申请人:Bercaw E. John
公开号:US20070185363A1
公开(公告)日:2007-08-09
Transition metal catalysts comprise (a) a source of a Group 3 to 10 transition metal, (b) a ligand having the formula:
R
1
R
2
X—Y—XR
3
R
4
wherein X is phosphorus, arsenic or antimony, Y is a bridging group having the formula:
Z-(A)-D-R
m
wherein Z is the moiety linking the X groups, A is a linear or cyclic hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl or substituted heterohydrocarbyl linking group wherein the number of atoms directly linking Z to D is 1, 2 or 3, D is N, P, As, O, S or Se, R is hydrogen, alkyl, hydrocarbyl, substituted hydrocarbyl, heteroalkyl, heterohydrocarbyl or substituted heterohydrocarbyl, and m is 1 or 2,
R
1
,R
2
,R
3
, and R
4
are the same or different and represent hydrocarbyl or functionalized hydrocarbyl moieties with the proviso that if D is nitrogen, R is not a cyclic ether, and optionally an activator. The transition metal catalysts are suitable for the selective trimerisation or tetramerisation of olefins in particular ethylene.
过渡
金属
催化剂包括(a) 3到10族过渡
金属的来源,(b) 具有以下
化学式的
配体:R1R2X—Y—XR3R4其中X是
磷、
砷或
锑,Y是具有以下
化学式的桥接基团:Z-(A)-D-Rm其中Z是连接X基团的基团,A是线性或
环烃基、取代烃基、杂
环烃基或取代杂
环烃基的连接基团,直接连接Z到D的原子数为1、2或3,D是N、P、As、O、S或Se,R是
氢、烷基、烃基、取代烃基、杂烷基、杂
环烃基或取代杂
环烃基,m为1或2,R1、R2、R3和R4相同或不同,表示烃基或功能化烃基基团,条件是如果D是
氮,则R不是
环醚,并且可选地包括活化剂。这些过渡
金属
催化剂适用于特别是
乙烯的选择性三聚或四聚物化反应。