| 摘要 |
1290549 Cyano-substituted silicon compounds UNION CARBIDE CORP 11 Nov 1969 [12 Nov 1968] 55082/69 Headings C3S and C3T Cyano-substituted silanes and siloxanes are prepared by contacting hydrogen cyanide with an organosilicon compound containing at least one olefinically unsaturated Si-bonded radical in the presence of a zero-valent Ni, Pd or Pt complex at a temperature of 20‹ to 350‹ C. and a pressure of 1 to about 20,000 p.s.i.g. The catalyst complex may be stabilized with carbon monoxide or neutral ligands containing olefinic unsaturation or a trivalent donor atom selected from N, P, As, Bi and Sb. The ligands may be mono- or poly-dentate and many examples of suitable complexes are given. The preferred catalysts are soluble complexes of zero-valent Ni and Pd co-ordinated with neutral organic compounds of P, As or Sb, e.g. tetrakis-(triphenyl phosphite) palladium. Many examples of silane and siloxane starting materials are listed. The examples describe the preparation of (1)α- and #-triethoxysilyl propionitrile; (2) #- methyldiethoxysilyl propionitrile; (3) 1,3-bis- (#-cyanoethyl) tetramethyl disiloxane; (4) a mixture of the disiloxane of (3) with 1-(#- cyanoethyl) - 3 - vinyl tetramethyldisiloxane; and (5) a mixture of 4-triethoxysilyl butyronitrile and 2-methyl-3-triethoxysilyl propionitrile. Uses.-The high viscosity cyanopropylmethyl siloxanes may be used as a highly polar stationary phase in vapour phase chromatography; copolymeric gum stocks containing about 5 mol. per cent cyanoethyl methylsiloxy units give superior rubbers. |
