A class of sterically-demanding NiII a-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(diphenyl-methyl)-4-methylbenzene) was highly active, produced well-defined polyethylene at temperatures up to 100 �C (Mw/Mn = 1.09�1.46), and demonstrated remarkable thermal stability at temperatures typically encountered for industrially used gas-phase polymerizations (80-100 �C).

Robust Ni(II) a-diimine catalysts for high temperature ethylene polymerization

247th National Meeting (2014)

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