- An Easily Accessed Nickel Nanoparticle Catalyst for Alkene Hydrosilylation with Tertiary Silanes
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The first efficient and non-precious nanoparticle catalyst for alkene hydrosilylation with commercially relevant tertiary silanes has been developed. The nickel nanoparticle catalyst was prepared in situ from a simple nickel alkoxide precatalyst Ni(OtBu)2?x KCl. The catalyst exhibits high activity for anti-Markovnikov hydrosilylation of unactivated terminal alkenes and isomerizing hydrosilylation of internal alkenes. The catalyst can be applied to synthesize a single terminal alkyl silane from a mixture of internal and terminal alkene isomers, and to remotely functionalize an internal alkene derived from a fatty acid.
- Buslov, Ivan,Song, Fang,Hu, Xile
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supporting information
p. 12295 - 12299
(2016/10/13)
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- METHOD FOR PRODUCING ORGANOXYSILANE
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PROBLEM TO BE SOLVED: To provide a method for easily producing high quality alkoxysilane without sublimating contaminant urea and urea hydroxide in the distillation of an alkoxysilane layer after separating an alcohol solution layer with urea and urea hydroxide dissolved therein when chlorosilane is reacted with alcohol in a presence of urea. SOLUTION: The method for producing organoxysilane represented by formula (3) comprises: reacting chlorosilane represented by formula (1) with alcohol represented by formula (2) in a presence of urea; removing hydrogen chloride generated by the above reaction, urea hydroxide produced by reaction of urea, and urea in a reaction system as an alcohol solution dissolved in alcohol in the reaction system from the system; and thereafter distilling an obtained organoxysilane layer with metal alkoxide added to the layer, where R1 and R2 are monovalent hydrocarbon groups, a is an integer of 1-3, b is an integer of 0-2, a+b is an integer of 1-3, and R3 is a monovalent hydrocarbon group. SELECTED DRAWING: None COPYRIGHT: (C)2016,JPOandINPIT
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Paragraph 0033-0034
(2017/04/11)
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- Silicone sealant cross-linking agent and its preparation method and application
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The invention discloses a silicone sealant cross-linking agent, and a preparation method and an application of the silicone sealant cross-linking agent. The preparation method comprises the steps that long-chain alkyl trichlorosilane serves as a cross-linking agent precursor and reacts with a remover, and then the cross-linking agent is obtained. Long-chain alkyl trichlorosilane is C6-C18 alkyl trichlorosilane, and the cross-linking agent is applied to preparation of a silicone sealant. According to the cross-linking agent, long-chain alkyl is added and exerts a plasticizer effect, and in a silicone sealant preparation process, long-chain alkyl is bonded in a high molecular material by a chemical bond, so that the prepared sealant is free from leaked oil pollution.
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Paragraph 0033-0036
(2017/03/17)
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- Hybrid organic-inorganic gels containing perfluoro-alkyl moieties
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Perfluoroalkyltrialkoxysilanes were prepared by hydrosilylation of the allylic or vinylic derivatives with trialkoxysilane or with trichlorosilane (followed by a quantitative methanolysis). The hydrolysis and polycondensation of these precursors were performed in the presence of tetrabutylammoniumfluoride (TBAF) as the catalyst, leading to a series of new polysilsesquioxanes, which were characterized by solid state 13C and 29Si CPMAS NMR. The porosity and surface area of these materials were determined by N2 absorption experiments. Thermogravimetric analyses (TGA) were also performed. The surface properties of films prepared from these silsesquioxanes were studied by contact angle measurements. The hybrids having fluoroalkyl groups at the surface of the material showed a better thermostability and a higher hydrophobic and oleophobic character than their hydrocarbon analogues.
- Ameduri, Bruno,Boutevin, Bernard,Moreau, Jo?l J.E.,Moutaabbid, Hicham,Chi Man, Michel Wong
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p. 185 - 194
(2007/10/03)
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