Silica and polymer-tethered Pd-SCS-pincer complexes: evidence for precatalyst decomposition to form soluble catalytic species in Mizoroki-Heck chemistry

被引：175

作者：

Yu, KQ

Sommer, W

Weck, M ^{[1
]}

Jones, CW

机构：

[1] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA

[2] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA

来源：

JOURNAL OF CATALYSIS | 2004年 / 226卷 / 01期

关键词：

Heck; leaching; organometallic; silica; catalyst; pincer; palladium;

D O I：

10.1016/j.jcat.2004.05.015

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Palladium(II)-SCS-pincer complexes have been covalently immobilized on porous silica and polynorbornene supports and evaluated in the Mizoroki-Heck reaction of iodobenzene and n-butyl acrylate. Kinetic experiments and poisoning studies indicate that the pincer complexes decompose under reaction conditions via rupture of the palladium-ligand bonds to liberate active Pd(0) homogeneous species. There is no evidence for catalysis by the intact Pd(II) pincer complex under any conditions evaluated, ruling out a Pd(II)-Pd(IV) catalytic mechanism that has been postulated for palladacycle catalysts under the conditions used here. (C) 2004 Elsevier Inc. All rights reserved.

引用

页码：101 / 110

页数：10

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