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

Green, Melinda J., Cavell, Kingsley J., Edwards, Peter G., Tooze, Robert P., Skelton, Brian W. and White, Allan H. 2004. Palladium(ii) complexes of new OPN phosphine ligands and their application in homogeneously catalysed reactions of CO with alkenes or alkynes. Dalton Transactions (20) , pp. 3251-3260. 10.1039/b405586c

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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 1–3 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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Subjects:	Q Science > QD Chemistry
Publisher:	RSC
ISSN:	1477-9226
Last Modified:	05 Apr 2022 08:33
URI:	https://orca.cardiff.ac.uk/id/eprint/149049

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