A. Menzek et M. Balci, CYCLOADDITION REACTIONS OF SUBSTITUTED CYCLOHEPTATRIENES WITH BENZYNEAND QUINONES - AN ENTRY TO THE SUBSTITUTED BENZHOMOBARRELENES, Tetrahedron, 49(27), 1993, pp. 6071-6078
Two cycloheptatriene derivatives 8 and 9 react with benzyne to give ad
ducts 10-12 having anti benzhomobarrelene geometry. On the other hand,
cycloaddition reactions of benzoquinone and homobenzoquinone 16 with
cycloheptarienes 1 and 8 resulted in the exclusive formation of 13, 17
and 18, respectively.. The endo-configuration of benzoquinone ring in
13 was confirmed by photochemical (2+2)-cycloaddition to give the cag
e-molecule 15.