title: A robust Ni(II) α-diimine catalyst for high temperature ethylene polymerization.
abstract: Sterically demanding Ni(II) α-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 °C (Mw/Mn = 1.09-1.46), and demonstrated remarkable thermal stability at temperatures appropriate for industrially used gas-phase polymerizations (80-100 °C).
authors.affiliation: Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States.
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Rhinehart
authors.forename: Lauren A
authors.initials: LA
authors.lastname: Brown
authors.forename: Brian K
authors.initials: BK
authors.lastname: Long