申请人:Shell Oil Company
公开号:US04166076A1
公开(公告)日:1979-08-28
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.gtoreq.0 and R is an optionally substituted hydrocarbyl group. Only very small amounts of the undesired 1,6-dimethyl-1,5-cyclooctadiene are formed.
1,5-二甲基-1,5-环辛二烯和1,4-二甲基-4-乙烯基-1-环己烯是通过将异戊二烯与镍化合物、能够将镍还原为零价镍的还原剂以及三烃基磷酸酯、砷酸酯或锑酸酯混合而得到的催化剂接触制备的,其中三烃基中至少有一个是取代烃基CF.sub.3 --(CF.sub.2).sub.n C(H)(R)--,其中n≥0,R是一个可选择地取代的烃基。只形成了极少量不需要的1,6-二甲基-1,5-环辛二烯。