556053-36-2Relevant academic research and scientific papers
Synthesis of chelating, C2-symmetric bis(silylamido) complexes of zirconium, and their activities as olefin polymerization catalysts
Gountchev, Tomislav I.,Don Tilley
, p. 81 - 88 (2003)
The zirconium bis(silylamido) complexes {[DADMB]ZrCl2}2 (3; DADMB=2,2′-bis(tert-butyldimethylsilylamido)-6,6′- dimethylbiphenyl), and [DMBN]ZrCl2·THF (4; DMBN=2,2′-bis(tert-butyldimethylsilylamido)-1,1′-binaphthyl) were prepared from the corresponding lithiated silylamines. The structure of 3 was determined by X-ray crystallography. The benzyl and methyl derivatives of 4, [DBMN]Zr(CH2Ph)2 (5) and [DMBN]ZrMe2·THF (6), were prepared by treatment of 4 with PhCH2K and MeLi, respectively. Reaction of 5 with B(C6F5)3 produces the crystallographically characterized zwitterionic complex [DMBN]Zr(CH2Ph)[η6-PhCH2B(C 6F5)3] (7), in which the benzyl group of the anion is coordinated in an η6-fashion to zirconium. Compounds 3 and 4 are moderately active as ethylene polymerization catalysts when activated with excess MAO. Activation of 5 with 1 equiv. of [Ph3C][B(C6F5)4] resulted in formation of a catalyst which polymerizes neat 1-hexene to give low molecular weight polyhexene.
