A process for the oligomerisation of ethylene to predominantly 1-hexene or 1-octene or mixtures of 1-hexene and 1-octene includes contacting ethylene with a catalyst under ethylene oligomerisation conditions. The catalyst comprises a source of chromium, a diphosphine ligating compound, and optionally an activator. The diphosphine ligating compound includes at least one optionally substituted fused cyclic structure including at least two rings, the optionally substituted fused cyclic structure including a 5- to 7-membered aromatic first ring bonded to a phosphorus atom, the aromatic first ring being fused to a 4- to 8-membered heterocyclic second ring, the heterocyclic second ring including a heteroatom which is separated by two ring atoms along the shortest connecting path from the phosphorous atom that is bonded to the first aromatic ring.
                            一种用于以
乙烯为原料进行低聚
乙烯反应制备
1-己烯或1-
辛烯或
1-己烯和1-
辛烯混合物的方法,包括在
乙烯低聚反应条件下将
乙烯与催化剂接触。所述催化剂包括
铬源、
二膦配合物和可选的活化剂。所述
二膦配合物包括至少一个可选取代的融合环结构,包括至少两个环,所述可选取代的融合环结构包括与
磷原子键合的5-至7-成员芳香第一环,所述芳香第一环与4-至8-成员杂环第二环融合,所述杂环第二环包括一个杂原子,该杂原子沿着与第一芳香环键合的
磷原子之间的最短连接路径与之分离。