Phosphinoaliphaticsilane catalysts for preparation of .beta.-cyanoalkylsilanes
AssigneeDow Corning Corporation
InventorHoward M. Bank
Life of this patent
Estimating the term…
Abstract
The present invention is a process for the preparation of .beta.-cyanoalkylsilanes by contacting a mixture comprising trichlorosilane and an olefinic nitrile with novel phosphinoaliphaticsilane catalysts. The phosphinoaliphaticsilane catalysts are effective in the process as homogeneous catalysts or as supported heterogeneous catalysts. A preferred catalyst for the present process is a phosphinoaliphaticsilane on a solid support. The supported phosphinoaliphaticsilane catalysts have greater activity then the analogous homogeneous catalyst at lower temperatures.
Claims38
A process for preparation of .beta.-cyanoalkylsilanes described by formula ##STR3## the process comprising:
- contacting a mixture comprising trichlorosilane and an olefinic nitrile described by formula ##STR4## with an effective concentration of a phosphinoaliphaticsilane catalyst described by formula
- R.sub.3 SiR.sup.2 PR.sup.3.sub.2
- at a temperature within a range of about 80.degree. C. to 300.degree. C.;
- where each R is independently selected from a group consisting of halogens, monovalent hydrocarbon radicals, substituted monovalent hydrocarbon radicals, alkoxy radicals, and aryloxy radicals;
- R.sup.2 is an unsubstituted bivalent hydrocarbon radical comprising one to 20 carbon atoms;
- each R.sup.3 is an independently selected monovalent hydrocarbon radical comprising one to 20 carbon atoms;
- and each Y is independently selected from a group consisting of hydrogen and alkyl radicals comprising one to eight carbon atoms.
Dependencies are inferred from the claim text.