Thermal disproportionation of organooxysilanes
AssigneeDow Corning Corporation
InventorHoward M. Bank
Life of this patent
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Abstract
The present invention is a process for the thermal disproportionation of organooxysilanes containing at least one hydrogen, one organooxy, and one cyclic substitutent all bonded to a single silicon atom, where the cyclic substituent is selected from a group consisting of aryls, substituted aryls, cycloalkyls, and substituted cycloalkyls. The process involves heating the organooxysilanes in a liquid phase to a temperature within a range of about 250.degree. C. to 450.degree. C. The present process is particularly useful for the disproportionation of phenyldialkoxysilanes to diphenydialkoxysilanes and cycloalkyldialkoxysilanes to dicyclodialkoxysilanes.
Claims12
A process for thermal disproportionation of organooxysilanes, the process comprising:
- heating organooxysilanes of formula
- R.sub.a R.sup.1.sub.b H.sub.c Si(OR.sup.2).sub.4-a-b-c,
- in liquid phase, at a temperature within a range of about 250.degree. C. to 450.degree. C. for a reaction time within a range of about 0.1 to 18 hours, to effect disproportionation to product organooxysilanes of formula
- R.sub.d R.sup.1.sub.e H.sub.f Si(OR.sup.2).sub.4-d-e-f ;
- where each R is independently selected from a group consisting of aryls, substituted aryls, cycloalkyls of three to 20 carbon atoms, and substituted cycloalkyls of three to 20 carbon atoms;
- R.sup.1 is selected from a group consisting of alkyls of one to 20 carbon atoms, each R is independently selected from a group consisting of R and R.sup.1, a=1 or 2, b=0 or 1, c=1 or 2, a+b+c=2 or 3, d=2 or 3, e=0 or 1, f=0 or 1, and d+e+f=2 or 3.
A process for thermal disproportionation of phenyldimethoxysilane, the process comprising heating phenyldimethoxysilane in liquid phase at a temperature within a range of about 300.degree. C. to 400.degree. C. for a reaction time within a range of about 0.5 hour to four hours, to effect disproportionation to a mixture comprising diphenyldimethoxysilane and dimethoxysilane.
Dependencies are inferred from the claim text.