The Estimation of the Electronic Effects of Cyclopropyl and 2,2-Dichlorocyclopropyl Groups
作者:Yoshiaki Kusuyama、Yoshitsugu Ikeda
DOI:10.1246/bcsj.46.204
日期:1973.1
The normal substituent constant, σ0, and the resonance substituent constant, Δ\barσR+, in the Yukawa and Tsuno treatment of cyclopropyl and 2,2-dichlorocyclopropyl were determined by the ionization of m-, p-substituted phenylacetic acids in 50% aqueous ethanol and by the solvolysis of α-(m-, p-substituted phenyl) ethyl chlorides in 80% aqueous acetone. For cyclopropyl, the obtained σ0 value indicates
环丙基和 2,2-二氯环丙基的 Yukawa 和 Tsuno 处理中的正常取代基常数 σ0 和共振取代基常数 Δ\barσR+ 是通过在 50% 乙醇水溶液中电离 m-、p-取代的苯乙酸来确定的并通过在 80% 丙酮水溶液中溶解 α-(间,对位取代苯基)乙基氯。对于环丙基,得到的σ0值表明具有感应吸电子行为,而Δ\barσR+值表明与烷基相比,对缺电子反应中心的电子释放共振效应显着增强。观察到 2,2-二氯环丙基的轻微共振贡献。