A Robust Ni(II) alpha-Diimine Catalyst for High Temperature Ethylene Polymerization

作者：Rhinehart, Jennifer L.; Brown, Lauren A.; Long, Brian K.^*

来源：Journal of the American Chemical Society, 2013, 135(44): 16316-16319.

DOI：10.1021/ja408905t

• TRANSITION-METAL-CATALYSTS
• OLEFIN POLYMERIZATION
• LIVING POLYMERIZATION
• POLAR MONOMERS
• COPOLYMERIZATION
• COMPLEXES
• NICKEL
• ACTIVATION
• PROPYLENE

Sterically demanding Ni-II alpha-diimine precatalysts were synthesized utilizing 2,6-bis(diphenylmethyl)-4-methyl aniline. When activated with methylaluminoxane, the catalyst NiBr2(ArN=C(Me)-C(Me)=NAr) (Ar = 2,6 bis(diphenylmethyl)-4-methylbenzene) was highly active, produced well-defined polyethylene at temperatures up to 100 degrees C (M-w/M-n = 1.09-1.46), and demonstrated remarkable thermal stability at temperatures appropriate for industrially used gas-phase polymerizations (80-100 degrees C).

• 出版日期2013-11-6