| (dma)2CH+ |
| E Param.: -7.02 |      | J. Am. Chem. Soc. 2001, 123, 9500-9512 10.1021/ja010890y |
| 6-cyano-4-nitrobenzofuroxan |
| E Param.: -7.01 |    | J. Org. Chem. 2005, 70, 6242-6253 10.1021/jo0505526 |
| (S,E)-2,2,3-trimethyl-4-oxo-1-((E)-3-phenylallylidene)-5-(3,4,5-trimethoxybenzyl)imidazolidin-1-ium |
dichloromethane | E Param.: -7.00 |   | Angew. Chem. Int. Ed. 2013, 52, 7967-7971 10.1002/anie.201301864 |
| bis(5-methoxy-1-methylindol-3-yl)methylium ion |
| E Param.: -6.90 |    | J. Org. Chem. 2015, 80, 8643-8656 10.1021/acs.joc.5b01298 |
| 2,3,4,5,6,6-hexachlorocyclohexa-2,4-dien-1-one |
MeCN | E Param.: -6.75 |    | Org. Lett. 2010, 12, 2238-2241 10.1021/ol100592j |
| dimethylmethyleneammonium ion |
| E Param.: -6.69 |  | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
| N-(trifluoromethyl)thio)saccharin |
| E Param.: -6.48 |    | Angew. Chem. Int. Ed. 2018, 57, 12690-12695 10.1002/anie.201805859 |
| 2-phenyl-1,3-dithianylium ion |
| E Param.: -6.43 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
| 4-cyano-6-nitro-benzofuroxane |
| E Param.: -6.41 |    | J. Org. Chem. 2005, 70, 6242-6253 10.1021/jo0505526 |
| 3-(4-(dimethylamino)benzylidene)-1-methyl-3H-indol-1-ium ion |
| E Param.: -6.26 |    | J. Org. Chem. 2015, 80, 8643-8656 10.1021/acs.joc.5b01298 |
| 1-phenyl-propyn-1-ylium-Co2(CO)5(PPh3) |
| E Param.: -6.19 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
| 4-nitrobenzodifuroxan (NBDF) |
| E Param.: -6.15 |    | Chem. Eur. J. 2007, 13, 8317-8324 10.1002/chem.200700676 |
| (S,E)-5-benzyl-2,2,3-trimethyl-1-((E)-3-(3-nitrophenyl)allylidene)-4-oxoimidazolidin-1-ium |
dichloromethane | E Param.: -6.10 |   | Asian J. Org. Chem. 2014, 3, 550-555 10.1002/ajoc.201402009 |
| N-(phenylsulfonyl)-N-((trifluoromethyl)thio)benzenesulfonamide |
| E Param.: -6.06 |    | Angew. Chem. Int. Ed. 2018, 57, 12690-12695 10.1002/anie.201805859 |
| (S,E)-2,2,3-trimethyl-4-oxo-5-((perfluorophenyl)methyl)-1-((E)-3-phenylallylidene)imidazolidin-1-ium |
dichloromethane | E Param.: -6.00 |   | Angew. Chem. Int. Ed. 2013, 52, 7967-7971 10.1002/anie.201301864 |
| (S,E)-5-benzyl-1-((E)-3-(4-cyanophenyl)allylidene)-2,2,3-trimethyl-4-oxoimidazolidin-1-ium |
dichloromethane | E Param.: -6.00 |   | Asian J. Org. Chem. 2014, 3, 550-555 10.1002/ajoc.201402009 |
| bis(1-methylindol-3-yl)methylium ion |
| E Param.: -5.99 |    | J. Org. Chem. 2015, 80, 8643-8656 10.1021/acs.joc.5b01298 |
| 2-phenyl-1,3-dithiolan-2-ylium ion |
| E Param.: -5.91 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
| (S,E)-5-benzyl-2,2,3-trimethyl-1-((E)-3-(4-nitrophenyl)allylidene)-4-oxoimidazolidin-1-ium |
dichloromethane | E Param.: -5.90 |   | Asian J. Org. Chem. 2014, 3, 550-555 10.1002/ajoc.201402009 |
| (2S,5S)-5-benzyl-3-methyl-4-oxo-1-(3-phenylallylidene)-2-((E)-styryl)imidazolidin-1-ium |
dichloromethane | E Param.: -5.90 |   | Asian J. Org. Chem. 2014, 3, 550-555 10.1002/ajoc.201402009 |
| (mpa)2CH+ |
| E Param.: -5.89 |      | J. Am. Chem. Soc. 2001, 123, 9500-9512 10.1021/ja010890y |
| 4-aza-6-nitrobenzofuroxan |
| E Param.: -5.86 |    | J. Org. Chem. 2005, 70, 6242-6253 10.1021/jo0505526 |
| Vilsmeier ion |
| E Param.: -5.77 |  | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
| (mor)2CH+ |
| E Param.: -5.53 |      | J. Am. Chem. Soc. 2001, 123, 9500-9512 10.1021/ja010890y |
| MacMillan-iminium ion (2nd generation) |
MeCN | E Param.: -5.52 |    | Angew. Chem. Int. Ed. 2011, 50, 9953-9956 10.1002/anie.201103683 |
| 4,6-dinitrobenzofurazan |
| E Param.: -5.46 |    | J. Org. Chem. 2005, 70, 6242-6253 10.1021/jo0505526 |
| N-fluoro-2,6-dichloropyridinium tetrafluoroborate |
| E Param.: -5.29 |    | J. Am. Chem. Soc. 2018, 140, 11474-11486 10.1021/jacs.8b07147 |
| Selectfluor |
| E Param.: -5.20 |    | J. Am. Chem. Soc. 2018, 140, 11474-11486 10.1021/jacs.8b07147 |
| methyl(phenyl)methyleneammonium ion |
| E Param.: -5.17 |  | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
| (E)-2-methyl-3-(4-methylbenzylidene)-3H-indol-1-ium ion |
| E Param.: -5.15 |    | J. Org. Chem. 2015, 80, 8643-8656 10.1021/acs.joc.5b01298 |
| 4,6-dinitrobenzofuroxan |
| E Param.: -5.06 |    | J. Org. Chem. 2006, 71, 9088-9095 10.1021/jo0614339 |
| (E)-2-(tert-butyl)-3-(4-methylbenzylidene)-3H-indol-1-ium |
dichloromethane | E Param.: -5.06 |  | Eur. J. Org. Chem. 2016, , 4050-4058 10.1002/ejoc.201600572 |
| (E)-1,2-dimethyl-3-(4-methylbenzylidene)-3H-indol-1-ium ion |
| E Param.: -5.05 |    | J. Org. Chem. 2015, 80, 8643-8656 10.1021/acs.joc.5b01298 |
| (E)-3-benzylidene-1,2-dimethyl-3H-indol-1-ium ion |
| E Param.: -4.96 |   | J. Org. Chem. 2015, 80, 8643-8656 10.1021/acs.joc.5b01298 |
| 2-(4-methoxyphenyl)chromenylium ion |
| E Param.: -4.95 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
| 4-nitro-6-(trifluoromethylsulfonyl)benzofuroxan |
| E Param.: -4.91 |    | J. Org. Chem. 2005, 70, 6242-6253 10.1021/jo0505526 |
| (dpa)2CH+ |
| E Param.: -4.72 |      | J. Am. Chem. Soc. 2001, 123, 9500-9512 10.1021/ja010890y |
| 4,6-dinitrotetrazolopyridine |
| E Param.: -4.67 |    | J. Org. Chem. 2005, 70, 6242-6253 10.1021/jo0505526 |
| 9-(4-(dimethylamino)phenyl)-9H-fluoren-9-ylium |
dichloromethane | E Param.: -4.51 |    | Chem. Eur. J. 2017, 23, 623-630 10.1002/chem.201603963 |
| (4-MeO)3-tritylium ion |
| E Param.: -4.35 |  | J. Am. Chem. Soc. 2003, 125, 286-295 10.1021/ja021010y |
| (mfa)2CH+ |
| E Param.: -3.85 |      | J. Am. Chem. Soc. 2001, 123, 9500-9512 10.1021/ja010890y |
| tropylium ion |
| E Param.: -3.72 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
| 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) |
MeCN | E Param.: -3.66 |    | J. Am. Chem. Soc. 2013, 135, 12377-12387 10.1021/ja405890d |
| C7H7+-Fe(CO)3 |
| E Param.: -3.49 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
| flavylium ion |
| E Param.: -3.45 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
| (pfa)2CH+ |
| E Param.: -3.14 |      | J. Am. Chem. Soc. 2001, 123, 9500-9512 10.1021/ja010890y |
| (4-MeO)2-tritylium ion |
| E Param.: -3.04 |  | J. Am. Chem. Soc. 2003, 125, 286-295 10.1021/ja021010y |
| 3-(4-methoxybenzylidene)-1-methyl-3H-indol-1-ium iom |
| E Param.: -3.02 |    | J. Org. Chem. 2015, 80, 8643-8656 10.1021/acs.joc.5b01298 |
| fc(ani)CH+ |
| E Param.: -2.90 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
| Me2C=C=N(+)Me2 |
| E Param.: -2.80 |  | Synthesis 2025, 57, 3251-3262 10.1055/a-2649-1999 |