Wm.P. Weber

A new route to dimethylsilanone [(CH3)2Sio]; deoxygenation of dimethylsulfoxide by dimethylsilylene

Abstract Dimethylsilylene has been shown to insert in SiO SiO single bonds of hexamethyl-cyclotrisiloxane to yield 1,1,2,2,4,4,6,6-octamethyl-3,5,7-trioxo-1,2,4,6-tetrasilacycloheptane. Dimethylsilylene has also been shown to deoxygenate dimethyl sulfoxide to yield dimethyl sulfide and dimethylsilanone which can be trapped.

Oxidation of alkenyldisilanes by m-chloroperbenzoic acid

Abstract Oxidation of vinylpentamethyldisilane by m -chloroperbenzoic acid (MCPBA) yields 1-(α,β-epoxyethyl)-1,1,2,2,2-pentamethyldisilane as major product. Conversely, the oxidation of allylpentamethyldisilane yields approximately equal amounts of allylpentamethyldisiloxane and 3-pentamethyldisilanylpropanal. These results have been accounted for in terms of the relative rates of oxidation of the various carboncarbon double bonds and siliconsilicon single bonds which have been determined.

Addition of H2S to α,ω-dienes to yield medium sized heterocycles 1,1-dimethyl-1-sila-5-thiacyclooctane

Dimethyldiallylsilan (I) reagiert bei der Photolyse mit Schwefelwasserstoff uber die Zwischenstufe (II) zum 1,1-Dimethyl-1-sila-5-thia-cyclooctan (III).

Self-reaction of pentamethyldisilyl radicals: is dimethylsilylene a product?

Abstract The self-reaction of the pentamethyldisilyl radical was investigated, in solution at 298 K. Products due to the disproportionation and combination of these radicals were detected in a ratio ≤ 0.48. However, there was no evidence for silylene formation. These results suggest that silylenes, which are formed during polysilane photolysis, are not produced from the self-reaction of polysilyl radicals but must be photo-extruded from the polysilane itself.