Paracyclophane (1) is a pivotal structure among the [m.m]paracyclophanes. It is intermediate in ring size between [2.2] paracyclophane, where ring strain and transannular effects are pronounced, and [4.4] paracyclophane, where these effects are absent.1 While some chemical and physical studies

No abstract

Moritani for their invaluable sug-gestions in this work, and they are also indebted to the Ministry of Education for the partial financial support of this research.

It is curious that among the diverse alkyland aryl-substituted cyclopropene hydrocarbons, 1,2-diarylcyclopropenes are completely unknown (I.). Attempts to prepare the Simplest cyclopropene of this type, 1,2-diphenylcyclopropene (I), have been singularly unsuccessful (2); moreover, an incidental reaction which l.l:cely generates I has not led to isolation of the compound (3). Hydride reduction of diphenylcyclopropenyl cation (II), an obvious route to I, affords only 1,2,4,5-tetraphenylbenzene (III) when the reduction is carried out in the usual manner (2af. We have offered evidence (2a) which indicates that in such reductions, III arises from the reaction of I, as generated, with cation II (4). With the icnowledge of this mode of reaction for I we have ex

No abstract