β-deuterium kinetic isotope effects in the solvolysis of 2-aryl-1,1,1-trifluoro-2-propyl tosylates and of 2-aryl-2-profyl -nitrobenzoates. Evidence for a variation of the contribution of α-methyl substituent in stabilizing cationic reaction centers with different electron demand
作者:Kwang-Ting Liu、Yuh Wern Wu
DOI:10.1016/s0040-4039(00)84865-0
日期:1986.1
A very high β-deuterium kinetic isotope effect, k(CH3)/k(CD3) = 2.13 at 60°C, was found for the solvolysis of 2-(3′-chlorophenyl)-1,1,1-trifluoro-2-propyl tosylate () and the α-CD3 analogue (), and the effect decreased with increasing electron attracting of the substituent on the aromatic ring which showed the variation of the contribution of α-methyl group to the stabilization of the cationic reaction
发现在60°C时有非常高的β-氘动力学同位素效应k(CH 3)/ k(CD 3)= 2.13,用于2-(3'-氯苯基)-1,1,1-三氟的溶剂分解-2-丙基甲苯磺酸酯()和α-CD 3类似物(),和效果与芳香族环,其表明α-甲基的贡献的变化与阳离子的稳定化上增加吸电子取代基的下降反应中心处于过渡状态。