|  
 (2S,5S)-5-benzyl-3-methyl-4-oxo-1-(3-phenylallylidene)-2-((E)-styryl)imidazolidin-1-ium
 | dichloromethane | E Parameter: -5.90 
 |   | Asian J. Org. Chem. 2014, 3, 550-555 DOI: 10.1002/ajoc.201402009
 | 
|  
 (PhCH2)2N+=CH-CH-Ph
 | 0 | E Parameter: -8.50 
 |    | Angew. Chem. Int. Ed. 2008, 47, 8723-8726 DOI: 10.1002/anie.200802889
 | 
|  
 (S,E)-2,2,3-trimethyl-4-oxo-1-((E)-3-phenylallylidene)-5-(3,4,5-trimethoxybenzyl)imidazolidin-1-ium
 | dichloromethane | E Parameter: -7.00 
 |   | Angew. Chem. Int. Ed. 2013, 52, 7967-7971 DOI: 10.1002/anie.201301864
 | 
|  
 (S,E)-2,2,3-trimethyl-4-oxo-5-((perfluorophenyl)methyl)-1-((E)-3-phenylallylidene)imidazolidin-1-ium
 | dichloromethane | E Parameter: -6.00 
 |   | Angew. Chem. Int. Ed. 2013, 52, 7967-7971 DOI: 10.1002/anie.201301864
 | 
|  
 (S,E)-5-((1H-indol-3-yl)methyl)-2,2,3-trimethyl-4-oxo-1-((E)-3-phenylallylidene)imidazolidin-1-ium
 | dichloromethane | E Parameter: -7.30 
 |   | Asian J. Org. Chem. 2014, 3, 550-555 DOI: 10.1002/ajoc.201402009
 | 
|  
 (S,E)-5-benzyl-1-((E)-3-(4-(dimethylamino)phenyl)allylidene)-2,2,3-trimethyl-4-oxoimidazolidin-1-ium
 | dichloromethane | E Parameter: -10.60 
 |   | Asian J. Org. Chem. 2014, 3, 550-555 DOI: 10.1002/ajoc.201402009
 | 
|  
 (S,E)-5-benzyl-1-((E)-3-(4-cyanophenyl)allylidene)-2,2,3-trimethyl-4-oxoimidazolidin-1-ium
 | dichloromethane | E Parameter: -6.00 
 |   | Asian J. Org. Chem. 2014, 3, 550-555 DOI: 10.1002/ajoc.201402009
 | 
|  
 (S,E)-5-benzyl-1-((E)-3-(4-methoxyphenyl)allylidene)-2,2,3-trimethyl-4-oxoimidazolidin-1-ium
 | dichloromethane | E Parameter: -8.00 
 |   | Asian J. Org. Chem. 2014, 3, 550-555 DOI: 10.1002/ajoc.201402009
 | 
|  
 (S,E)-5-benzyl-2,2,3-trimethyl-1-((E)-3-(3-nitrophenyl)allylidene)-4-oxoimidazolidin-1-ium
 | dichloromethane | E Parameter: -6.10 
 |   | Asian J. Org. Chem. 2014, 3, 550-555 DOI: 10.1002/ajoc.201402009
 | 
|  
 (S,E)-5-benzyl-2,2,3-trimethyl-1-((E)-3-(4-nitrophenyl)allylidene)-4-oxoimidazolidin-1-ium
 | dichloromethane | E Parameter: -5.90 
 |   | Asian J. Org. Chem. 2014, 3, 550-555 DOI: 10.1002/ajoc.201402009
 | 
|  
 (S,E)-5-benzyl-2,2,3-trimethyl-4-oxo-1-((E)-3-(p-tolyl)allylidene)imidazolidin-1-ium
 | dichloromethane | E Parameter: -7.20 
 |   | Asian J. Org. Chem. 2014, 3, 550-555 DOI: 10.1002/ajoc.201402009
 | 
|  
 dimethylmethyleneammonium ion
 | 0 | E Parameter: -6.69 
 |  | Acc. Chem. Res. 2003, 36, 66-77 DOI: 10.1021/ar020094c
 | 
|  
 indolecarboxylate derived iminium ion
 | dichloromethane | E Parameter: -9.50 
 |   | Angew. Chem. Int. Ed. 2009, 48, 5034-5037 DOI: 10.1002/anie.200900933
 | 
|  
 Jorgensen/Hayashi-iminium ion
 | 0 | E Parameter: -8.20 
 |    | Angew. Chem. Int. Ed. 2008, 47, 8723-8726 DOI: 10.1002/anie.200802889
 | 
|  
 MacMillan-iminium ion (1st generation)
 | MeCN | E Parameter: -7.37 
 |    | Angew. Chem. Int. Ed. 2011, 50, 9953-9956 DOI: 10.1002/anie.201103683
 | 
|  
 MacMillan-iminium ion (2nd generation)
 | MeCN | E Parameter: -5.52 
 |    | Angew. Chem. Int. Ed. 2011, 50, 9953-9956 DOI: 10.1002/anie.201103683
 | 
|  
 MacMillan-iminium ion (spiro)
 | MeCN | E Parameter: -7.67 
 |    | Angew. Chem. Int. Ed. 2011, 50, 9953-9956 DOI: 10.1002/anie.201103683
 | 
|  
 Me2N+=CH-CH-Ph
 | 0 | E Parameter: -9.20 
 |    | Angew. Chem. Int. Ed. 2008, 47, 8723-8726 DOI: 10.1002/anie.200802889
 | 
|  
 methyl(phenyl)methyleneammonium ion
 | 0 | E Parameter: -5.17 
 |  | Acc. Chem. Res. 2003, 36, 66-77 DOI: 10.1021/ar020094c
 | 
|  
 mor iminium
 | 0 | E Parameter: -8.60 
 |    | Angew. Chem. Int. Ed. 2008, 47, 8723-8726 DOI: 10.1002/anie.200802889
 | 
|  
 N-ethylidenecarbazolium ion
 | 0 | E Parameter: 2.41 
 |    | Acc. Chem. Res. 2003, 36, 66-77 DOI: 10.1021/ar020094c
 | 
|  
 N-methylacridinium ion
 | 0 | E Parameter: -7.15 
 |    | Acc. Chem. Res. 2003, 36, 66-77 DOI: 10.1021/ar020094c
 | 
|  
 p-AniCH=N+Me2 (in MeCN)
 | MeCN | E Parameter: -10.69 
 |    | J. Am. Chem. Soc. 2013, 135, 6579-6587 DOI: 10.1021/ja401106x
 | 
|  
 p-CF3-C6H4-CH=N+Me2 (in MeCN)
 | MeCN | E Parameter: -8.34 
 |    | J. Am. Chem. Soc. 2013, 135, 6579-6587 DOI: 10.1021/ja401106x
 | 
|  
 PhCH=N+(CH2)4 (in MeCN)
 | MeCN | E Parameter: -9.35 
 |    | J. Am. Chem. Soc. 2013, 135, 6579-6587 DOI: 10.1021/ja401106x
 | 
|  
 PhCH=N+(CH2)5 (in MeCN)
 | MeCN | E Parameter: -9.60 
 |    | J. Am. Chem. Soc. 2013, 135, 6579-6587 DOI: 10.1021/ja401106x
 | 
|  
 PhCH=N+Me2 (in MeCN)
 | MeCN | E Parameter: -9.27 
 |    | J. Am. Chem. Soc. 2013, 135, 6579-6587 DOI: 10.1021/ja401106x
 | 
|  
 pipN+=CH-CH-Ph
 | 0 | E Parameter: -10.30 
 |  | Angew. Chem. Int. Ed. 2008, 47, 8723-8726 DOI: 10.1002/anie.200802889
 | 
|  
 pTolCH=N+CH2 (in MeCN)
 | MeCN | E Parameter: -9.64 
 |    | J. Am. Chem. Soc. 2013, 135, 6579-6587 DOI: 10.1021/ja401106x
 | 
|  
 pyrN+=CH-CH-Ph
 | 0 | E Parameter: -9.80 
 |    | Angew. Chem. Int. Ed. 2008, 47, 8723-8726 DOI: 10.1002/anie.200802889
 | 
|  
 Vilsmeier ion
 | 0 | E Parameter: -5.77 
 |  | Acc. Chem. Res. 2003, 36, 66-77 DOI: 10.1021/ar020094c
 |