Facile Synthesis of <i>ansa</i>-Zirconocenes Incorporating a Linked Dicarbollyl Ligand via Direct Deboration of Zirconocene Carboranyl Complexes
作者:Mei-Mei Sit、Hoi-Shan Chan、Zuowei Xie
DOI:10.1021/om200245g
日期:2011.7.11
ansa-Zirconocene amides incorporating a Me2C-linked cyclopentadienyl-dicarbollyl or indenyl-dicarbollyl ligand were conveniently prepared from direct deboration of the corresponding carboranyl metal complexes using diamines as deboration agents. This represents a new methodology for the preparation of metal dicarbollides.
Reactions of L2Zr(NMe2)2 with Me3Al and PhCCH: synthesis and structural characterization of new zirconium carborane complexes [L2=Me2Si(C9H6)(C2B10H10) and Me2C(C5H4)(C2B10H10)]
Reaction of [eta(5):sigma-Me2Si(C9H6)(C2B10H10)]Zr(NMe2)(2) with excess Me3Al in toluene gave [eta(5):sigma-Me2Si(C9H6)(C2B10H10)]Zr(mu-Me)(2)AlMe2(NMe2) (2). (2). 2 is inactive toward ethylene, but shows a very high activity in ethylene polymerization upon activation with modified methylalumoxane. Recrystallization of 2 from THF/toluene afforded [eta(5):sigma-Me2Si(C9H6)(C2B10H10)]Zr}(2)(mu-O)mu-N[AlMe2(THF)]} (3). Treatment of [eta(5):sigma-Me2C(C5H4)(C2B10H10)]Zr(NMe2)(2) with two equivalents of PhC=CH produced, after recrystallization from THF/toluene, [eta(5):sigma-Me2C(C5H4)(C2B10H10)]Zr(NMe2)}(2)eta(2)eta(2)-(PhC=C=C=CPh)} (5). They were characterized by various spectroscopic data and elemental analyses. Compounds 3 and 5 were further confirmed by single-crystal X-ray analyses. (C) 2003 Elsevier Science B.V. All rights reserved.