Mayr's Database of Reactivity Parameters

Electrophiles

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Name Solvent Reactivity
Parameters
Classification Reference
(title or year)
1-methylsulfanylpropan-2-one (in DMSO)
C4H8OS *
DMSO

E Param.: -15.60

* J. Am. Chem. Soc. 2018, 140, 5500-5515
10.1021/jacs.8b01657
4-benzylidene-2,6-di-tert-butylcyclohexa-2,5-dien-1-one
C21H26O *

E Param.: -15.58

*** Chem. Eur. J. 2025, 31, e202501224
10.1002/chem.202501224
(E)-6-((1-methyl-1H-indol-2-yl)methylene)benzo[d][1,3]dioxol-5(6H)-one
C17H13NO3 *

E Param.: -15.55

*** Org. Biomol. Chem. 2025, 23, 827-834
10.1039/D4OB01855A
1,2-diaza-1,3-diene 1d
*
DMSO

E Param.: -15.38

*** Chem. Eur. J. 2010, 16, 12008-12016
10.1002/chem.201000828
phenyl isocyanate
C7H5NO *
MeCN

E Param.: -15.38

*** J. Am. Chem. Soc. 2020, 142, 8383-8402
10.1021/jacs.0c01960
1,2-diaza-1,3-diene 1f
*
MeOH

E Param.: -15.30

* Chem. Eur. J. 2010, 16, 12008-12016
10.1002/chem.201000828
1-phenylprop-2-en-1-one (in DMSO)
C9H8O *
DMSO

E Param.: -15.25

*** J. Am. Chem. Soc. 2017, 139, 13318-13329
10.1021/jacs.7b05106
(E)-6-(4-methoxybenzylidene)benzo[d][1,3]dioxol-5(6H)-one
C15H12O4 *

E Param.: -15.20

*** Chem. Eur. J. 2025, 31, e202403785
10.1002/chem.202403785
2,6-di-tert-butyl-4-(methoxymethylene)cyclohexa-2,5-dien-1-one
C16H24O2 *

E Param.: -15.10

*** Chem. Eur. J. 2025, 31, e202501224
10.1002/chem.202501224
(E)-N-(4-(dimethylamino)benzylidene)-4-methylbenzenesulfonamide (in DMSO)
C16H18N2O2S *
DMSO

E Param.: -15.09

*** J. Am. Chem. Soc. 2011, 133, 8240-8251
10.1021/ja200820m
2,6-di-tert.butyl-4-(3-fluorobenzylidene)cyclohexa-2,5-dienone
C21H25FO *

E Param.: -15.03

*** Eur. J. Org. Chem. 2009, , 3203-3211
10.1002/ejoc.200900299
1,2-diaza-1,3-diene 1c
*
DMSO

E Param.: -14.91

*** Chem. Eur. J. 2010, 16, 12008-12016
10.1002/chem.201000828
1,2-diaza-1,3-diene 1e
*
MeOH

E Param.: -14.90

* Chem. Eur. J. 2010, 16, 12008-12016
10.1002/chem.201000828
3-nitro-1-tosyl-1H-indole
C15H12N2O4S *

E Param.: -14.87

*** Chem. Commun. 2021, 57, 10071-10074
10.1039/d1cc04074j
(E)-6-(4-methylbenzylidene)benzo[d][1,3]dioxol-5(6H)-one
C15H12O3 *

E Param.: -14.85

*** Chem. Eur. J. 2025, 31, e202403785
10.1002/chem.202403785
4-methoxy-<i>trans-beta</i>-nitrostyrene
*

E Param.: -14.70

*** J. Org. Chem. 2011, 76, 9370-9378
10.1021/jo201678u
jul-indan-1,3-dione
C22H19NO2 *

E Param.: -14.68

*** Org. Biomol. Chem. 2007, 5, 3020-3026
10.1039/b708025e
4-bromo-3-nitro-1-tosyl-1H-indole
C15H11BrN2O4S *

E Param.: -14.60

** Chem. Commun. 2021, 57, 10071-10074
10.1039/d1cc04074j
2-(4-methoxybenzylidene)-1,3-dithiane 1,1,3,3-tetraoxide
*
DMSO

E Param.: -14.55

*** Chem. Asian J. 2012, 7, 1401-1407
10.1002/asia.201101046
((2-(2-iodophenyl)propan-2-yl)oxy)(trifluoromethyl)sulfane
*

E Param.: -14.52

*** Angew. Chem. Int. Ed. 2018, 57, 12690-12695
10.1002/anie.201805859
2,6-di-tert.butyl-4-(3,5-difluorobenzylidene)cyclohexa-2,5-dienone
C21H24F2O *

E Param.: -14.50

*** Eur. J. Org. Chem. 2009, , 3203-3211
10.1002/ejoc.200900299
(E)-6-benzylidenebenzo[d][1,3]dioxol-5(6H)-one
C14H10O3 *

E Param.: -14.47

*** Chem. Eur. J. 2025, 31, e202403785
10.1002/chem.202403785
[(1,3-Diarylallyl)Pd(PPh3)2]+ (Aryl = 4-(dimethylamino)phenyl)
*

E Param.: -14.46

*** Organometallics 2012, 31, 2416-2424
10.1021/om3000357
2,6-di-tert.butyl-4-(4-nitrobenzylidene)cyclohexa-2,5-dienone
C21H25NO3 *

E Param.: -14.36

*** Eur. J. Org. Chem. 2009, , 3203-3211
10.1002/ejoc.200900299
4-methyl-<i>trans-beta</i>-nitrostyrene
*

E Param.: -14.23

*** J. Org. Chem. 2011, 76, 9370-9378
10.1021/jo201678u
(E)-tert-butyl benzylidenecarbamate (in DMSO)
C12H15NO2 *
DMSO

E Param.: -14.22

*** J. Am. Chem. Soc. 2011, 133, 8240-8251
10.1021/ja200820m
[(1,3-Diarylallyl)Pd(PPh3)2]+ (Aryl = 3,5-difluorophenyl)
*

E Param.: -14.21

*** Organometallics 2012, 31, 2416-2424
10.1021/om3000357
[(1,3-Diarylallyl)Pd(PPh3)2]+ (Aryl = Ph)
*

E Param.: -14.14

*** Organometallics 2012, 31, 2416-2424
10.1021/om3000357
ethyl 3-nitro-1H-indole-1-carboxylate
C11H10N2O4 *

E Param.: -14.10

** Chem. Commun. 2021, 57, 10071-10074
10.1039/d1cc04074j
N-methyl maleimide
C5H7NO2 *
DMSO

E Param.: -14.07

*** Eur. J. Org. Chem. 2014, , 2956-2963
10.1002/ejoc.201301779
(E)-6-(3-fluorobenzylidene)benzo[d][1,3]dioxol-5(6H)-one
C14H9FO3 *

E Param.: -14.00

*** Chem. Eur. J. 2025, 31, e202403785
10.1002/chem.202403785
(E)-6-(4-chlorobenzylidene)benzo[d][1,3]dioxol-5(6H)-one
C14H9ClO3 *

E Param.: -13.99

*** Chem. Eur. J. 2025, 31, e202403785
10.1002/chem.202403785
jul Meldrum's acid
C19H21NO4 *

E Param.: -13.97

*** J. Org. Chem. 2008, 73, 2738-2745
10.1021/jo702590s
1,2-diaza-1,3-diene 1b
*
DMSO

E Param.: -13.90

*** Chem. Eur. J. 2010, 16, 12008-12016
10.1002/chem.201000828
(2-(4-methoxyphenyl)ethene-1,1-diyldisulfonyl)dibenzene
*
DMSO

E Param.: -13.88

*** Chem. Asian J. 2012, 7, 1401-1407
10.1002/asia.201101046
<i>trans-beta</i>-nitrostyrene
*

E Param.: -13.85

*** J. Org. Chem. 2011, 76, 9370-9378
10.1021/jo201678u
julBBS
C19H21N3O3 *

E Param.: -13.84

*** J. Org. Chem. 2007, 72, 9170-9180
10.1021/jo071273g
p-chloranil (C-Cl)
C6Cl4O2 *

E Param.: -13.84

*** J. Am. Chem. Soc. 2014, 136, 11499-11512
10.1021/ja505613b
((2-phenylpropan-2-yl)oxy)(trifluoromethyl)sulfane
*

E Param.: -13.77

*** Angew. Chem. Int. Ed. 2018, 57, 12690-12695
10.1002/anie.201805859
2,6-di-tert-butyl-4-ethylidenecyclohexa-2,5-dien-1-one
C16H24O *

E Param.: -13.68

*** Chem. Eur. J. 2025, 31, e202501224
10.1002/chem.202501224
2-(p-(dimethylamino)benzylidene)-indan-1,3-dione
C18H15NO2 *

E Param.: -13.56

*** Org. Biomol. Chem. 2007, 5, 3020-3026
10.1039/b708025e
(E)-6-(4-(trifluoromethyl)benzylidene)benzo[d][1,3]dioxol-5(6H)-one
C15H9F3O3 *

E Param.: -13.54

*** Chem. Eur. J. 2025, 31, e202403785
10.1002/chem.202403785
N-methyl-N-((trifluoromethyl)thio)-p-toluenesulfonamide
*

E Param.: -13.44

*** Angew. Chem. Int. Ed. 2018, 57, 12690-12695
10.1002/anie.201805859
dma(Ph)2QM
C27H23NO *

E Param.: -13.39

**** Angew. Chem. Int. Ed. 2002, 41, 91-95
10.1002/1521-3773(20[...]
Umemoto I (tetrafluoroborate)
*

E Param.: -13.39

*** Eur. J. Org. Chem. 2024, 27, e202400085
10.1002/ejoc.202400085
4-bromo-<i>trans-beta</i>-nitrostyrene
*

E Param.: -13.37

*** J. Org. Chem. 2011, 76, 9370-9378
10.1021/jo201678u
p-(dimethylamino)benzylidenemalononitrile
C12H11N3 *

E Param.: -13.30

*** J. Org. Chem. 2003, 68, 6880-6886
10.1021/jo0344182
1,2-diaza-1,3-diene 1a
*
DMSO

E Param.: -13.28

*** Chem. Eur. J. 2010, 16, 12008-12016
10.1002/chem.201000828
1,3,5-trinitrobenzene
C6H3N3O6 *

E Param.: -13.19, Deviation: ±0.45

*** J. Org. Chem. 2005, 70, 6242-6253
10.1021/jo0505526
(E)-6-(4-nitrobenzylidene)benzo[d][1,3]dioxol-5(6H)-one
C14H9NO5 *

E Param.: -13.15

*** Chem. Eur. J. 2025, 31, e202403785
10.1002/chem.202403785
Umemoto I (triflate)
*

E Param.: -13.08

*** Eur. J. Org. Chem. 2024, 27, e202400085
10.1002/ejoc.202400085
(E)-N-(4-methoxybenzylidene)-4-methylbenzenesulfonamide (in DMSO)
C15H15NO3S *
DMSO

E Param.: -13.05

*** J. Am. Chem. Soc. 2011, 133, 8240-8251
10.1021/ja200820m
2-(4-methoxybenzylidene)benzo[d][1,3]dithiole 1,1,3,3-tetraoxide
*
DMSO

E Param.: -13.02

*** Chem. Asian J. 2012, 7, 1401-1407
10.1002/asia.201101046
(2-phenylethene-1,1-diyldisulfonyl)dibenzene
*
DMSO

E Param.: -12.93

*** Chem. Asian J. 2012, 7, 1401-1407
10.1002/asia.201101046
benzaldehyde (in DMSO)
C7H6O *
DMSO

E Param.: -12.90

* J. Am. Chem. Soc. 2018, 140, 5500-5515
10.1021/jacs.8b01657
3,6-dinitro-1-tosyl-1H-indole
*

E Param.: -12.90

*** Chem. Commun. 2021, 57, 10071-10074
10.1039/d1cc04074j
Umemoto II (triflate)
*

E Param.: -12.80

*** Eur. J. Org. Chem. 2024, 27, e202400085
10.1002/ejoc.202400085
dmaBBS
C15H17N3O3 *

E Param.: -12.76

*** J. Org. Chem. 2007, 72, 9170-9180
10.1021/jo071273g
p-(dimethylamino)benzylidene Meldrum's acid
C15H17NO4 *

E Param.: -12.76

*** J. Org. Chem. 2008, 73, 2738-2745
10.1021/jo702590s
4-cyano-<i>trans-beta</i>-nitrostyrene
*

E Param.: -12.61

*** J. Org. Chem. 2011, 76, 9370-9378
10.1021/jo201678u
N-(trifluoromethyl)thio)succinimide
*

E Param.: -12.56

*** Angew. Chem. Int. Ed. 2018, 57, 12690-12695
10.1002/anie.201805859
4-nitro-<i>trans-beta</i>-nitrostyrene
*

E Param.: -12.37

*** J. Org. Chem. 2011, 76, 9370-9378
10.1021/jo201678u
2,4-dinitrothiophene
C4H2N2O4S *

E Param.: -12.33, Deviation: ±0.11

*** J. Org. Chem. 2005, 70, 6242-6253
10.1021/jo0505526
2,5-dichloroquinone (C-H)
C6H2Cl2O2 *

E Param.: -12.28

*** J. Am. Chem. Soc. 2014, 136, 11499-11512
10.1021/ja505613b
di-tert-butyl azodicarboxylate
*
MeCN

E Param.: -12.23

*** Chem. Eur. J. 2010, 16, 11670-11677
10.1002/chem.201001598
ani(Ph)2QM
C26H20O2 *

E Param.: -12.18

**** Angew. Chem. Int. Ed. 2002, 41, 91-95
10.1002/1521-3773(20[...]
p-chloranil (C=O)
C6Cl4O2 *

E Param.: -12.13

*** J. Am. Chem. Soc. 2014, 136, 11499-11512
10.1021/ja505613b
ethenesulfonyl fluoride (ESF)
*
DMSO

E Param.: -12.09

*** Angew. Chem. Int. Ed. 2016, 55, 12664-12667
10.1002/anie.201601875
o-chloranil (C-Cl)
C6Cl4O2 *

E Param.: -12.02

*** J. Am. Chem. Soc. 2014, 136, 11499-11512
10.1021/ja505613b
2-cinnamoyl-1-(2,6-dimethoxyphenyl)-3-methyl-1H-imidazol-3-ium
C21H21N2O3 *
DMSO

E Param.: -12.02

*** Top. Catal. 2018, 61, 585-590
10.1007/s11244-018-0[...]
ethyl 2-(3,5-di-tert-butyl-4-oxocyclohexa-2,5-dien-1-ylidene)acetate
C18H26O3 *

E Param.: -12.01

*** Chem. Eur. J. 2025, 31, e202501224
10.1002/chem.202501224
N-(trifluoromethyl)thio)phthalimide
*

E Param.: -11.92

*** Angew. Chem. Int. Ed. 2018, 57, 12690-12695
10.1002/anie.201805859
jul(S)BBS
C19H21N3O2S *

E Param.: -11.89

*** J. Org. Chem. 2007, 72, 9170-9180
10.1021/jo071273g
2-(3,5-di-tert-butyl-4-oxocyclohexa-2,5-dien-1-ylidene)acetonitrile
C16H21NO *

E Param.: -11.88

*** Chem. Eur. J. 2025, 31, e202501224
10.1002/chem.202501224
2,6-diphenyl-4-benzylidenecyclohexa-2,5-dienone
C25H18O *

E Param.: -11.87

*** Eur. J. Org. Chem. 2009, , 3203-3211
10.1002/ejoc.200900299
N-(difluoromethyl)thio)phthalimide
*

E Param.: -11.86

*** Angew. Chem. Int. Ed. 2018, 57, 12690-12695
10.1002/anie.201805859
1-(tert-butyl)-2-cinnamoyl-3-methyl-1H-imidazol-3-ium
C17H21N2O *
DMSO

E Param.: -11.80

*** Top. Catal. 2018, 61, 585-590
10.1007/s11244-018-0[...]
2-cinnamoyl-1-(4-methoxyphenyl)-3-methyl-1H-imidazol-3-ium
C20H19N2O2 *
DMSO

E Param.: -11.79

*** Top. Catal. 2018, 61, 585-590
10.1007/s11244-018-0[...]
2-benzylidenebenzo[d][1,3]dithiole 1,1,3,3-tetraoxide
*
DMSO

E Param.: -11.78

*** Chem. Asian J. 2012, 7, 1401-1407
10.1002/asia.201101046
2,6-di-tert-butyl-4-(2,2,2-trifluoroethylidene)cyclohexa-2,5-dien-1-one
C16H21F3O *
DMSO

E Param.: -11.68

*** Eur. J. Org. Chem. 2020, , 3812-3817
10.1002/ejoc.202000295
2-cinnamoyl-1,3-dimethyl-1H-imidazol-3-ium
C14H15N2O *
DMSO

E Param.: -11.52

*** Angew. Chem. Int. Ed. 2012, 51, 5234-5238
10.1002/anie.201109042
(E)-N-benzylidene-4-methylbenzenesulfonamide (in DMSO)
C14H13NO2S *
DMSO

E Param.: -11.50

*** J. Am. Chem. Soc. 2011, 133, 8240-8251
10.1021/ja200820m
2-cinnamoyl-1-mesityl-3-methyl-1H-imidazol-3-ium
C22H23N2O *
DMSO

E Param.: -11.48

*** Top. Catal. 2018, 61, 585-590
10.1007/s11244-018-0[...]
2-(p-methoxybenzylidene)-indan-1,3-dione
C17H12O3 *

E Param.: -11.32

*** Org. Biomol. Chem. 2007, 5, 3020-3026
10.1039/b708025e
maleic anhydride
C4H4O3 *
DMSO

E Param.: -11.31

*** Eur. J. Org. Chem. 2014, , 2956-2963
10.1002/ejoc.201301779
(4-NMe2)3-tritylium ion (= Crystal violet)
*

E Param.: -11.26

- J. Am. Chem. Soc. 2003, 125, 286-295
10.1021/ja021010y
2,2,4-trichloro-1(2H)-naphthalenone
*
MeCN

E Param.: -11.24

*** Org. Lett. 2010, 12, 2238-2241
10.1021/ol100592j
dicarbonyl(cyclopentadienyl)propene-iron(II)
*

E Param.: -11.20

*** Helv. Chim. Acta 2005, 88, 1754-1768
10.1002/hlca.200590137
2,6-di-tert-butyl-4-methylenecyclohexa-2,5-dien-1-one
C15H22O *

E Param.: -11.17

*** Chem. Eur. J. 2025, 31, e202501224
10.1002/chem.202501224
p-fluoranil (C-F)
C6F4O2 *

E Param.: -11.12

*** J. Am. Chem. Soc. 2014, 136, 11499-11512
10.1021/ja505613b
p-(methoxy)benzylidenemalononitrile
C11H8N2O *

E Param.: -10.80

*** J. Org. Chem. 2003, 68, 6880-6886
10.1021/jo0344182
dma(S)BBS
C15H17N3O2S *

E Param.: -10.73

*** J. Org. Chem. 2007, 72, 9170-9180
10.1021/jo071273g
diisopropyl azodicarboxylate
*
MeCN

E Param.: -10.71

*** Chem. Eur. J. 2010, 16, 11670-11677
10.1002/chem.201001598
p-AniCH=N+Me2 (in MeCN)
C10H14NO *
MeCN

E Param.: -10.69

*** J. Am. Chem. Soc. 2013, 135, 6579-6587
10.1021/ja401106x
(S,E)-5-benzyl-1-((E)-3-(4-(dimethylamino)phenyl)allylidene)-2,2,3-trimethyl-4-oxoimidazolidin-1-ium
C24H30N3O *
dichloromethane

E Param.: -10.60

** Asian J. Org. Chem. 2014, 3, 550-555
10.1002/ajoc.201402009
5,7,7-trichloro-8(7H)-quinolinone
*
MeCN

E Param.: -10.48

*** Org. Lett. 2010, 12, 2238-2241
10.1021/ol100592j
N-fluoro-2,4,6-trimethylpyridinium tetrafluoroborate
*

E Param.: -10.46

*** J. Am. Chem. Soc. 2018, 140, 11474-11486
10.1021/jacs.8b07147
aniBBS
C14H14N2O4 *

E Param.: -10.37

*** J. Org. Chem. 2007, 72, 9170-9180
10.1021/jo071273g
pipN+=CH-CH-Ph
C14H18N+ *

E Param.: -10.30

* Angew. Chem. Int. Ed. 2008, 47, 8723-8726
10.1002/anie.200802889
(4-NMe2)2-tritylium ion (= Malachite green)
*

E Param.: -10.29

- J. Am. Chem. Soc. 2003, 125, 286-295
10.1021/ja021010y