Addition of cycloheptatrienylidene and diphenylcyclopropenylidene to tetracyclones
Abstract
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.
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