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Facile synthesis of sterically demanding SHOP‐type nickel catalysts for ethylene polymerization
Author(s) -
Peng Dan,
Pang Wenmin,
Xu Guoyong,
Tan Chen,
Wang Fuzhou
Publication year - 2019
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.5054
Subject(s) - chemistry , steric effects , nickel , catalysis , ethylene , polymerization , ligand (biochemistry) , polymer chemistry , electronic effect , olefin fiber , organic chemistry , polymer , biochemistry , receptor
The P,O‐chelated shell higher olefin process (SHOP) type nickel complexes are practical homogeneous catalysts for the industrial preparation of linear low‐carbon α‐ olefins from ethylene. We describes that a facile synthetic route enables the modulation of steric hindrance and electronic nature of SHOP‐type nickel complexes. A series of sterically bulky SHOP‐type nickel complexes with variable electronic nature, {[4‐R‐C 6 H 4 C(O) = C‐PArPh]NiPh (PPh 3 ); Ar = 2‐[2′,6′‐(OMe) 2 C 6 H 3 ]C 6 H 4 ; R = H ( Ni1 ); R = OMe ( Ni2 ); R = CF 3 ( Ni3 )}, were prepared and used as single component catalysts toward ethylene polymerization without using any phosphine scavenger. These nickel catalysts exhibit high thermal stability during ethylene polymerization and result in highly crystalline linear α‐ olefinic solid polymer. The catalytic performance of the SHOP‐type nickel complexes was significantly improved by introducing a bulky ortho‐ biphenyl group on the phosphorous atom or an electron‐withdrawing trifluoromethyl on the backbone of the ligand, indicating steric and electronic effects play critical roles in SHOP‐type nickel complexes catalyzed ethylene polymerization.