- Preparation method of 1,5-divinyl-3,3-diphenyl-1,1,5,5-tetramethyltrisiloxane
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The invention relates to a preparation method of 1,5-divinyl-3,3-diphenyl-1,1,5,5-tetramethyltrisiloxane. The preparation method comprises the steps: under the protection of protective gas, mixing anorganic solvent, diphenylsilyl glycol, divinyltetramethyldisiloxane and a catalyst at a ratio, raising the temperature for reflux, performing a reaction, performing reflux and separation on water generated during the reaction by using a water separator, lowering the temperature after completion of the reaction, performing neutralization and washing with water so as to obtain an organic phase, andperforming vacuum distillation so as to obtain the product. The problems of environmental protection and low selectivity which are caused by using chlorosilane as a reaction raw material are solved, and the preparation method has the advantages of simple operation, a high catalytic efficiency, a high yield, good safety and the like.
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Paragraph 0038-0062; 0066-0070
(2019/09/14)
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- A Highly Effective Route to Si?O?Si Moieties through O-Silylation of Silanols and Polyhedral Oligomeric Silsesquioxane Silanols with Disilazanes
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A simple and highly practical catalyst-free O-silylation of silanols with commercially available disilazanes has been developed under mild conditions. In the case of polyhedral oligomeric silsesquioxane (POSS) silanols and some other silanols, it was necessary to use catalytic amounts of inexpensive Bi(OTf)3 as additional catalyst. This efficient chlorine-free protocol involves the synthesis of a wide range of important organosilicon derivatives such as unsymmetrical disiloxanes and functionalized silsesquioxanes.
- Kuciński, Krzysztof,Hreczycho, Grzegorz
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p. 1043 - 1048
(2019/02/05)
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- Method of manufacturing polyimidesiloxane compd. divinylbenzyl
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PROBLEM TO BE SOLVED: To provide a production method by which a divinyl siloxane compound such as a divinyltrisiloxane is obtained in a high yield without using dimethyl vinyl chlorosilane.SOLUTION: A method of producing a divinyl siloxane compound represented by general formula (3) includes reacting of a silane diol compound with a divinyl siloxane compound by using an alkali metal catalyst. In the general formula(3), Ris an aryl group having 6 to 10 carbon atoms, Ris an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a cycloalkyl group or a cycloalkenyl group having 5 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or an aralkyl group having 7 to 10 carbon atoms, and Rand Rare each independently an alkyl group having 1 to 4 carbon atoms.
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Paragraph 0021; 0023-0025
(2018/02/06)
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- PREPARATION METHOD OF VINYL-TERMINATED SILOXANE
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The invention relates to a preparation method of vinyl-terminated siloxane. R2R3Si(OR4)2, R12(CH2═CH)SiOSi(CH═CH2)R12, an organic acid and a catalyst are added into a reaction bottle according to the molar ratio of 1:1-1.5:1-2.5:0.005-0.01, wherein R1 is alkyl, R2 and R3 are alkyl, aryl or substituted alkyl, substituted aryl identically and differently, and R4 is alkyl, heating is performed to 50-80° C. while stirring, the stirring reaction is performed at the temperature for 5-30 min, then a dehydrating agent is added, and the reaction is continuously performed for 2-5 h at the temperature of 50-80° C.; and the temperature is reduced to room temperature after the end of reaction, and then dilution, washing with water to neutral, collection of an organic phase, drying, filtering, concentration, reduced pressure distillation and collection of a fraction at corresponding pressure and temperature are sequentially performed so as to obtain a vinyl-terminated siloxane compound product.
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Paragraph 0019; 0020
(2015/11/03)
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