The reaction of phenacylsulfonylacetic acid methyl ester and styrylsulfonylacetic acid methyl ester with hydrazine hydrate gives unusual products, 1,1-dioxo-6-phenyl-1,2,4,7-tetrahydro-1λ6-[1,4,5]thiadiazepin-3-one and 1,1-dioxo-6-phenyl-1λ6-[1,4,5]thiadiazepan-3-one instead of the expected acid hydrazide.
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