The Substituent Effect. XII. Solvolysis of 3′- and 4′-Substituted 1-(4-Biphenylyl)ethyl Chlorides
作者:Yuho Tsuno、Wei-Yuen Chong、Yoshihiko Tairaka、Masami Sawada、Yasuhide Yukawa
DOI:10.1246/bcsj.51.596
日期:1978.2
Rate constants of solvolysis of 3′- and 4′-substituted 1-(4-biphenylyl) ethyl chlorides were measured in 80% (v/v) aqueous acetone. The effect of substituents could be correlated excellently with the LArSR relationship.log k⁄k0=−1.56(σ0+0.84Δ\barσR+)The ρ and r+ values are smaller than those in the corresponding phenyl system under identical conditions (ρ=−4.95, r+=1.15). The difference of the r+ values
在 80% (v/v) 丙酮水溶液中测量 3'- 和 4'-取代的 1-(4-联苯基) 乙基氯的溶剂分解速率常数。取代基的影响可以与LArSR关系很好地相关。log k⁄k0=−1.56(σ0+0.84Δ\barσR+) ρ和r+值小于相同条件下相应苯基体系中的值(ρ=−4.95 , r+=1.15)。r+ 值的差异解释为两个苯基围绕联苯中的枢轴键的扭曲。相同的处理方法已成功应用于其他反应性数据集;溶剂分解、原脱甲硅烷化、碱水解和哌啶脱溴。结果表明,在所有研究的反应中,联苯基中的π电子传输的有效性相对于苯基体系始终降低。