| p-tosyl isocyanate | MeCN | E Param.: -7.69 |    | J. Am. Chem. Soc. 2020, 142, 8383-8402 10.1021/jacs.0c01960
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| MacMillan-iminium ion (spiro) | MeCN | E Param.: -7.67 |    | Angew. Chem. Int. Ed. 2011, 50, 9953-9956 10.1002/anie.201103683
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| diarylallylium ion (4-NMe2)2 |  | E Param.: -7.50 |    | J. Org. Chem. 2011, 76, 9391-9408 10.1021/jo201668w
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| (ethene-1,1-diyldisulfonyl)dibenzene | DMSO | E Param.: -7.50 |    | Chem. Asian J. 2012, 7, 1401-1407 10.1002/asia.201101046
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| MacMillan-iminium ion (1st generation) | MeCN | E Param.: -7.37 |    | Angew. Chem. Int. Ed. 2011, 50, 9953-9956 10.1002/anie.201103683
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| (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
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| (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
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| N-methylacridinium ion |  | E Param.: -7.15 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c
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| (dma)2CH+ |  | E Param.: -7.02 |      | J. Am. Chem. Soc. 2001, 123, 9500-9512 10.1021/ja010890y
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| 6-cyano-4-nitrobenzofuroxan |  | E Param.: -7.01 |    | J. Org. Chem. 2005, 70, 6242-6253 10.1021/jo0505526
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| (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
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| 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
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| dimethylmethyleneammonium ion |  | E Param.: -6.69 |  | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c
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| 2-phenyl-1,3-dithianylium ion |  | E Param.: -6.43 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c
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| 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
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| 1-phenyl-propyn-1-ylium-Co2(CO)5(PPh3) |  | E Param.: -6.19 |    | Acc. Chem. Res. 2003, 36, 66-77 10.1021/ar020094c
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| 4-nitrobenzodifuroxan (NBDF) |  | E Param.: -6.15 |    | Chem. Eur. J. 2007, 13, 8317-8324 10.1002/chem.200700676
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| (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
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| (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
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