Journal
TETRAHEDRON
Volume 66, Issue 29, Pages 5451-5458Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2010.05.026
Keywords
Pyrazolyl-based phosphine ligands; Palladium complex; Cross-coupling reaction; Stille, Kumada, Hiyama
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Funding
- IACS, India
- CSIR, India
- Syngene International Ltd., Bangalore, India
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Combination of 3,5-dimethyl-1-(2-(diphenylphosphino)phenyl)-1H-pyrazole, A, and 3-tert-butyl-5-methyl-1-(2-(diphenylphosphino)phenyl)-1H-pyrazole, B, with Pd-2(dba)(3) furnished excellent catalysts for Stille, Kumada and Hiyama cross-coupling reactions. Effects of solvents, bases and ligand/palladium ratio on efficiency of coupling reactions were studied. Molecular structures of palladium(II) complexes of A and B determined by single-crystal X-ray diffraction method revealed a close similarity of ligand arrangement around the metal centre. (C) 2010 Elsevier Ltd. All rights reserved.
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