= | imides |
| RN: | amine imides |
| RN=C=O | isocyanates |
| RN=C=S | isothiocyanates |
| RN=C=S | mustard oils |
| RN=C=Se | isoselenocyanates |
| RN=CR2 | imines |
| RN=N+ | diazonium salts |
| RN=N. | diazenyl radicals |
| RN=N–NR2 | diazoamino compounds |
| RN=NNHR' | diazoamino compounds |
| RN=NOH | diazoates |
| RN=NO−M+ | diazoates |
| RN=NO−M+ | diazoates |
| RN=S=O | sulfinylamines |
| RN=S(=O)2 | sulfonylamines |
| RN=S(=O)2 | sulfimides |
| RNC | isocyanides |
| RNHNO | nitrosamines |
| RN2+Y− | diazonium salts |
| RO– | glycosides |
| RO–NO | Barton reaction |
| ROC(=S)SH | xanthic acids |
| ROCN | esters |
| ROH | alkoxides |
| ROM | alkoxides |
| RON=C: | fulminates |
| ROOH | hydroperoxides |
| ROOOR' | trioxides |
| ROOR | peroxides |
| ROR | ethers |
| RO+ | oxenium ions |
| RO+ | oxylium ions |
| RP: | carbene analogues |
| RP(=O)(NHNH2)2 | hydrazides |
| RP(=O)(OH)2 | oxoacids |
| RPH2 | phosphines |
| RP: | phosphanylidenes |
| RS– | sulfenyl groups |
| RS– | glycosides |
| RS(=NH)2(OH) | imidic acids |
| RS(=NH)2=NH2 | sulfonamidines |
| RS(=NR)2R | sulfonediimines |
| RS(=NR)NR2 | sulfinamidines |
| RS(=O)2NHC(=O)R | diacylamines |
| RS(=O)2NHNH2 | hydrazides |
| RS(=O)=NH2 | sulfonamidines |
| RS(=O)(=NNH2)OH | hydrazonic acids |
| RS(=O)(=NOH)OH | hydroximic acids |
| RS(=O)2NR'2 | sulfonamides |
| RS(=O)2OS(=O)2R' | sulfonic anhydrides |
| RS(=O)2R | sulfones |
| RS(=O)NR2 | sulfinamides |
| RS(=O)OH | sulfinamides |
| RS(=O)OH | sulfinamidines |
| RS(=O)OS(=O)R | sulfinic anhydrides |
| RSH | thiols |
| RSOH | sulfenamides |
| RSOH | sulfenic acids |
| RSOH | amides |
| RSR | thioethers |
| RS. | sulfenyl radicals |
| RS+ | sulfenylium ions |
| RS2H | hydropolysulfides |
| RS2R | polysulfides |
| RS3H | hydropolysulfides |
| RSb: | carbene analogues |
| RSb: | stibanylidenes |
| RSbH2 | stibines |
| RSe– | glycosides |
| RSe(=O)2OH | selenonic acids |
| RSe(=O)OH | seleninic acids |
| RSeH | selenols |
| RSeOH | selenenic acids |
| RSeR | selenides |
| RSnH | hydropolysulfides |
| RTeR | tellurides |
| RX | common-ion effect (on rates) |
| RY | steric effect |
| R' | acetals |
| R' | acetals |
| R' | diazoamino compounds |
| R' | carbamates |
| R' | ortho esters |
| R' | enols |
| R' | nitrones |
| R' | enols |
| R' | hemiacetals |
| R' | Schiff bases (Schiff's bases) |
| R' | acetals |
| R' | thiohemiacetals |
| R' | imines |
| R' | thioacetals |
| R' | oxime O-ethers |
| R' | alkoxyamines |
| R' | urethanes (urethans) |
| R' | acetals |
| R' | trioxides |
| R' | ortho esters |
| R'C(=O)(OR) | esters |
| R'C(=O)(SR) | esters |
| R'C(=S)(OR) | esters |
| (R'S)2C(=O) | esters |
| R'S(=O)2(OR) | esters |
| R'2C=NR | imines |
| R1 | E, Z |
| R1 | E, Z |
| R1 | E, Z |
| R1COOR2 | moiety |
| R1R2C(=C=C)n=CR3R4 | E, Z |
| R1R2C=CR3R4 | E, Z |
| R1R2C=NOH | E, Z |
| R1. | α-cleavage (alpha-cleavage) |
| R1. | α-cleavage (alpha-cleavage) |
| R2 | E, Z |
| R2 | E, Z |
| R2 | E, Z |
| R2AsH | arsines |
| R2BOH | borinic acids |
| R2BiH | bismuthines |
| R2C−–O. | ketyls |
| R2C.+ | carbene radical cations |
| R2C.–O− | ketyls |
| R2C.–OH | ketyls |
| R2C= | hydrocarbylidene groups |
| R2C: | alkylidenes |
| R2C=C=C=CR2 | cumulenes |
| R2C=C=CR2 | allenes |
| R2C=C=NR | ketenimines |
| R2C=C=O | ketenes |
| R2C=CRC:R | vinyl carbenes |
| R2C=C+–R | vinylic cations |
| R2C=C: | vinylidenes |
| R2C=N+ | iminylium ions |
| R2C=N. | iminyl radicals |
| R2C=N–O. | iminooxy (iminoxy) radicals |
| R2C=N+R2 | iminium compounds |
| R2C=NNHC(=O)C(=O)NH2 | semioxamazones |
| R2C=NNHC(=O)NH2 | semicarbazones |
| R2C=NNR2 | hydrazones |
| R2C=NOH | ketoximes |
| R2C=NOH | oximes |
| R2C=NOR' | oxime O-ethers |
| R2C=NR' | ketimines |
| R2C=NR' | Schiff bases (Schiff's bases) |
| R2C=N+H2X− | onium compounds |
| R2C=N+(O−)H | nitrones |
| R2C=N+(O−)R' | nitrones |
| R2C=N+R–C−R2 | ylides |
| (R2C=N:+) | nitrenium ions |
| R2C=O | ketones |
| R2C=O+–Y− | oxonium ylides |
| R2C=S | thioketones |
| R2C=S=O | thioketone S-oxides |
| R2C=SO2 | sulfenes |
| R2C=Se | selones |
| R2C… | alkylidynes |
| R2C…− | carbene radical anions |
| R2CH–O. | ketyls |
| R2C(OH)–(OH)R2 | pinacols |
| R2C(OH)NR2 | hemiaminals |
| R2C(OH)OR | hemiketals |
| R2C(OH)OR' | hemiacetals |
| R2C(OR')NR2 | hemiaminals |
| R2C(OR')SH | thiohemiacetals |
| R2C(OR')(SR') | thioacetals |
| R2C(SR')2 | thioacetals |
| R2C(SR')OH | thiohemiacetals |
| R2C(SR')SH | thiohemiacetals |
| R2C+–CR=C−R | vinyl carbenes |
| R2Ge: | carbene analogues |
| R2Ge: | germylidenes |
| R2Mg | Grignard reagents |
| R2N. | aminyl radicals |
| R2N.+–O− | aminoxyl radicals |
| R2N+=CH[CH=CH]nNR2 | cyanine dyes |
| R2N–O− | aminoxides |
| R2N–O. | aminoxyl radicals |
| R2N–OH | aminoxides |
| (R2N)4C | ortho amides |
| R2NC(=O)OH | urethanes (urethans) |
| R2NC(=O)OR' | urethanes (urethans) |
| R2NCR=CR2 | enamines |
| R2N[CH=CH]nCH=N+R2 | cyanine dyes |
| R2NNO | nitrosamines |
| (R2N:+) | nitrenium ions |
| R2O | moiety |
| R2O+–C−R2 | oxonium ylides |
| R2PH | phosphines |
| R2POH | amides |
| R2Pb: | carbene analogues |
| R2Pb: | plumbylidenes |
| R2S=O | sulfoxides |
| R2S(=O)=NR | sulfoximides |
| R2SbH | stibines |
| R2Se=O | selenoxides |
| R2Se(=O)2 | selenones |
| R2Si: | carbene analogues |
| R2Sn: | stannylidenes |
| R2Sn: | carbene analogues |
| R2Te(=O)2 | tellurones |
| R2X+ | halonium ions |
| R2Z+–N−R | imides |
| R3 | E, Z |
| R3 | E, Z |
| R3 | E, Z |
| R3As | arsines |
| R3As | arsines |
| R3Bi | bismuthines |
| R3C–C(Y)=X | bisecting conformation (eclipsing conformation) |
| R3N | amine imides |
| R3N+–C−R2 | ylides |
| R3P | phosphines |
| R3P | phosphines |
| R3P=CR2 | phosphonium ylides |
| R3P=O | phosphine oxides |
| R3P+–C−R2 | phosphonium ylides |
| R3P+–O− | phosphine oxides |
| R3S+ | sulfonium compounds |
| R3Sb | stibines |
| R3Sb | stibines |
| R3Si– | silyl groups |
| R3SiC(=O)R | ketones |
| R3SiOH | silanols |
| R3SiOR | ethers |
| R3Si. | silyl radicals |
| R3Y+–N−R | imides |
| R4 | E, Z |
| R4 | E, Z |
| R4 | E, Z |
| [R4As]+X− | arsonium compounds |
| [R4P+]X− | phosphonium compounds |
| R4P. | phosphoranyl radicals |
| [R4Sb]+X− | stibonium compounds |
| RH | diazoamino compounds |
| RkE(=O)l(OH)m | acyl species |
| RkE(=O)l(OH)m | cyclic acid anhydrides (cyclic anhydrides) |
| RkE(=O)l(OH)m | hydroxamic acids |
| RkE(=O)l(OH)m | acyl groups |
| RkE(=O)l(OH)m | hydroximic acids |
| RkE(=O)l(OH)m | anilides |
| RkE(=O)l(OH)m | hydrazonic acids |
| RkE(=O)l(OH)m | hydrazides |
| RkE(=O)l(OH)m | amides |
| RkE(=O)l(OH)m | esters |
| RkE(=O)l(OH)m | imidic acids |
| RmX | ylides |
| RmX | ylides |
| RmX=Y | ylides |
| RmX=YRn | ylides |
| RmX+–C−R2 | ylides |
| RmX+–Y− | ylides |
| RmX+–Y−Rn | ylides |
| RnE(=O)OH | amidines |
| RnE(NR2)m | amides |
| RnE(OH)m | amides |
| Ro | steric effect |
| RoY | steric effect |
| RSR | sulfides |
| SbnHn+2 | stibanes |
| (SiH)2n(NH)3n | silasesquiazanes |
| (SiH)2nO3n | silasesquioxanes |
| (SiH)2nS3n | silasesquithianes |
| SinH2n+1OH | silanols |
| SinH2n+2 | silanes |
| Sm | semiconductor-metal transition |
| Sm | semiconductor-metal transition |
| SmS | semiconductor-metal transition |
| SmS | semiconductor-metal transition |
| Sm+2S2− | valence transition |
| (Sm+3+e−)S2− | valence transition |
| Sn | hydropolysulfides |
| ThO2 | solute-volatilization interference
in flame spectroscopy |
| [TS]‡ | kinetic isotope effect |
| X | dipolar compounds |
| X | halonium ions |
| X | bisecting conformation (eclipsing conformation) |
| X | halonium ions |
| X | cross-conjugation |
| X | charge-transfer reaction in mass spectrometry |
| X | halonium ions |
| X | extended Hammett equation |
| X | cross-conjugation |
| X | dipolar compounds |
| X | extrusion transformation |
| X | protonated molecule in mass spectrometry |
| X | dual substituent-parameter equation |
| X | insertion |
| X | extrusion transformation |
| X | bisecting conformation (eclipsing conformation) |
| X | Hammett equation (Hammett relation) |
| X | umpolung |
| X | cross-conjugation |
| X | dipolar compounds |
| X | Hammett equation (Hammett relation) |
| X | Hammett equation (Hammett relation) |
| X | halonium ions |
| X | extended Hammett equation |
| X | phosphonitriles |
| X | halonium ions |
| X− | common-ion effect (on rates) |
| X+ | common-ion effect (on rates) |
| X+ | ion pair |
| X+ | ion pair |
| X–N=Z | dipolar compounds |
| X+Y− | ion pair |
| X2 | pseudohalogens |
| X=Y+–Z− | dipolar compounds |
| X≡N+–Z− | dipolar compounds |
| Xabc2 | pro-R, pro-S |
| XC6H4GY | cross-conjugation |
| XC6H4Y | Hammett equation (Hammett relation) |
| XC6H4Y | Hammett equation (Hammett relation) |
| XH+ | protonated molecule in mass spectrometry |
| XZ | insertion |
| X' | telomerization |
| X' | telomerization |
| X'' | telomerization |
| X'' | telomerization |
| X−–Y+=Z | dipolar compounds |
| X−=N–Z+ | dipolar compounds |
| X−=N+=Z | dipolar compounds |
| X−=Y–Z+ | dipolar compounds |
| X+ | ylides |
| X+–Y–Z− | dipolar compounds |
| X+=C–Z− | dipolar compounds |
| X:–C=Z | dipolar compounds |
| [X2PN]n | phosphonitriles |
| Y | imides |
| Y | ylides |
| Y | extrusion transformation |
| Y | insertion |
| Y | dipolar compounds |
| Y | ylides |
| Y | steric effect |
| Y− | ion pair |
| Y− | ion pair |
| YBa2Cu3O7-x | superconducting transition |
| Y− | ylides |
| Z | dipolar compounds |
| Z | extrusion transformation |
| Z | insertion |
| Z | dipolar compounds |
| Z | dipolar compounds |
| Z | imides |
| Z | extrusion transformation |
| Z− | ion pair return |
| Z=X+–Y−Rn | ylides |
| Z−–X+=YRn | ylides |
| α | syntectic reaction |
