1448592-05-9Relevant academic research and scientific papers
Direct observation of a cationic ruthenium complex for ethylene insertion polymerization
Camacho-Fernandez, Miguel A.,Yen, Max,Ziller, Joseph W.,Guan, Zhibin
, p. 2902 - 2906 (2013)
We report here the first direct observation of a cationic ruthenium complex catalyzing ethylene insertion polymerization. An arene-tethered ruthenium complex (η6-C6H5(CH2) 3SCH3RuCl2) (3) was synthesized and shown to be able to catalyze ethylene polymerization upon activation with AlMe 2Cl. For mechanistic studies, we synthesized the homologous dimethylated η6-C6H5(CH2) 3SCH3Ru(CH3)2 (4) complex, which upon activation with the Brookhart acid ([H(Et2O)2] + [BAr′4]-) was also active for ethylene insertion polymerization. 1H-NMR and mass spectrometry (MS) studies provide direct evidence for a ruthenium cationic [η6-C 6H5(CH2)3SCH3Ru(oligomer) ]+ complex as the active species during polymerization. This has unambiguously shown for the first time a ruthenium complex as the active species for catalyzing olefin insertion polymerization.
