The effect of acyl substituents on the α-effect: contrasting α-effect profiles for reactions of 4-nitrophenyl substituted benzoates with neutral and anionic nucleophiles
作者:Ik-Hwan Um、Hyun-Joo Han、Eun-Kyung Chung
DOI:10.1016/s0040-4039(01)01719-1
日期:2001.11
The magnitude of the α-effect for reactions of 4-nitrophenyl substituted benzoates with a pair of anionic nucleophiles is independent of the electronic nature of the acyl substituent, while the one for the corresponding reactions with a pair of neutral nucleophiles increases as the acyl substituent changes from a strong electron withdrawing substituent to electron donating ones.
4-硝基苯基取代的苯甲酸酯与一对阴离子亲核试剂反应的α效应强度与酰基取代基的电子性质无关,而与一对中性亲核试剂进行相应反应的α效应随酰基取代基的增加而增加从强吸电子取代基转变为给电子取代基