Isolation of a Stable,
Acyclic, Two-Coordinate Silylene
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Abstract
The synthesis and characterization of a stable, acyclic
two-coordinate
silylene, Si(SAr<sup>Me<sub>6</sub></sup>)<sub>2</sub> [Ar<sup>Me<sub>6</sub></sup> = C<sub>6</sub>H<sub>3</sub>-2,6(C<sub>6</sub>H<sub>2</sub>-2,4,6-Me<sub>3</sub>)<sub>2</sub>], by reduction of Br<sub>2</sub>Si(SAr<sup>Me<sub>6</sub></sup>)<sub>2</sub> with a magnesium(I)
reductant is described. It features a V-shaped silicon coordination
with a S–Si–S angle of 90.52(2)° and an average
Si–S distance of 2.158(3) Å. Although it reacts readily
with an alkyl halide, it does not react with hydrogen under ambient
conditions, probably as a result of the ca. 4.3 eV energy difference
between the frontier silicon lone pair and 3p orbitals
