- 1,1,1,3,3,5,5-heptamethyltrisiloxane preparation method
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The present invention discloses a 1,1,1,3,3,5,5-heptamethyltrisiloxane preparation method, wherein 1,1,1,3,3,3-hexamethyldisiloxane and 1,1,3,3-tetramethyldisiloxane are subjected to co-hydrolysis for 1-4 h under catalysis of concentrated sulfuric acid to obtain 1,1,1,3,3-pentamethyldisiloxane, the 1,1,1,3,3-pentamethyldisiloxane and dimethyl dimethoxy silicane are subjected to co-hydrolysis for 1-3 h under catalysis of concentrated sulfuric acid, rectification is performed, and the distillate at a temperature of 135 DEG C is collected so as to obtain the 1,1,1,3,3,5,5-heptamethyltrisiloxane product. According to the present invention, the method has characteristics of strong target property, less by-product content in the product, and easy separation.
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Paragraph 0015; 0016
(2016/11/21)
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- Platinum-catalyzed reduction of DMF by 1,1,3,3-tetramethyldisiloxane, HMeSi2OSiMe2H: New intermediates HSiMe 2OSiMe2OCH2NMe2 and HSiMe 2(OSiMe2)3OCH2
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The use of Karstedt's catalyst to study the reduction of Me2NCHO (DMF) by the popular "dual SiH"-containing tetramethyldisiloxane, HMe2SiOSiMe2H (1), has revealed that the first step in the process involves an initial sing
- Martinez, Jorge L.,Sharma, Hemant K.,Arias-Ugarte, Renzo,Pannell, Keith H.
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supporting information
p. 2964 - 2967
(2014/07/08)
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- METAL COMPLEX-CATALYZED REDISTRIBUTION REACTIONS OF ORGANOSILANES. IV. REDISTRIBUTION REACTIONS OF METHYLSILOXANES CATALYZED BY TRANSITION METAL COMPLEXES
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Redistribution reactions of a variety of hydrogen-substituted siloxanes are catalyzed by various transition metal complexes of iridium and rhodium.The products arise from breaking and remaking of Si-C, Si-H, and Si-O bonds.Siloxanes not possessing a Si-H bond are inert under the conditions studied.The most favored reaction pathway appears to scramble preferentially the groups directly attached to the silicon bearing the hydrogen atom.A new cyclo-iridiadisiloxane, (L = Ph3P; R = Me3SiO) is reported.This compound exists in three isomeric forms as a consequence of the spatial arrangements of the R and Me groups on the ring.
- Gustavson, Wayne A.,Epstein, Paul S.,Curtis, M.D.
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