文献类型：期刊文献

英文题名：Substituent effect on oligomerization of isoprene catalyzed by ring-substituted (RCp)₂TiCl₂/i-C₃H₇MgCl system

作者：Tao, XC; Qian, F; Yong, L; Qian, YL

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

年份：2000

卷号：156

期号：1-2

起止页码：121

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

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000087526500010)】；

语种：英文

外文关键词：substituent effect; oligomerization of isoprene; catalysis; ring-substituted titanocene

摘要：Using the catalyst system composed of Cp2TiCl2 and i-C3H7MgCl, isoprene can be oligomerized to a mixture of dimers and higher oligomers. The two dimers 2,6-dimethyl-1, trans-3,6-octatriene and 3,6-dimethyl-1,3,6-octatriene were characterised by GC-MS; H-1-NMR; C-13-NMR and GC-IR. The effects of reaction time, molar ratio of catalyst to isoprene, temperature and solvent on the reaction were discussed. After established the appropriate reaction condition, the substituent effect of a series of alkyl ring-substituted cyclopentadienyl titanium dichlorides on catalystic activity were investigated. A mechanism of the reaction was also proposed. (C) 2000 Elsevier Science B.V. All rights reserved.