Palladium(II)-N-Heterocyclic Carbene Metallacrown Ether Complexes: Synthesis, Structure, and Catalytic Activity in the Suzuki-Miyaura Reaction

被引：92

作者：

Zhang, Xiaoqin ^{[1
]}

Qiu, Yuping ^{[1
]}

Rao, Bin ^{[1
]}

Luo, Meiming ^{[1
]}

机构：

[1] Sichuan Univ, Coll Chem, Minist Educ, Key Lab Green Chem & Technol, Chengdu 610064, Peoples R China

来源：

ORGANOMETALLICS | 2009年 / 28卷 / 10期

基金：

中国国家自然科学基金;

关键词：

N-HETEROCYCLIC CARBENES; RAY CRYSTAL-STRUCTURES; CROSS-COUPLING REACTIONS; GROUP-6; METAL-CARBONYLS; DONOR-CROWN-ETHER; CHELATING PHOSPHINITE COMPLEXES; CIS-TRANS ISOMERIZATION; PALLADIUM COMPLEXES; PHOSPHORUS-DONOR; CATION-BINDING;

D O I：

10.1021/om8011695

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Pd(II)-N-heterocyclic carbene (NHC) metallacrown ether complexes have been synthesized for the first time. Reaction of bis(imidazolium) salts with a long polyether chain with Ag2O afforded silver-NHC complexes [Ag-2(L)Cl-2] 5, which reacted as carbene transfer reagents with palladium salts to give Pd(II)-NHC metallacrown ether complexes 6a,b. The Ag(I)-NHC complex 5b possesses a one-dimensional chain configuration by each Ag(I) center coordinated to one carbene and two bridging chlorides. Each of Pd(II)-NHC metallacrown ether complexes 6a,b contains a 25-membered macrocyclic NHC metallacrown ether formed by a bidentate chelate bis(carbene) ligand with a long flexible linkage and a Pd(II). The coordination geometry on the Pd(II) is approximately square planar. Pd(II)-NHC metallacrown ether complexes 6a and 6b have been shown to be highly effective in the Suzuki-Miyaura reactions of a variety of aryl bromides in neat water without the need of inert gas protection.

引用

页码：3093 / 3099

页数：7

共 110 条

[1] RHODIUM PHOSPHINOETHER COMPLEXES .1. CRYSTAL AND MOLECULAR-STRUCTURES OF TRANS-[1,5-BIS(DIPHENYLPHOSPHINO)-3-OXAPENTANE-O,P,P']-CARBONYLRHODIUM(I) HEXAFLUOROPHOSPHATE AND TRANS-AQUA[1,11-BIS-(DIPHENYLPHOSPHINO)-3,6,9-TRIOXAUNDECANE-P,P']CARBONYLRHODIUM(I) HEXAFLUOROPHOSPHATE [J].