The chemistry of ortho-benzoquinones. Part II. Reaction with tetraphenylcyclopentadienone

Abstract
Tetrachloro-1,2-benzoquinone reacts with tetracyclone to yield a cyclopenta[b][1,4]benzodioxinone. A similar product was obtained in low yield from the reaction of 1,2-benzoquinone and tetracyclone, along with an ethenoindanetrione. In these reactions tetracyclone behaves, unexpectedly, as a dienophile.

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