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Bulky iminophosphine‐based nickel and palladium catalysts bearing 2,6‐dibenzhydryl groups for ethylene oligo‐/polymerization
Author(s) -
Wu Qitong,
Wang Wenbing,
Xu Guoyong,
Pang Wenmin,
Li Yougui,
Tan Chen,
Wang Fuzhou
Publication year - 2020
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.5428
Subject(s) - chemistry , catalysis , ethylene , palladium , polymer chemistry , polymerization , nickel , chelation , aryl , medicinal chemistry , crystallinity , organic chemistry , polymer , crystallography , alkyl
A series of 2,6‐dibenzhydryl substituted bulky Ni and Pd complexes containing P,N‐chelating ligands, {[2,6‐(Ph 2 CH) 2 ‐4‐R‐C 6 H 2 ‐N=CH‐C 6 H 4 ‐2‐PPh 2 ]MX 2 ; MX 2 =NiBr 2 ; R = Me ( Ni1 ); R = F ( Ni2 ); MX 2 =PdCl 2 , R = Me ( Pd1 )}, have been prepared and used as catalyst precursors for ethylene oligo‐/polymerization. Compared to the corresponding 2,6‐diisopropyl Ni catalyst, these bulky Ni precatalysts activated by Et 2 AlCl exhibited excellent catalytic performance toward ethylene polymerization with activity of up to 1.90 × 10 5 g PE (mol Ni) −1 h −1 , and result in semicrystalline PEs with high molecular weight. The catalytic performance of these bulky P,N‐type complexes was significantly improved by introducing two ortho‐ dibenzhydryl on the N‐aryl substituents. However, the formation of C 10 –C 24 oligomers were generated using their palladium catalysts through ethylene oligomerization at high temperatures.