Provided is a non-cyclopentadienyl-based chromium-ligand complex, preferably a chromium-ligand complex of formula (J): LCr(RA)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 RA is hydrocarbylene (a hydrocarbylene chromium-ligand complex of formula (J)) or m is 2 and each RA independently is hydrocarbyl (a dihydrocarbyl chromium-ligand complex of formula (J)), wherein each hydrocarbyl or hydrocarbylene of RA independently is unsubstituted or substituted by from 1 to 5 RAS; each RAS 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 RA 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
铬配体复合物,优选为公式(J)的
铬配体复合物:LCr(RA)m(D)k(J),其中L是非Cp单负离子
配体;Cr(
铬)处于+3或+2的形式氧化态;当Cr形式上是Cr+3时,m为1且RA为烃基(公式(J)的烃基
铬配体复合物)或m为2且每个RA独立地为烃基(公式(J)的二烃基
铬配体复合物),其中每个RA的烃基或烃基亚烷基独立地未被取代或被1至5个RAS取代;每个RAS独立地为中性的无
水脂肪族杂基、中性的无
水杂环烷基、中性的无
水杂芳基或中性的无
水芳基;当Cr形式上是Cr+2时,m为1且RA为烃基(公式(J)的烃基
铬配体复合物);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;其中公式(J)的
铬配体复合物总体上是中性的,并且缺少
环戊二烯基(Cp基)基团。还提供了由该复合物组成或制备的
铬催化剂。还提供了制备该催化剂的方法以及使用
铬催化剂聚合烯烃单体的方法,特别是直链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。进一步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。还提供了高通量工作流程。