MacMillan-iminium ion (2nd generation) |
MeCN | E Param.: -5.52 |    | Angew. Chem. Int. Ed. 2011, 50, 9953-9956 10.1002/anie.201103683 |
(mor)2CH+ |
| E Param.: -5.53 |      | J. Am. Chem. Soc. 2001, 123, 9500-9512 10.1021/ja010890y |
Vilsmeier ion |
| E Param.: -5.77 |  | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
4-aza-6-nitrobenzofuroxan |
| E Param.: -5.86 |    | J. Org. Chem. 2005, 70, 6242-6253 10.1021/jo0505526 |
(mpa)2CH+ |
| E Param.: -5.89 |      | J. Am. Chem. Soc. 2001, 123, 9500-9512 10.1021/ja010890y |
(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 |
2-phenyl-1,3-dithiolan-2-ylium ion |
| E Param.: -5.91 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
bis(1-methylindol-3-yl)methylium ion |
| E Param.: -5.99 |    | J. Org. Chem. 2015, 80, 8643-8656 10.1021/acs.joc.5b01298 |
(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 |
N-(phenylsulfonyl)-N-((trifluoromethyl)thio)benzenesulfonamide |
| E Param.: -6.06 |    | Angew. Chem. Int. Ed. 2018, 57, 12690-12695 10.1002/anie.201805859 |
(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 |
4-nitrobenzodifuroxan (NBDF) |
| E Param.: -6.15 |    | Chem. Eur. J. 2007, 13, 8317-8324 10.1002/chem.200700676 |
1-phenyl-propyn-1-ylium-Co2(CO)5(PPh3) |
| E Param.: -6.19 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
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 |
4-cyano-6-nitro-benzofuroxane |
| E Param.: -6.41 |    | J. Org. Chem. 2005, 70, 6242-6253 10.1021/jo0505526 |
2-phenyl-1,3-dithianylium ion |
| E Param.: -6.43 |    | 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 |
dimethylmethyleneammonium ion |
| E Param.: -6.69 |  | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
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 |
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 |
(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 |
6-cyano-4-nitrobenzofuroxan |
| E Param.: -7.01 |    | J. Org. Chem. 2005, 70, 6242-6253 10.1021/jo0505526 |
(dma)2CH+ |
| E Param.: -7.02 |      | J. Am. Chem. Soc. 2001, 123, 9500-9512 10.1021/ja010890y |
N-methylacridinium ion |
| E Param.: -7.15 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
(S,E)-5-benzyl-2,2,3-trimethyl-4-oxo-1-((E)-3-(p-tolyl)allylidene)imidazolidin-1-ium |
dichloromethane | E Param.: -7.20 |   | Asian J. Org. Chem. 2014, 3, 550-555 10.1002/ajoc.201402009 |
(S,E)-5-((1H-indol-3-yl)methyl)-2,2,3-trimethyl-4-oxo-1-((E)-3-phenylallylidene)imidazolidin-1-ium |
dichloromethane | E Param.: -7.30 |   | Asian J. Org. Chem. 2014, 3, 550-555 10.1002/ajoc.201402009 |
MacMillan-iminium ion (1st generation) |
MeCN | E Param.: -7.37 |    | Angew. Chem. Int. Ed. 2011, 50, 9953-9956 10.1002/anie.201103683 |
diarylallylium ion (4-NMe2)2 |
| E Param.: -7.50 |    | J. Org. Chem. 2011, 76, 9391-9408 10.1021/jo201668w |
(ethene-1,1-diyldisulfonyl)dibenzene |
DMSO | E Param.: -7.50 |    | Chem. Asian J. 2012, 7, 1401-1407 10.1002/asia.201101046 |
MacMillan-iminium ion (spiro) |
MeCN | E Param.: -7.67 |    | Angew. Chem. Int. Ed. 2011, 50, 9953-9956 10.1002/anie.201103683 |
(pyr)2CH+ |
| E Param.: -7.69 |      | J. Am. Chem. Soc. 2001, 123, 9500-9512 10.1021/ja010890y |
p-tosyl isocyanate |
MeCN | E Param.: -7.69 |    | J. Am. Chem. Soc. 2020, 142, 8383-8402 10.1021/jacs.0c01960 |
C6H7+-Fe(CO)3 |
| E Param.: -7.76 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
1-methyl-3-((julolidin-9-yl)methylene)-3H-indol-1-ium ion |
| E Param.: -7.79 |    | J. Org. Chem. 2015, 80, 8643-8656 10.1021/acs.joc.5b01298 |
(4-NMe2)-tritylium ion |
| E Param.: -7.93 |  | J. Am. Chem. Soc. 2003, 125, 286-295 10.1021/ja021010y |
(S,E)-5-benzyl-1-((E)-3-(4-methoxyphenyl)allylidene)-2,2,3-trimethyl-4-oxoimidazolidin-1-ium |
dichloromethane | E Param.: -8.00 |   | Asian J. Org. Chem. 2014, 3, 550-555 10.1002/ajoc.201402009 |
Jorgensen/Hayashi-iminium ion |
| E Param.: -8.20 |    | Angew. Chem. Int. Ed. 2008, 47, 8723-8726 10.1002/anie.200802889 |
(thq)2CH+ |
| E Param.: -8.22 |      | J. Am. Chem. Soc. 2001, 123, 9500-9512 10.1021/ja010890y |
p-CF3-C6H4-CH=N+Me2 (in MeCN) |
MeCN | E Param.: -8.34 |    | J. Am. Chem. Soc. 2013, 135, 6579-6587 10.1021/ja401106x |
5-methoxyfuroxano[3,4-d]pyrimidine |
| E Param.: -8.37 |    | J. Phys. Org. Chem. 2003, 16, 431-437 10.1002/poc.606 |
NFSI |
MeCN | E Param.: -8.44 |    | J. Am. Chem. Soc. 2018, 140, 11474-11486 10.1021/jacs.8b07147 |
(PhCH2)2N+=CH-CH-Ph |
| E Param.: -8.50 |    | Angew. Chem. Int. Ed. 2008, 47, 8723-8726 10.1002/anie.200802889 |
fc2CH+ |
| E Param.: -8.54 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c |
mor iminium |
| E Param.: -8.60 |    | Angew. Chem. Int. Ed. 2008, 47, 8723-8726 10.1002/anie.200802889 |
ani(Br)2QM |
| E Param.: -8.63 |     | Angew. Chem. Int. Ed. 2002, 41, 91-95 10.1002/1521-3773(20[...] |
(ind)2CH+ |
| E Param.: -8.76 |      | J. Am. Chem. Soc. 2001, 123, 9500-9512 10.1021/ja010890y |
o-chloranil (C=O) |
| E Param.: -8.77 |    | J. Am. Chem. Soc. 2014, 136, 11499-11512 10.1021/ja505613b |
dibenzyl azodicarboxylate |
MeCN | E Param.: -8.89 |    | Chem. Eur. J. 2010, 16, 11670-11677 10.1002/chem.201001598 |