文献类型：期刊文献

英文题名：Highly selective trimerization of ethylene with half-sandwich cyclopentadienyl and indenyl titanium complexes bearing pendant thienyl group

作者：Zhang, Yanlu[1];Wang, Chen[1];Wu, Tianzhi[1];Ma, Haiyan[1];Huang, Jiling[1]

机构：[1]E China Univ Sci & Technol, Lab Organometall Chem, Shanghai 200237, Peoples R China

年份：2014

卷号：387

起止页码：20

外文期刊名：JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL

收录：;EI(收录号：20141317506471);WOS:【SCI-EXPANDED(收录号:WOS:000335633400003)】；

基金：We gratefully acknowledge financial support from the National Natural Science Foundation of China (No. 20372022) and National Basic Research Program of China (2005CB623801).

语种：英文

外文关键词：Titanium; Thienyl; Cyclopentadienyl; Indenyl; Ethylene trimerization

摘要：A series of half-sandwich titanium complexes bearing thienyl group [Cp(Ind)-bridge-thienyl]TiCl3 (CS1-CS10) have been synthesized and show high selective ethylene trimerizaion to 1-hexene. The molecular structure of CS8 [Ind-C(cyclo-C5H10)-(5-Me-thienyl)]TiCl3 was confirmed by X-ray. No intramolecular coordination interaction between the sulfur atom on the thienyl group and the titanium center could be observed in the solid state of these complexes. After activated with MAO, the complexes can effectively catalyze ethylene trimerization. For [Cp-bridge-thienyl]TiCl3/MAO system, the best productivity is obtained at 30 degrees C; increasing the bulk of the substituent on the 5-position of the thienyl can improve the productivity for 1-hexene. CS6 [Cp-C(cyclo-C5H10)-(5-SiMe3-thienyl)]TiCl3 upon with MAO can make a productivity of 553 kg/(mol Ti-h) and 1-hexene selectivity of 86% at 30 degrees C, 0.5 MPa ethylene pressure. For [Ind-bridge-thienyl] TiCl3/MAO system, catalysts have more active and more tolerant of temperature comparing to corresponding Cp complexes. For example, CS8 can make the productivity of 697 kg/(mol Ti-h) and 1-hexene selectivity of 95% at 80 degrees C, 0.5 MPa ethylene. (C) 2014 Elsevier B.V. All rights reserved.