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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, 3,4,5,6,7,8,9octahydrocycloocta[b]thiophenes 7a,b were formed in good yield, accompanied by loss of isobutene. Scheme 1 If alkyl groups other than tert-butyl are attached to the sulfur (or selenium) atom, elimination Issue in Honor of Prof. Fritz Sauter ARKIVOC 2001 (ii) 135-138 We wondered whether a cyclic alkyne, being activated by ringdoi:10.3998/ark.5550190.0002.215 fatcat:s72hzmiflnbqhbrd4ytivwg3he