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。