Downing, S.P., Guadano, S.C., Pugh, D., Danopoulos, A.A., Bellabarba, R.M., Hanton, M., Smith, D. and Tooze, R.P. (2007) Indenyl- and fluorenyl-functionalized N-heterocyclic carbene complexes of titanium, zirconium, vanadium, chromium, and yttrium. Organometallics, 26 (15), 3762-3770. (doi:10.1021/om700269u).
Abstract
Dimethylindenyl-functionalized N-heterocyclic carbene complexes of titanium(IV), titanium(III), zirconium(IV), and vanadium(III) were prepared from potassium indenylcarbenes by salt elimination reactions. X-ray diffraction studies revealed that in the complexes the ligand adopts a bidentate coordination mode. Alkanolysis of a dimethylindene-functionalized imidazolium salt with Y(CH2SiMe3)3(THF)2 gave rise to a dimeric yttrium bromo alkyl in which the ligand adopts a bidentate coodination mode. Aminolysis of the fluorene-functionalized imidazolium salts with {[Cr(N(SiMe3)2)2(THF)2} led to chromium(II) complexes in which the ligand adopts a monodentate binding mode via the N-heterocyclic carbene end with dangling fluorene groups.
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