(4+2) TYPE CYCLOADDITIONS OF CYCLOHEPTATRIENYLIDENE TO ANTHRACENE AND 1,3-DIPHENYLISOBENZOFURAN
作者:Katsuhiro Saito、Yoichi Omura、Toshio Mukai
DOI:10.1246/cl.1980.349
日期:1980.3.5
Addition reactions of cycloheptatrienylidene (1) with anthracene (2) and 1,3-diphenylisobenzofuran (3) gave (4+2) type adducts (4, 5, and 6) and a heptafulvene derivative (7). The reaction mechanisms for these cycloadditions are described.
Reactions of Tropone Tosylhydrazone Sodium Salt with 2-Pyrone Derivatives: Nucleophilic Addition of 1,2,4,6-Cycloheptatetraene to 2-Pyrone Derivatives
作者:Katsuhiro Saito、Hiraku Ishihara
DOI:10.1246/bcsj.60.4447
日期:1987.12
The reaction of tropone tosylhydrazone sodium salt with 3- or 5-methoxycarbonyl-2-pyrones afforded benzotropilidene derivatives. These products are considered to be formed via addition reactions of the 2-pyrone derivatives with 1,2,4,6-cycloheptatetraene derived from cycloheptatrienylidene, which is the initial product of the decomposition of tropone tosylhydrazone sodium salt.
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
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.
Reactions of tropone derivatives and 8,8-dicyanoheptafulvene with a tautomeric mixture of cycloheptatrienylidene and 1,2,4,6-cycloheptatetraene afforded [4+2]-type cycloadducts.
Addition of cycloheptatrienylidene and diphenylcyclopropenylidene to tetracyclones
作者:Tsutomo Mitsuhashi、W. M. Jones
DOI:10.1039/c39740000103
日期:——
Addition of cycloheptatrienylidene to tetracyclones gives the benzocycloheptatrienes (9) and (10) arising from the intermediates (5) and (7) which are believed to equilibrate through the bis-norcaradiene (6); addition of 2,3-diphenylcyclopropenylidene gives products that would be expected of 1,4-addition of the carbene to the diene system.