National Changhua University of Education Institutional Repository : Item 987654321/18879
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题名: Copolymerization of Carbon Monoxide with Ethene Catalyzed by Bis-palladium (II) Complexes Containing Diphosphine and Dinitrogen Ligands
作者: Claudio Bianchini;Lee, Hon Man;Pierluigi Barbaro;Andrea Meli;Simonetta Moneti;Francesco Vizza
贡献者: 化學系
日期: 1999
上传时间: 2014-08-14T04:28:31Z
出版者: Royal Society of Chemistry
摘要: Several bis-chelated palladium(II) complexes, [Pd(P-P)(N-N)x](PF6)2, containing binary combinations of diphosphine and dinitrogen ligands have been prepared and characterized. The diphosphine ligands comprise 1,3-bis(diphenylphosphino)propane (dppp), meso-2,4-bis(diphenylphosphino)pentane (meso-bdpp), rac-2,4-bis(diphenylphosphino)pentane (rac-bdpp) and 2,2′-bis(diphenylphosphinoethyl)pentane (Etdppp), while the dinitrogen ligands are either 2,2′-bipyridine (bipy; x=1) or 1,8-naphthyridine (napy; x=2). The structure of [Pd(meso-bdpp)(N,N′-bipy)](PF6)2·CH2Cl2 has been determined by an X-ray structural analysis. All the Pd(II) complexes have been tested as catalyst precursors for the copolymerization of carbon monoxide and ethene in methanol solution in either autoclaves or high-pressure sapphire NMR tubes. The combination of meso-bdpp and bipy at palladium, in conjuction with both 1,4-benzoquinone and p-toluenesulfonic acid, has shown the best catalytic performance. The different catalytic activities exhibited by the stereoisomers [Pd(meso-bdpp)(N,N′-bipy)]- (PF6)2 and [Pd(rac-bdpp)(N,N′-bipy)](PF6)2 has been interpreted in terms of the different spatial distribution of the phenyl rings around the metal center determined by the conformation of the six-membered metallaring.
關聯: New Journal of Chemistry, 23(9): 929-938
显示于类别:[化學系] 期刊論文

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