- The influence of additives to the Speier catalyst on hydrosilylation of functionalized alkenes
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Hydrosilylation of several unsaturated compounds with triethoxysilane in the presence of the Speier catalyst with various additives influencing the reaction rate and selectivity was studied. The mechanism of hydrosilylation is discussed.
- Chernyshev,Belyakova,Knyazeva,Pomerantseva,Efimova
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- Organic silicon coupling agent and preparation method thereof
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The invention provides an organic silicon coupling agent and a preparation method thereof. The method is characterized in that a silane group-containing molecule and an alkylene group-containing molecule undergo a hydrosilylation reaction under the catalysis of a highly selective hydrosilylation catalyst to generate the organic silicon coupling agent. The highly selective hydrosilylation catalystutilizes alkene and platinum atoms to form a weak coordination bonds in order to facilitate the activation of the platinum atoms, an organic cage ligand avoids the agglomeration of the platinum atoms,and a spatial three-dimensional structure formed by the complex catalyst can produce a very large steric hindrance, so the selectivity of the hydrosilylation product is greatly improved. The preparation method of the invention is used to prepare the novel coupling agent by a hydrosilylation reaction which cannot be catalyzed by a Karstedt's catalyst.
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Paragraph 0069-0071
(2019/10/01)
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- Preparation method of 3 - methacryloxypropyl triethoxysilane (by machine translation)
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The preparation method comprises the following steps: in the presence of a catalyst, the mass ratio of triethoxysilane and allyl methacrylate is in the range of from about sup .0.0.1- 1~2 3 - 70~90 °C 2~4 0.1~0.3 1.3 0.5~1 1 1 - 1.7 70~90 °C 5~7 0.1 90~140 °C 3 - 0.1~0. 4g/mlThe method is simple and convenient to prepare, low in catalyst consumption, high in efficiency, high in selectivity, high in product yield and good in quality. (by machine translation)
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Paragraph 0016-0022
(2019/10/01)
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- Effect of catalysts on the reaction of allyl esters with hydrosilanes
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The reaction of hydrosilylation of allyl esters XOCH 2CH=CH 2 (X = MeCO, CF 3CO, C 3F 7CO) and PhOCH 2CH=CH 2 with hydrosilanes HSiY 3 (Y = Cl, OEt) in the presence of the Speier catalyst, the Speier catalyst with additives, and of various nickel complexes was studied. The catalytic hydrosilylation reaction in the presence of the Speier catalyst is accompanied by the reduction. Additives to the Speier catalyst (vinyltriethoxysilane and some ethers) allow to suppress considerably the reduction reaction. In the presence of the studied nickel complexes mainly reduction and isomerization reactions occurred. The best nickel catalysts of hydrosilylation were the mixtures of NiCl 2 or Ni(acac) 2 with phosphine oxides. In contrast to allyl esters, the hydrosilylation of simple olefins proceeds easier, the content of the product of hydrosilylation in the reaction mixture reaches 94.3%. Pleiades Publishing, Ltd., 2010.
- Belyakova,Pomerantseva,Efimova,Chernyshev,Storozhenko
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experimental part
p. 728 - 733
(2011/01/05)
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