Chemistry of acetylenic ethers 102: Reaction of di(1‐alkynyl) sulfides with sodium sulfide, selenide and telluride. Formation of 1,4‐dithiins, 1,4‐thiaselenins and 1,4‐thiatellurins

Abstract Interaction between di(1‐alkynyl) sulfides ( 1 ) and sodium sulfide, selenide or telluride in mixtures of liquid ammonia and methanol or dimethylformamide and methanol gives 1,4‐dithiins ( 2 ), 1,4‐thiaselenins ( 3 ) and 1,4‐thiatellurins ( 4 ).