Reaction of dichloroketene and sulfene with N,N-disubstituted 6-aminomethylene-5,6,8,9-tetrahydro-7H-benzocyclohepten-7-ones. Synthesis of 5H-benzo(5,6)cyclohepta(2,1-b)pyran and 5H-benzo(5,6)cyclohepta(1,2-e)-1,2-oxathiin derivatives.

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