Xiao-Yan Tang, Yong-Xia Wang, Bai-Xiang Li, Jing-Yu Liu and Yue-Sheng Li Highly efficient ethylene/norbornene copolymerization by o-Di(phenyl)phosphanylphenolate-based half-titanocene complexes Journal of Polymer Science Part A: Polymer Chemistry 51
A series of o-di(phenyl)phosphanylphenolate-based half-titanocene complexes CpTiCl2[O-2-R1-4-R2-6-(Ph2P)C6H2] have been synthesized. Surprisingly, notable improvements in the catalytic activity were observed if introducing norbornene (NBE) into the system, and catalytic activity was more than 100 times larger than that of ethylene homopolymerization in the case of Ph3CB(C6F5)4/iBu3Al as cocatalyst. By carrying out DFT calculations, the active species is predicted and the role of NBE is identified.
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