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Silicon compounds hydrosilylation

I. Ojima, The Hydrosilylation Reaction, in The Chemistry of Organic Silicon Compounds (S. Pa-tai, Z. Rappoport, Edits.), [The Chemistry of Functional Groups, (S. Patai, Edit.)], part 2, p. 1479 ff, Wiley, New York 1989. [Pg.250]

Alkenes with two reactive carbon-carbon double bonds per molecule like 1,5-hexadiene or diallyl ether are used in the synthesis of silicone compounds which can be later crosslinked by hydrosilylation. A sufficiently high excess of double bonds helps to prevent the dienes from taking part in silane addition across both olefmic ends, but trouble comes from double bond isomerization (Eq. 2). [Pg.254]

It has been shown that hydrosilylation may not perform as ideally as is required when preparing co-olefinic silicone compounds from organic a,co-dienes and hydrosil(ox)anes isomerization is a concern and the chemical equivalence of the double bonds requires a large excess of the diene compound to achieve essentially monohydrosilylation. Further side reactions are discussed by Torres et al [9],... [Pg.255]

Acetylenic acrylates have been used to reduce side reactions in the preparation of acrylic sil(ox)anes by hydrosilylation [13,14], Allylic acrylates are known to result in addition products with both types of double bonds. Elimination of propene under loss of the allylic group is a major concern, because this path yields acryloxy silicone compounds with SiOC linkages of low hydrolytic stability. [Pg.256]

Marciniec, B. Hydrosilylation and Related Reaction of Silicon Compounds. In Applied Homogeneous Catalysis with Organometallic Compounds Cornils, B., Herrmann, W. A., Eds. VCH Weinheim, Germany, 1996 pp 487-506. [Pg.302]

Ojima, I. Li, Z. Zhu, J. Recent Advances in the Hydrosilylation Reactions. In The Chemistry of Organic Silicon Compounds Rappoport, Z.,... [Pg.685]

Among the latter group, iridium complexes (though less common than rhodium) and perhaps also ruthenium play crucial roles in many of the above-mentioned transformations of silicon compounds, leading to the creahon of sihcon-carbon bonds. Examples include the hydrosilylation or dehydrogenahve silylation of alkenes and alkynes, the hydroformylahon of vinylsilanes, and the silyhbrmylation of alkynes as well as activation of the sp C—H of arenes (by disilanes) and alkenes (by vinylsilanes). [Pg.364]

For recent reviews, see (a) Comprehensive Handbook on Hydrosilylation Marciniec, B., Ed. Pergamon Oxford, 1992 (b) Ojima, I. in The Chemistry of Organic Silicon Compounds Patai, S., Rappoport, Z., Eds. Wiley New York, 1989 Chapter 25. [Pg.258]

This chapter will summarize the recent advances in hydrosilylation and related reactions catalyzed by transition metal complexes since this subject was reviewed in The Chemistry of Organic Silicon Compounds in 1989 that covered the advances till the end of 19863. [Pg.1688]

Hydrosilylation of a vinyl- or allyl-functionalised silicon compound with a silane... [Pg.120]

While platinum and rhodium are predominantly used as efficient catalysts in the hydrosilylation and cobalt group complexes are used in the reactions of silicon compounds with carbon monooxide, in the last couple of years the chemistry of ruthenium complexes has progressed significantly and plays a crucial role in catalysis of these types of processes (e.g., dehydrogenative silylation, hydrosilylation and silylformylation of alkynes, carbonylation and carbocyclisation of silicon substrates). [Pg.242]

The addition of a silicon compound such as R3SiH to alkene functionality, as shown by reaction 7.25, is used widely in silicone polymer manufacture and is called the hydrosilylation reaction. Although hydrosilylation was discovered in 1947, the first homogeneous catalyst, H2PtCl6 (1-10%), in 2-propanol was reported in 1957 from the laboratories of Dow Coming. [Pg.159]

In catalytic conversions of (organo)silicon compounds only the hydrosilylation is a well-known process of industrial importance [1-5]. However, since 1985 other reactions of silicon compounds catalyzed by transition metal complexes have been revealed and spectacularly developed. Most of them occur via a mechanism involving metal-silicon and metal-hydrogen bonds, only occasionally accompanied by (or sided) metal-carbon bonds. [Pg.491]

Intermolecular hydrosilylation of diethynylsilanes with dihydro-substituted silicon compounds gives high molecular weight polymers -SiR2CH=CH- (e. g., [30]). The polymeric products obtained in the above-mentioned reactions are suitable substrates for ceramic and optoelectronic materials. [Pg.495]


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