Lithium 4-thiobutadiynides, Ethynylation, Diacetylenic Thioethers By the reaction of (3,4,4-trichloro-3-buten-1-ynyl)thioethers 2 or of (pentachloro-1,3-butadienyl)thioethers 4 with the twofold or the threefold equimolar amount of n-butyllithium the corresponding lithium butadiynides 5 are prepared. The treatment of these acetylides 5 with water, with the halides of some organyl groups or with chloral, phenylisocyanate, cyclohexyl-isothiocyanate and water furnishes the (butadiynyl)thioethers 6

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... -f and 7 a-c. The reaction of the lithium butadiynide 5 a with cyanogen bromide and morpholine leeds via the bromoacetylene 8 to the (4-morpholinobutadiynyl)phenylthioether 9.