Silicon compounds alkylsilane

See Xenon difluoride Silicon-nitrogen compounds See related alkylsilanes... 

See Xenon difluoride Silicon—nitrogen compounds See related ALKYLSILANES... 

Many investigations of alkyl and aryl chlorosilanes have been reported (125, 220, 225, 254). The probability of cleavage of the R—Si bond is found to decrease with increase in the size of R (220). Methylsilanes (143) and hydrocarbons with trialkylsilyl groups (145) are discussed and extensive studies of linear and cyclic silicon-methylene compounds are also available (22-24, 105-107, 225). Russian workers have looked at alkylsilanes (68), silacycloalkanes (69), and silylvinylacetylenes (144, 195). Silicon-carbon... 

A mechanism for catalysis by platinum compounds was proposed in 1965 by Chalk58) and has since been supported by increasing knowledge about silyl-metal systems and by the direct detection of Pt-Si211) and Rh-Si61,18s) complexes in the reaction mixtures. The suggested mechanism requires olefin coordination to the Pt(II) species (in the case of H2PtCl6 formed by reduction by the silicon hydride), oxidative addition of the silane, formation of an intermediate in which silicon and alkyl are both bonded to the platinum center, and reductive elimination of alkylsilane, probably assisted by coordination of more olefin ... 

To reduce the inductive effect on the Si—C bond, the perfluorinated group has to be isolated from the silicon atom. Fluorination of an alkylsilane even in the P position yields hydrolytically unstable compounds which undergo thermal rearrangements and liberate Cp2=CR2- Fluorination of an alkyl group in the 7 position, CF3CH2CH2—, does not affect the Si— F bond significantly and the hydrolytic stability is adequate for practical use [132]. The dichlorosilane CF3CH2CH2Si(CH3)Cl2 hydrolyzes to form a polysiloxane. However, the ethylene link increases the bulkiness of the side chains, increases the hydrocarbon/flu-orocarbon ratio, and causes fluorocarbon-hydrocarbon and fluorine-silicone interactions and orientation effects which may reduce the surface activity of the fluorinated compound. 

---