A Value - Table of A-Values

Table of A-Values

The following table lists some common A-values in kcal/mol:

Substituent A-Value Substituent A-Value Substituent A-Value
D 0.006 CH2Br 1.79 OSi(CH3)3 0.74
F 0.15 CH(CH3)2 2.15 OH 0.87
Cl 0.43 c-C6H11 2.15 OCH3 0.6
Br 0.38 C(CH3)3 >4 OCD3 0.56
I 0.43 Ph 3 OCH2CH3 0.9
CN 0.17 C2H 1.35 O-Ac 0.6
NC 0.21 CO2- 1.92 O-TFA 0.68
NCO 0.51 CO2CH3 1.27 OCHO 0.27
NCS 0.28 CO2Et 1.2 O-Ts 0.5
N=C=NR 1 CO2iPr 0.96 ONO2 0.59
CH3 1.7 COCl 1.25 NH2 1.6
CF3 2.1 COCH3 1.17 NHCH3 1
CH2CH3 1.75 SH 0.9 N(CH3)3 2.1
CH=CH2 1.35 SMe 0.7 NH3+ 1.9
CCH 0.41 SPh 0.8 NO2 1.1
CH2tBu 2 S- 1.3 HgBr ~0
CH2OTs 1.75 SOPh 1.9 HgCl 0.3
SO2Ph 2.5 Si(CH3)3 2.5

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