Reactions of Cyclic C<sub>7</sub>H<sub>6</sub>-System: Reactions of a Tautomer of Cycloheptatetraene and Cycloheptatrienylidene with Tropone, Heptafulvene, and 1,3,5-Cycloheptatriene Derivatives
作者:Katsuhiro Saito、Satoshi Suzuki、Tetsuya Watanabe、Kensuke Takahashi
DOI:10.1246/bcsj.66.2304
日期:1993.8
Reactions of a cyclic C7H6-system, a tautomer of 1,2,4,6-cycloheptatetraene and 2,4,6-cycloheptatrienylidene, with tropone derivatives and 8,8-dicyanoheptafulvene afforded exo-[4π+2π] cycloadducts. Similar reactions with 1,3,5-cycloheptatriene derivatives gave exo-[6π+2π] cycloadducts. These reactions are considered to proceed through zwitter ionic intermediates containing tropylium ion moieties.
环状 C7H6 系统(1,2,4,6-环庚四烯和 2,4,6-环庚三亚叉的互变异构体)与托酮衍生物和 8,8-二氰基七富烯的反应得到外型-[4π+2π] 环加合物。与 1,3,5-环庚三烯衍生物的类似反应得到外型-[6π+2π] 环加合物。这些反应被认为是通过含有鎓离子部分的两性离子中间体进行的。