申请人:Shell Oil Company
公开号:US04189403A1
公开(公告)日:1980-02-19
1,5-Dimethyl-1,5-cyclooctadiene and 1,4-dimethyl-4-vinyl-1-cyclohexene are prepared by contacting isoprene with a catalyst obtained by mixing a nickel compound, a reducing agent capable of reducing the nickel to zerovalent nickel, and a trihydrocarbyl phosphite, arsenite or antimonite wherein at least one of the three hydrocarbyl groups is a substituted hydrocarbyl group CF.sub.3 --(CF.sub.2).sub.n C(H)(R)--, in which n.ltoreq.O and R is an optionally substituted hydrocarbyl group. Only very small amounts of the undesired 1,6-dimethyl-1,5-cyclooctadiene are formed.
通过将异戊二烯与催化剂接触制备1,5-二甲基-1,5-环辛二烯和1,4-二甲基-4-乙烯基-1-环己烯,所述催化剂由镍化合物、能够将镍还原为零价镍的还原剂以及三氢基烷基膦酸酯、砷酸酯或锑酸酯混合制得,其中至少三个烷基中的一个是取代烷基CF.sub.3--(CF.sub.2).sub.nC(H)(R)--,其中n≤0,R是一个可选择取代的烷基。只形成非常少量不需要的1,6-二甲基-1,5-环辛二烯。