Provided is a non-cyclopentadienyl-based chromium-ligand complex, preferably a chromium-ligand complex of formula (J): LCr(R
A
)
m
(D)
k
(J), wherein L is a non-Cp monoanionic ligand; Cr (chromium) is in a formal oxidation state of +3 or +2; when Cr formally is Cr
+3
, either m is 1 and R
A
is hydrocarbylene (a hydrocarbylene chromium-ligand complex of formula (J)) or m is 2 and each R
A
independently is hydrocarbyl (a dihydrocarbyl chromium-ligand complex of formula (J)), wherein each hydrocarbyl or hydrocarbylene of R
A
independently is unsubstituted or substituted by from 1 to 5 R
AS
; each R
AS
independently is a neutral aprotic heteroalkyl, neutral aprotic heterocycloalkyl, neutral aprotic heteroaryl, or neutral aprotic aryl; when Cr formally is Cr
+2
, m is 1 and R
A
is hydrocarbyl (a hydrocarbyl chromium-ligand complex of formula (J)); k is an integer of 0 or 1; D is absent when k is 0 or D is a neutral ligand when k is 1; wherein the chromium-ligand complex of formula (J) is overall neutral and lacks a cyclopentadienyl-based (Cp-based) moiety. Also provided is a chromium catalyst comprising or prepared from the complex. Also provided is a process of making the catalyst and a process employing the chromium catalyst for polymerizing the olefin monomer, especially a straight chain 1-alkene, to prepare the polyolefin, especially a partially chain-straightened poly(1-alkene) or olefin block copolymer. Further provided is the partially chain-straightened poly(1-alkene) or olefin block copolymer prepared thereby. Also provided is a high throughput workflow.
提供的是一种非
环戊二烯基
铬配合物,优选为式(J)的
铬配合物:LCr(RA)m(D)k(J),其中L是非Cp单阴离子
配体;Cr(
铬)处于+3或+2的形式氧化态;当Cr形式上为Cr+3时,m为1且RA为烃基亚烷基(式(J)的烃基亚烷基
铬配合物)或m为2且每个RA独立为烃基(式(J)的二烃基
铬配合物),其中每个RA的烃基或烃基亚烷基均为未取代或被1至5个RAS取代;每个RAS独立为中性无
水脂肪族杂基、中性无
水杂环脂肪族基、中性无
水杂环芳基或中性无
水芳基;当Cr形式上为Cr+2时,m为1且RA为烃基(式(J)的烃基
铬配合物);k为0或1的整数;当k为0时D不存在,当k为1时D为中性
配体;其中式(J)的
铬配合物总体上是中性的并且不含
环戊二烯基(Cp基)结构。还提供了一种包含或由该配合物制备的
铬催化剂。还提供了一种制备催化剂的方法以及使用
铬催化剂聚合烯烃单体的方法,尤其是直链1-烯烃,以制备聚烯烃,特别是部分链条直化的聚(1-烯烃)或烯烃嵌段共聚物。还提供了由此制备的部分链条直化的聚(1-烯烃)或烯烃嵌段共聚物。还提供了一种高通量工作流程。