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Treatment of 2,4-diphenylbutadiene-1,4-sultone with hydrazine in boiling EtOH gives 1-amino- 2,4-diphenyl-1H-pyrrole. On treatment of 2,4-diphenylbutadiene-1,4 -sultone with phenyl hydrazine in glacial acetic acid, 4,5-dihydro-5-met hyl-1,3,5-triphenyl-1H-pyrazole was isolated. On the other hand, 2,4-diphenylbutadiene-1,4-sulton e reacts with 4 H-1,2,4-triazol-3-amine and 5-amino-3-phenyl-1H-pyrazole to afford the novel heterocyclic compounds 2-(2,2-dioxo-4- phenyl-3,4-dihydro-8H-2λ 6 -(1,2,4)triazolo(5,1- c)(1,2,4)thiadiazin-4-yl)-1-phenylethan-1-one, the structure of which was established by X-ray crystal lography, and 2-(2,2-dioxo-4,7-diphenyl-3,4- dihydro-6H-pyrazolo(5,1-c)(1,2,4)thiadiazin-4-yl)-1-phenylethan-1-one.

Reactions of 2,4-diphenyl-butadiene-1,4-sultone with some 1,2- and 1,3-nitrogen bi-nucleophiles