Stereochemical aspects of the free radical addition of methanethiol to 4-t-butylcyclohexene
作者:E.S. Huyser、J.R. Jeffrey
DOI:10.1016/s0040-4020(01)96928-5
日期:1965.1
greater than the equatorially substituted isomers. The stereochemical control observed in this free radical addition reaction is proposed to be the result of the conformational factors encountered in the addition of the methanethiyl radical to the double bond of 4-t-butylcyclohexene. The role of the reversibility of the addition of thiyl radicals to 4-t-butylcyclohexene is discussed in terms of the stereospecificity
将光化学诱导的甲硫醇加到4-叔丁基环己烯中得到四种异构体硫化物,即顺式和反式4-叔丁基环己基甲基硫化物和顺式和反式3-叔丁基环己基甲基硫化物的混合物。不太稳定的轴向取代的异构体,顺式4-叔丁基环己基甲基硫化物和反式形成的3-叔丁基环己基甲基硫的量是赤道取代的异构体的五至七倍。在该自由基加成反应中观察到的立体化学控制被认为是在甲基叔丁基加到4-叔丁基环己烯双键中所遇到的构象因素的结果。根据在这些加成反应中指出的立体特异性,讨论了将巯基加成至4-叔丁基环己烯的可逆性的作用。