Distinct Reactivity of Mono- and Bis-NHC Silver Complexes: Carbene Donors versus Carbene-Halide Exchange Reagents

被引：54

作者：

Hintermair, Ulrich ^{[1
]}

Englert, Ulli ^{[2
]}

Leitner, Walter ^{[1
]}

机构：

[1] Rhein Westfal TH Aachen, Inst Tech & Makromol Chem, D-52074 Aachen, Germany

[2] Rhein Westfal TH Aachen, Inst Anorgan Chem, D-52074 Aachen, Germany

来源：

ORGANOMETALLICS | 2011年 / 30卷 / 14期

关键词：

N-HETEROCYCLIC CARBENES; IONIC LIQUID; IRIDIUM; VERSATILE; LIGANDS; RHODIUM;

D O I：

10.1021/om101056y

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The synthesis of N-heterocyclic carbene (NHC) complexes of silver is an established technique for their use as carbene transfer reagents. While it is known that both mono-NHC Ag(I) and bis-NHC Ag(I) complexes are accessible, different reactivities of these species have not been explored synthetically. Whereas the commonly used mono-NHC Ag(I) complexes act as NHC donors only, we found that a bis-NHC Ag(I) complex was capable of transferring one carbene under halide abstraction. This is exemplified in the transformation of P-Cl compounds into the respective imidazolium-phosphines by a bis-NHC Ag(I) complex but not by its corresponding mono-NHC Ag(I) complex. When the bis-NHC Ag(I) complex was allowed to react with [M(cod)Cl](2) (M = Rh, Ir), both NHCs were transferred under chloride abstraction to give [M(cod)(NHC)(2)](+) exclusively, a reaction which is reported to stop at [M(cod)Cl(NHC)] even with an excess of mono-NHC Ag(I) complex in the presence of AgPF6.

引用

页码：3726 / 3731

页数：6

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