Comparative Study on Catalytic Systems for the Alternating and Nonalternating CO/Ethene Copolymerization

摘要: Drent et al. [Chem. Commun. 2002, 9, 964] have recently shown that a neutral (P−O)Pd(II) catalyst based on o-alkoxy derivatives of diphenylphosphinobenzene sulfonic acid (1a) can perform nonalternating CO/C2H4 copolymerization in which the resulting polyketone one or more subsequent ethylene units. We analyzed this by comparing it to cationic palladium catalyst, [(P−P)Pd(II)+] (1c), (P−P) = dppp Ph2P−(CH2)3−PPh2, affords polyketones with strictly alternating CO and C2H4 also investigated derivative (1b) 1a o-methoxy substituents were replaced o-isopropyl group order investigate whether increasing steric bulk enhances degree nonalternation.