A sterically demanding nucleophilic carbene: 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene). Thermochemistry and catalytic application in olefin metathesis

被引：288
|
作者：
Jafarpour, L [1 ]
Stevens, ED [1 ]
Nolan, SP [1 ]
机构：
[1] Univ New Orleans, Dept Chem, New Orleans, LA 70148 USA
来源：
JOURNAL OF ORGANOMETALLIC CHEMISTRY | 2000年 / 606卷 / 01期
基金：
美国国家科学基金会;
关键词：
nucleophilic carbene; thermochemistry; olefin metathesis;
D O I：
10.1016/S0022-328X(00)00260-6
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The sterically demanding nucleophilic carbene ligand 1,3-bis(2,6-diisopropylphenyl)imidazol-2 (IPr, 4) has been synthesized. The reaction of [Cp*RuCl](4) (5; Cp* = eta*-C5Me5) with this ligand affords a coordinatively unsaturated Cp*Ru(IPr)Cl (6) complex. Solution calorimetric results in this system provide information concerning the electron donor properties of the carbene ligand. Steric parameters associated with this ligand are determined from the X-ray crystal structure study. The carbene ligand reacts with RuCl2(=C(H)Ph)(PCy3)(2) (1) to yield a mixed carbene-phosphine ruthenium complex RuCl2(=C(H)Ph)(IPr)(PCy3) (9). A single-crystal X-ray diffraction study has been performed on 9. The thermal stability of 9 has been studied at 60 degrees C and its catalytic activity has been evaluated for the ring closing metathesis of diethyldiallylmalonate. (C) 2000 Elsevier Science S.A. All rights reserved.
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收藏
页码：49 / 54
页数：6
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