| N-fluoro-2,6-dichloropyridinium tetrafluoroborate |
| E Param.: -5.29 |    | J. Am. Chem. Soc. 2018, 140, 11474-11486 10.1021/jacs.8b07147 |
| 4,6-dinitrobenzofurazan |
| E Param.: -5.46 |    | J. Org. Chem. 2005, 70, 6242-6253 10.1021/jo0505526 |
| 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 |