- Preparation method for vinyl tris(trimethylsiloxane)silane
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The invention discloses a preparation method for vinyl tris(trimethylsiloxane)silane. The preparation method comprises the following steps: with hydrochloric acid as a catalyst, weighing a certain amount of ethoxytrimethylsilane, slowly dropwise adding the ethoxytrimethylsilane into vinyltriethoxysilane at a certain temperature at the same time, carrying out stirring at a constant temperature, carrying out a reaction so as to obtain a colorless transparent liquid, and carrying out separation and purification so as to obtain the vinyl tris(trimethylsiloxane)silane. The preparation method provided by the invention has simple preparation process, can reach a yield of 76% or more, avoids the use of chlorosilane, and is safe and environmentally-friendly. The vinyl tris(trimethylsiloxane)silaneprepared by using the preparation method provided by the invention can be used as a functional modified silicone oil intermediate or a coupling agent, and can be applied to the fields of coatings, moisture-proofing agents, cables, cosmetics, etc.
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Paragraph 0037-0050
(2019/05/15)
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- METHOD FOR THE PRODUCTION OF POLYMERIZABLE SILICONES
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Polymerizable siloxy-substituted silanes are obtained in high yield and purity by adding a substituted alkoxysilane to a mixture of disiloxane, acetic acid, sulfuric acid, and optionally an acidic catalyst, separating a product phase from an acidic phase, adding hexamethyldisilazane to the product phase and filtering off a resulting salt, followed by distillation.
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Page/Page column 7
(2010/03/02)
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- METHOD FOR THE PRODUCTION OF POLYMERIZABLE SILICONES
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Siloxy-substituted silane-containing polymerizable silicones are prepared in high purity by metering a substituted alkoxysilane into a mixture of disiloxane, acetic acid, and acid catalyst, adding acetyl chloride, separating an acidic phase from a product phase, and adding hexamethyldisilazane to the product phase, which is then distilled.
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Page/Page column 6
(2010/03/04)
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- Preparation of branched siloxane
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By reacting a branched siloxane compound of formula (2) containing compounds of formula (1) as an impurity with a disiloxane compound of formula (3) in the presence of an acid compound, there is prepared a branched siloxane of formula (2) containing a reduced level of compounds of formula (1).R1?nSi(OSiR2?3)3-n(OR3)R1?nSi(OSiR2?3)4-nR2?3SiOSiR2?3 R1 is a monovalent hydrocarbon group, R2 and R3 are H or monovalent hydrocarbon groups, and n is 0 or 1.
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Page/Page column 12-13
(2010/02/10)
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- Silaheterocycles, XXV. - (Me3SiO)2Si=CHCH2tBu: A Siloxy-Functionalized Synthetic Equivalent for Dichloropentylsilene
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(Me3SiO)2Si=CHCH2tBu (4) is obtained by the reaction of (Me3SiO)2Si(Cl)CH=CH2 (2) with LitBu.The reaction proceeds via the α-lithiated species 3, which can be intercepted by trimethylsilyl triflate to give 5.Silaethene 4 dimerizes to the E/Z-isomers of disilacyclobutane 7 and adds to Me3SiOMe to give 6.The reactivity of 4 resembles that of Cl2Si=CHCH2tBu (1): A cycloadduct is obtained from the reaction with anthracene, and with 1,3-cyclohexadiene and 1,3-cycloheptadiene mixtures of monosilacyclobutanes (10 and 12) and bicyclic Diels-Alder adducts (9 an 11) are available.Exclusive cycloaddition reactions take place with styrene (formation of 13), 2,3-dimethyl-1,3-butadiene (->19), and 1,3-butadiene (->21).With quadricyclane only the product (14) originating from a cycloaddition is formed, while with 2,5-norbornadiene the and cycloadducts (14 and 15) are formed.In addition the ene products (16, 18, 20, 22) are isolated in some cases from side reactions. - The tendency of 1 and 4 to preferably participate in cycloaddition reactions is ascribed to the polarity of the Si=C bond and the additional influence of the ? donor ligands at silicon.These factors enable a stepwise reaction in which the primary zwitterionic intermediates B are cyclized to yield the SiC fourmembered ring compounds. - Key Words: Silene, neopentyl-/ Me3SiO substituents/ Cycloaddition reactions/ Silaethene derivatives
- Auner, Norbert,Heikenwaelder, Claus-Ruediger,Ziche, Wolfgang
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p. 2177 - 2186
(2007/10/02)
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- Method for the cleavage of organic siloxanes, and products and applications thereof
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A method for the cleavage of organosiloxanes with chlorosilanes in the presence of ferric chloride and hydrogen chloride as catalysts resulting in chloroalkyl silanes or chloroaryl silanes, and organosiloxanes, which are characterized by one or more --O--Si--R3 groups, (R=alkyl or aryl), which are directly bound to a silicon atom which in turn is bound either to the same grouping or to an alkyl or aryl moiety.
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