1,2-Asymmetric induction in reactions of nonconjugated acyclic radicals: a new model for highly selective atom-transfer reactions of alkyl-substituted radicals
作者:Gebhard Thoma、Dennis P. Curran、Steven V. Geib、Bernd Giese、Wolfgang Damm、Frank Wetterich
DOI:10.1021/ja00072a010
日期:1993.9
selective product formation due to 1,2-asymmetricinduction. The level of diasterselectivity depends on the size of the alkyl substituent on the radical. Tertiary alkyl groups give high syn selectivity, secondary groups lead to a moderate syn selectivity, and primary groups show completely unselective reactions. To explain the stereochemical outcome, a new steric model of the 1 Bu-substituted radical
据报道,甲基碘代丙二腈 (1) 通过碘转移加成到几种二烷基取代的烯烃上。由于 1,2-不对称诱导,碘转移反应到无环非共轭自由基中间体通常会导致选择性产物形成。非对映选择性的水平取决于基团上烷基取代基的大小。叔烷基产生高顺式选择性,仲基产生中等顺式选择性,伯基显示完全非选择性反应。为了解释立体化学结果,基于 AM1 计算和 EPR 数据引入了 1 Bu 取代基 5e 的新空间模型
Mechanistic studies of atom transfer addition reactions of iodomalononitriles to alkenes. 1,2-asymmetric induction in an iodine atom transfer reaction.
作者:Dennis P. Curran、Gebhard Thoma
DOI:10.1016/0040-4039(91)80154-x
日期:1991.10
An unusual stereoselective iodine transfer to a benzylic radical helps to show that atom transfer additions of iodomalononitriles to alkenes occur by a radical mechanism.
不常见的立体选择性碘转移至苄基自由基有助于表明碘自由基通过自由基机理转移到碘代烯腈中。
Synthesis of the first crystalline thiaanthracenes, 9-cyano- and 9-(ethoxycarbonyl)-10-methyl-10-thiaanthracenes and their reactions with electrophiles