Abstract

The title compounds 1a,b being α-acceptor-substituted tert-butyl vinylsulfides add to cyclooctyne; upon warming dioxane solutions of 1a,b for two days 2,3,4,5,6,7,8,9- octahydrocycloocta(b)thiophenes 7a,b were formed in good yield, accompanied by loss of isobutene.

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