Issue 20, 2004

Palladium(ii) complexes of new OPN phosphine ligands and their application in homogeneously catalysed reactions of CO with alkenes or alkynes

Abstract

Palladium complexes of a series of functionalised phosphines bearing the OPN donor set [2-pyCH2P(Ph)CH2(CHOCH2CH2CH2), 1; 2-py CH2P(Ph)–CH2CH2(CHOCH2CH2O), 2; 2-pyCH2P(Ph)CH2CH2CO2Me, 3; 2-pyP(Ph)CH2(CHOCH2CH2CH2), 4; 2-py = 2-pyridyl] have been prepared and characterised. Ligands 13 form five membered P–N chelates which is confirmed for PdCl2 complexes of 1 and 3 by X-ray crystallography. O-coordination appears to be generally disfavoured although there is evidence of transient O-coordination for selected Pd complexes of 4. Palladium methyl and acetate complexes of all four ligands have been tested for catalytic activity in ethene/CO copolymerisation as well as alkoxy-carbonylation of propyne. Complexes of 1 and 4 show some activity in the copolymerisation reaction and complexes of 4 are active in the methoxy carbonylation of propyne. Unlike related pyridyl(diaryl)phosphines, 4 produces a much more stable catalyst system that does not require large excesses of ligand to maintain activity.

Graphical abstract: Palladium(ii) complexes of new OPN phosphine ligands and their application in homogeneously catalysed reactions of CO with alkenes or alkynes

Article information

Article type
Paper
Submitted
14 Apr 2004
Accepted
28 Jul 2004
First published
31 Aug 2004

Dalton Trans., 2004, 3251-3260

Palladium(II) complexes of new OPN phosphine ligands and their application in homogeneously catalysed reactions of CO with alkenes or alkynes

M. J. Green, K. J. Cavell, P. G. Edwards, R. P. Tooze, B. W. Skelton and A. H. White, Dalton Trans., 2004, 3251 DOI: 10.1039/B405586C

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