= 2) have been synthesized and characterized. These conveniently accessible complexes proved to be highly active catalysts for ethylene polymerization without an activator. Under the optimized conditions, an activity of 71.4 kg of PE/((mol of Ni) h atm) was observed using 6c as a catalyst. Particularly, it is of great interest that a bulky substituent proximate to the oxygen atom of the β-ketiminato
一系列基于环状β-酮
亚胺基
配体的新型中性
镍配合物,[(2,6- i Pr 2 C 6 H 3)N(CHC 6 H 8 O] Ni(Ph)(PPh 3)(3b),[ (2,6-我
镨2 ç 6 ħ 3)N═CHC ñ 3 ħ 2 ñ 2 Ó(C 6 H ^ 4)]
镍(PH)(PPH 3)(图6a - ç),和[(2- ,6- i Pr 2 C 6 H 3)N═CHC已合成n +3 H 2 n +2 O(C 6 H 4)] Ni(CH 3)(Py)( 7a - c: a, n = 0; b, n = 1; c, n = 2)和特点。这些方便获得的络合物被证明是在没有活化剂的情况下用于
乙烯聚合的高活性催化剂。在优化的条件下,使用6c观察到71.4 kg PE /(((Ni的摩尔数)h atm)的活性作为催化剂。特别地,引起极大兴趣的是,靠近β-酮
亚胺基配合物的氧原子的大取代基不再是获得高催化效率的