期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 265, 期 1-2, 页码 292-305出版社
ELSEVIER
DOI: 10.1016/j.molcata.2006.10.035
关键词
copolymerization; palladium; 1,2-bis(di(2-methoxyphenyl)phosphino)ethane; 1,3-bis(di(2-methoxyphenyl)phosphino)propane; 2,2,2-trifluoroethanol
Neutral and bis-cationic palladium(H) complexes with 1,2-bis(di(2-methoxyphenyl)phosphino)ethane (o-MeO-dppe) and 1,3-bis(di(2-methoxyphenyl)phosphino)propane (o-MeO-dppp) have been synthesized and employed to catalyze the CO-ethylene copolymerization reaction in either protic or aprotic solvents. A comparison of the catalytic performance of these complexes with that of analogous precursors stabilized by 1,2-bis(diphenylphosphino)ethane (dppe) and 1,3-bis(diphenylphosphino)propane (dppp) ligands has shown significant differences in terms of catalytic productivity and molecular weight. In situ and operando high-pressure NMR experiments have provided valuable information on catalysis resting states and intermediates and have contributed to rationalize the observed productivity as well. (c) 2006 Elsevier B.V. All rights reserved.
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