Synthesis Of The Pyridyl Derivants And Application In The Copolymerization Of CO/Styrene

The polyketones are a fascinating polymeric material with excellent properties, including mechanical property, pressure tight, high temperature resistant and bio/photo-degradation. Aliphatic polyketones are prepared by a perfectly alternating copolymerization of carbon monoxide (CO) with olefins in the presence of palladium-based catalysts. However, these catalysts are too expensive to be afforded by most chemical industries. In order to effectively lower the cost of the experiment, in this paper we studied how to synthesize novel 2,2'-bipyridyl derivatives and choose the excellent pyridyl ligands to apply in the copolymerization of carbon monoxide and styrene. The objective of our work is also to improve the catalytic activity of palladium system, and to analyze catalytic mechanism and optimal reaction condition.A series of pyridyl ligands was synthesized by 4-methylpyridine and 2,2'-bipyridine.We optimized them at the B3LYP/6-31G (d,p) level of density functional theory(DFT) with Gaussian 03 and discussed the influence of 4,4 spaces'different groups on N,N spaces'electron cloud density by Molecular Model. The study suggested that as the electronic donor of 4,4-groups are increased, the catalytic activity and the relative molecule weight increased steadily.A series of pyridyl ligands were applied in the copolymerization of carbon monoxide and styrene.The effects of molar ratios of ligands, benzoquinone, p-toluenesulfonic acid and palladium(â…¡) on the catalytic activity of the copolymerization of carbon monoxide (CO) and styrene (ST) were studied, and the influence of the amount of solvent, the press of CO, reaction temperature on this copolymerization were also investigated. The catalytic activity of a series of bident ligands was compared.