Facile Access to the Functionalized
N-Donor Stabilized
Silylenes PhC(N<i>t</i>Bu)<sub>2</sub>SiX (X = PPh<sub>2</sub>, NPh<sub>2</sub>, NCy<sub>2</sub>, N<i>i</i>Pr<sub>2</sub>, NMe<sub>2</sub>, N(SiMe<sub>3</sub>)<sub>2</sub>, O<i>t</i>Bu)
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Abstract
Reactions of silylenes with organic substrates generally
lead to
silicon(IV) compounds. Ligand substitution at the silicon(II) atom
of silylene, without changing the formal +2 oxidation state, is very
rare. We report herein a straightforward route to functionalized silylenes
LSiX (L = PhC(N<i>t</i>Bu)<sub>2</sub> and X = PPh<sub>2</sub> (<b>1</b>), NPh<sub>2</sub> (<b>2</b>), NCy<sub>2</sub>(<b>3</b>), N<i>i</i>Pr<sub>2</sub> (<b>4</b>), NMe<sub>2</sub> (<b>5</b>), N(SiMe<sub>3</sub>)<sub>2</sub> (<b>6</b>), O<i>t</i>Bu (<b>7</b>)). Silylenes <b>1</b>–<b>7</b> have been prepared in quantitative
yield by a modified ligand exchange reaction of PhC(N<i>t</i>Bu)<sub>2</sub>SiCl (LSiCl) with the corresponding lithium or potassium
salts. Compounds <b>1</b>–<b>7</b> were characterized
by spectroscopic and spectrometric techniques. Single-crystal X-ray
structures of <b>1</b>, <b>3</b>, and <b>4</b> were
determined