Abstract
Metallation of the acetylenes MeCCR (R = CC–SiMe3, CCMe, CC–Sme, CC–Nalkyl2, S–CCSiMe3, S–CC–Me) with BuLi·ButOK, followed by the successive addition of carbon disulphide, t-butyl alcohol, and hexamethylphosphoric triamide gives thieno[2,3,-b]thiophene, thieno-1,4-dithi-ine, and some of their derivatives in reasonable yields.
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More From: Journal of the Chemical Society, Chemical Communications
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