Disclosed herein is a catalyst system for selective oligomerization of ethylene, which comprises a P—C—C—P frame-work ligand, which is (R1)(R2)P—(R5)CHCH(R6)—P(R3)(R4), and a chromium-based metal compound. Also disclosed is a method of greatly enhancing the activity and selectivity of oligomerization, such as trimerization or tetramerization, using a ligand having a specific steric arrangement structure.
本文披露了一种用于
乙烯选择性寡聚的催化剂系统,包括一种P—C—C—P框架
配体,其为(R1)(R2)P—(R5)CHCH(R6)—P(R3)(R4),以及一种基于
铬的
金属化合物。还披露了一种通过具有特定立体排列结构的
配体大大增强寡聚反应的活性和选择性的方法,如三聚或四聚化。