期刊
INORGANICA CHIMICA ACTA
卷 363, 期 14, 页码 3914-3918出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2010.07.054
关键词
Binuclear; N-Heterocyclic carbene; Palladium; Heck reaction
资金
- Foundation of Xuzhou Normal University [KY2008103, KY2008104, 09XLY02, 2010YLB030]
- Jiangsu Education Committee [08QLT001, 08QLD006]
- Jilin University
- NSFC [20801047]
A series of di-NHC ligands with alkyl bridges of different chain lengths (n = 2-4) and their bi-palladium complexes (4, 5 and 6) have been prepared. The molecular structure of 4 and 6 were determined by X-ray diffraction studies. The structures of complex 4 consist of two pseudo-square-planar subunits in a trans configuration, however 6 consist of two subunits in a cis configuration with pi-pi stacking between two pyridines. The influence of the different bridges on the structure and reactivity of the complexes has been studied. The catalytic activity of the new binuclear palladium complexes was successfully tested in the Mizoroki-Heck reaction of styrene with bromobenzene. The complex with 2 and 4 carbon linker gave higher yield, while the one with 3 carbon linker gave better regioselectivity. (C) 2010 Elsevier B.V. All rights reserved.
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