Selective Halogenation of Bithiophenes Using 2-Halopyridazin-3(2H)-ones under Ambient Conditions
作者:Jong Park、Yong-Jin Yoon、Kwang-Ju Jung、Seung Kang、Ju-Eun Won、Song-Eun Park、Ki Park、Sang-Gyeong Lee
DOI:10.1055/s-0028-1087536
日期:2009.2
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.
The reactions of thiophene derivatives with benzyltrimethylammonium tetrachloroiodate, benzyltrimethylammonium tribromide, and benzyltrimethylammonium dichloroiodate in acetic acid or in acetic aci...