【摘要】 <正> 近年来我们用 Cp₂ TiCl₂/i-C₃ H₇ MgBr（Cp=η⁵-C₅ H₅）催化体系对非共轭双烯烃的异构化进行了一系列的研究.以1,5-环辛二烯和1,5-已二烯为模型化合物的催化异构化反应结果表明,这一催化体系无论是对非共轭的环双烯还是链双烯都具有催化剂活性高,反应条件温和,产物选择性好的特点.本文用同一体系,以4-乙烯基环已烯（1）为代表,研究了更多还原

【Abstract】 The isomerization of 4-vinylcyclohexene catalyzed by Cp₂TiCl₂/i-C₃H₇MgBr wasstudied.The system was found to have excellent catalytic activity and high selectivity.Thus,4-vinylcyclohexene can be isomerized quantitatively into 3-ethylidenecyclohexeneat 50℃ in 2h,and at 15℃ for 2h the main isomerization product was 4-ethylidene-cyclohexene with 88％ selectivity and 97％conversion.All the isomerization productswere isolated and characterized by ¹H NMR,MS and IR.The catalytic mechanism wasdiscussed.更多还原