Catalyst systems suitable for tetramerizing ethylene to form 1-octene may include a catalyst including a chromium compound coordinated with a ligand and a co-catalyst including an organoaluminum compound. The ligand may have a chemical structure: (R
1
)(R
2
)A-X—C(R
3
)(R
4
). A and C may be phosphorus. X may be B(R
5
), Si(R
5
)
2
, N(R
5
), wherein R
5
is an aryl group substituted with a halogen, halogenated alkyl or a silyl group, and wherein B, or N, or Si is bound to A and C. R
1
, R
2
, R
3
, and R
4
may be independently chosen hydrocarbyl groups or heterohydrocarbyl groups.
适用于
乙烯四聚合生成 1-
辛烯的催化剂体系可包括一种催化剂,该催化剂包括一种与
配体配位的
铬化合物和一种助催化剂,该助催化剂包括一种
有机铝化合物。
配体的
化学结构可以是:(R
1
)(R
2
)A-X-C(R
3
)(R
4
).A 和 C 可以是
磷。X 可以是 B(R
5
)、
硅(R
5
)
2
,N(R
5
) ,其中 R
5
是被卤素、卤代烷基或
硅烷基取代的芳基,其中 B 或 N 或 Si 与 A 和 C 结合。
1
, R
2
, R
3
和 R
4
可以是独立的烃基或杂烃基。