Organic reactions involving transition metals. Part VI. Complexes of unsaturated tertiary phosphines with palladium(II) and platinum(II), and their reactions with nucleophiles
- 1 January 1971
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 3705-3711
- https://doi.org/10.1039/j19710003705
Abstract
Palladium(II) and platinum(II) complexes of the ligands CH2:CH·[CH2]n·PPh2(n= 1,2,3) have been investigated. The but-3-enylphosphine chelates to palladium or platinum, the pent-4-enylphosphine chelates only to platinum, and the allylphosphine chelates to neither metal. The but-3-enyl complexes of platinum react with methoxide or acetate ion, and the pent-4-enyl complexes react with methoxide ion, to give predominant addition of the nucleophile to the β-carbon atom, [[graphic omitted]tX]2(n= 2,3, X = Cl, R = Me; n= 2, X = CO2Me, R = Ac). Carboxylate ions (CH2Y·CO2 –, Y = H, Cl, F) displace the co-ordinate double bond of the pent-4-enyl complex from the metal to give the carboxylate-bridged dimers {CH2:CH·[CH2]3PPh2Pt(O2C·CH2Y)2}2. The complexes are characterised by bridge-splitting reactions and by i.r. and n.m.r. spectroscopy.Keywords
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