Acetylenic thiophens, ArC⋮CR (Ar = 2,2′-bithienyl-5-yl or 2-thienyl), have been prepared by a metal-catalysed Grignard coupling reaction, either from ArMgl and BrC⋮CR or from Arl and BrMgC⋮CR; the second method gave the better results. Some side-reactions are discussed.
D. Brown, J. C. Craig, N. H. Dyson and J. W. Westley, J. Chem. Soc. C, 1966, 89 DOI: 10.1039/J39660000089
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