Scandium Carbene Complexes: Synthesis of Mixed Alkyl, Amido, and Phosphido Derivatives
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posted on 2015-01-12, 00:00 authored by Marie Fustier, Xavier-Frédéric Le Goff, Martin Lutz, J. Chris Slootweg, Nicolas MézaillesDifferent
synthetic strategies are proposed to obtain a family of scandium carbene
complexes. Starting either from scandium trichloride, scandium trisbenzyl,
or the known scandium bis(diphenylthiophosphinoyl)methanediide
chloride complex <b>1</b>, the homoleptic bis-carbene complex
[Sc{C(PPh<sub>2</sub>S)<sub>2</sub>}<sub>2</sub>Li(THF)<sub>2</sub>] (<b>3</b>), the alkyl-carbene complex [Sc{C(PPh<sub>2</sub>S)<sub>2</sub>}{CH(PPh<sub>2</sub>S)<sub>2</sub>}(THF)] (<b>5</b>), the amido-carbene complex [Sc{C(PPh<sub>2</sub>S)<sub>2</sub>}{N(SiMe<sub>3</sub>)<sub>2</sub>}(THF)] (<b>7</b>), and the phosphido-carbene complex [Sc{C(PPh<sub>2</sub>S)<sub>2</sub>}{P(SiMe<sub>3</sub>)<sub>2</sub>}(Py)<sub>2</sub>]
(<b>8</b>) were obtained. The influence of the nature of the
anionic ligand in <i>trans</i> position to the carbene ligand
on the geometries at Sc was probed by DFT calculations in the case
of complexes <b>7</b> and <b>8</b>.
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