| 15483709 |
Green MJ, Cavell KJ, Edwards PG, Tooze RP, Skelton BW, White AH: Palladium (II) complexes of new OPN phosphine ligands and their application in homogeneously catalysed reactions of CO with alkenes or alkynes. Dalton Trans. 2004 Oct 21;(20):3251-60. Epub 2004 Aug 31.
Palladium complexes of a series of functionalised phosphines bearing the OPN donor set [2-pyCH (2) P (Ph) CH (2)(CHOCH (2) CH (2) CH (2)), 1; 2-py CH (2) P (Ph)-CH (2) CH (2)(CHOCH (2) CH (2) O), 2; 2-pyCH (2) P (Ph) CH (2) CH (2) CO (2) Me, 3; 2-pyP (Ph) CH (2)(CHOCH (2) CH (2) CH (2)), 4; 2-py = 2-pyridyl] have been prepared and characterised. Ligands 1-3 form five membered P-N chelates which is confirmed for PdCl (2) complexes of and 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. |
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