作者:Hideo Tomioka、Kazuo Tabayashi、Yasuji Ozaki、Yasuji Izawa
DOI:10.1016/s0040-4020(01)96384-7
日期:1985.1
and cyclohexane) and the relative rate of O—H insertion into methanol to stereospecific cyclopropanation of the olefin to C—H insertion into cyclohexane are calculated from the ratios of products and substrates. It is found (i) that the reactivities of the substrates decrease in the order of methanol, olefin and cyclohexane and (ii) that electron-donating substituents generally lead to reaction with
取代的(p -MeO,p -Me,H,p -Cl,p -Br,m-Br,m-MeO,3,4-Cl 2,p -CO 2 Me,m-CN和p -CN)单苯基卡宾在底物的二元混合物(甲醇,顺式根据产物和底物的比例,计算出-4-甲基-2-戊烯和环己烷的OH插入到甲醇中烯烃的立体定向环丙烷化和OH插入到环己烷中的相对比率。发现(i)底物的反应性按甲醇,烯烃和环己烷的顺序降低,和(ii)供电子取代基通常导致与反应性较高的底物反应,而有利于与反应性较低的底物反应。在吸电子取代基的情况下。这些结果是通过取代基改变单线芳基卡宾的亲电性而不是单线态-三重态平衡的改变来解释的。