Heck reaction in ionic liquids and the in situ identification of N-heterocyclic carbene complexes of palladium

被引：464

作者：

Xu, LJ ^{[1
]}

Chen, WP ^{[1
]}

Xiao, JL ^{[1
]}

机构：

[1] Univ Liverpool, Dept Chem, Leverhulme Ctr Innovat Catalysis, Liverpool L69 7ZD, Merseyside, England

来源：

ORGANOMETALLICS | 2000年 / 19卷 / 06期

关键词：

D O I：

10.1021/om990956m

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The Heck reaction was found to proceed markedly more efficiently in the ionic liquid 1-butyl-3-methylimidazolium bromide ([bmim][Br]) than in the analogous tetrafluoroborate salt ([bmim][BF4]). In relation to this observation, 1-butyl-3-methylimidazol-2-ylidene (bmiy) complexes of palladium [PdBr(mu-Br)(bmiy)](2) (1) and [PdBr2(bmiy)(2)] (2) have been isolated in [bmim][Br] but not in [bmim][BF4] under conditions similar to those employed for the Heck reaction. In both the ionic liquid [bmim][Br] and molecular solvents, complex 2 was formed via the intermediate 1. 2 has been shown to be active in the Heck reaction in [bmim][Br] but much less so in [bmim][BF4] due to transformation by the latter into less active species.

引用

页码：1123 / 1127

页数：5

共 57 条

[1] Stereoselective hydrogenation reactions in chloroaluminate(III) ionic liquids: a new method for the reduction of aromatic compounds [J].