2,2′-Bithiophene and halogenated-2,2′-bithiophenes were halogenated with 2-halo-4,5-dichloropyridazin-3(2H)-one in the presence of zinc halide to give selectively the corresponding dihalo-, trihalo-, and tetrahalo-2,2′-bithiophenes involving the same or different halogens in excellent yields, respectively.
2,2'-二
噻吩和卤代-2,2'-二
噻吩在
氯化锌存在下与2-卤-4,5-二
氯吡啶噁
噻唑-3(2H)-酮卤化,选择性地生成相应的二卤、三卤和四卤-2,2'-二
噻吩,涉及相同或不同的卤素,且产率优异。