Paper
Palladium complexes of 2-pyridin-2-yl substituted 1,3-bis(diphenylphosphino)propane: Highly active catalysts for the room-temperature copolymerization of carbon monoxide with ethene
Published Sep 6, 2002 · S. Doherty, E. Robins, M. Nieuwenhuyzen
Organometallics
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Abstract
The 2,2‘-disubstituted 1,3-bis(diphenylphosphino)propane derivatives [XC(Me)(CH2PPh2)2] (X = 2-py, 1a; X = CH2OMe, 1b; X = Ph, 1c) and their corresponding palladium complexes [(P−P)PdCl2] (2a−c), [(P−P)Pd(OAc)2] (3a−c), [{2-methyl-2-pyridin-2-yl-1,3-bis(diphenylphosphino)propane}PdClMe] (4a), and [{(S)-(+)-N,N-dimethyl-α-methylbenzylamine-C,N}Pd{2-MeOCH2CMe(CH2PPh2)2}][ClO4] (5b) have been prepared and characterized. Palladium(II) complexes of 2-methyl-2-pyridin-2-yl-1,3-bis(diphenylphosphino)propane (1a) are highly active for the room-temperature copolymerization of ethene and carbon monoxide and, under our conditions, markedly more active than systems based on 1,3-bis(diphenylphosphino)propane (dppp), 1b and 1c. Catalysts formed from dppp, 1b, and 1c all show the expected increase in activity at elevated temperature (90 °C), while that formed from 1a is highly temperature-sensitive and rapidly decomposes.
Palladium complexes of 2-methyl-2-pyridin-2-yl-1,3-bis(diphenylphosphino)propane (1a) show high activity for room-temperature copolymerization of ethene and carbon monoxide, but are highly temperature-sensitive
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