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. 2020 Dec 3;60(25):13738–13756. doi: 10.1002/anie.202008150

Table 1.

Comparison of Hammett constants (σpara) of various functional groups. [35]

Group

σpara

Group

σpara

F

0.06

C(O)C6H5

0.43

CF3

0.54

SO2N(CH3)2

0.65

NO2

0.78

NHSO2CF3

0.39

SO2C6H5

0.68

NHC(O)CF3

0.12