Palladium-Catalyzed Syntheses of Polyethynyl-Substituted 2,2?-Bithiophenes
作者:Uwe Dahlmann、Richard Neidlein
DOI:10.1002/hlca.19960790318
日期:1996.5.8
syntheses of polyethynyl-substituted 2,2′-bithiophenes 2 and related 5,5′-dicarbaldehyde derivatives 1 are described. The treatment of easily available polybrominated 2,2′-bithiophenes 3 and 2,2′-bithiophene-5,5′-dicarbaldehydes 4 with phenyl or (trimethylsilyl)acetylene in the presence of PdII and CuI in (i-Pr)2NH yields substituted polyethynyl-2,2′-bithiophene compounds. The Me3Si protecting groups