13508-63-9Relevant academic research and scientific papers
Method for obtaining polysulphide monoorganoxysilanes
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Page/Page column 8-9, (2011/05/08)
The invention concerns the preparation of sulphur-containing organosilicic compounds of general formula (I) wherein, for example: R1═C1-C15 alkyl; R2 and R3═C1-C6 alkyl; in a mean number ranging from 1.5±0.1 to 5±0.1. Said preparation is carried out by performing successively the following steps (a), (b) and (c): (a) hydrosilylation of the type: R2R3HSi-Hal+CH2═CH—CH2-Hal}Hal-R2R3Si—(CH2)3Hal; (b) alcoholysis of the type: Hal-R2R3Si—(CH2)3-Hal+R1—OH}R′O—R2R3Si—(CH2)3Hal; (c) sulphidization of the type: R′O—R2R3Si—(CH2)3Hal+M2Sx} compound of formula (I); with Hal=a halogen atom and M=alkali metal.
PREPARATION OF ORGANOMONOALKOXY (OR MONOHYDROXY) SILANES FROM ALKOXYSILANES/ORGANOMETALLIC COMPOUNDS
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Page/Page column 8, (2010/08/07)
Organomonoalkoxy/monohydroxy silanes, particularly halogenated or aklenylated organomonoalkoxy (or monohydroxy) silanes, which are useful intermediates in organic syntheses, are prepared by reacting an alkoxysilane with an organometallic compound suited for substituting at least certain of the alkoxy functions of the alkoxysilane with a monovalent hydrocarbon radical other than alkoxy and co-preparing a metallic alkoxylate by-product capable of denaturing the substituted silanes thus obtained, including contacting the metallic alkoxylate with at least one agent (A) reactive with the alkoxy functions of the alkoxylate to generate one or more species inert relative to the alkoxysilane, such agent (A) being selected from among the electrophile and/or mineral acid groups.
PROCESS FOR THE PREPARATION OF HALOALKYLALKOXYSILANCS AND HALOALKYLHALOSILANES
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Page/Page column 12-13, (2009/10/22)
This invention involves a process for the preparation of haloalkylalkoxysilanes and haloalkylhalosilancs. The process comprises reacting an alkoxyhydridosilane or a halohydridosilanc silane with an alkenylhalide compound in the presence of a catalytic amount of an iridium containing catalyst. When a halohydridosilane is the silane rcactant. the resulting haloalkylhalosilane may be alkoxylatcd by reaction with a C1-C6, alcohol, In another aspect of the invention, the reacting is conducted under a reduced oκygen atmosphere to improve the catalyst activity and the yield of the resulting haloalkylhalosilane or halυalkylalkυx vsi lane.
Method for Producing Organoalkoxydialkylsilane
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Page/Page column 8-9, (2008/06/13)
The invention relates to producing an organo alcoxydialkylsilane by a method which consists in introducing by pouring an alcanol in a dialkylhalogenosilane omega-halogenalkyl+an organic solvent (s) phase mixture and in removing a halogen acid formed by entrainment with the aid of said organic solvent(s) phase and is characterised, in particular (i) by selecting a particular phase of solvent(s), for example based on cyclohexane, (2i) by carrying out an alcanol introduction mode which makes it possible to control the drawing off the halogen acid formed during reaction and by (3i) controlling the halogen acid quantity in a reaction medium. The thus obtained dialkylhalogenosilane omega-halogenalkyl is usable, in particular as an initial product for preparing organosilisic sulphur-containing compounds of general formula (IV) by a sulfidising reaction carried out on a alkali metal polysulfur.
Highly efficient O-silylation of alcohol with vinylsilane using a Rh(l)/HCl catalyst at room temperature
Park, Jung-Woo,Jun, Chul-Ho
, p. 4073 - 4076 (2008/02/11)
Highly efficient O-silylation of alcohol with vinylsilane was developed using a catalyst system consisting of [(COE)2RhCl]2 and HCl. In this reaction, a key intermediate is chlorosilane, generated from vinylsilane and HCl, which can be regenerated in the catalytic cycle. Various alcohols and vinylsilanes were applied to the preparation of silyl ether compounds with this catalyst system.
SURFACE MODIFIED ORGANIC·INORGANIC HYBRID GLASS, PROTECTING GROUP INDUCED ALCOHOL OR ITS DERIVATIVE AND PRODUCING METHOD THEREOF
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Page/Page column 40-41, (2010/11/28)
Disclosed are a protected alcohol or derivative thereof, a surface- modified organic-inorganic hybrid glass, and preparation methods thereof. More specifically, disclosed are a protected alcohol or derivative thereof and a surface-modified organic-inorganic hybrid glass, which are prepared by allowing a silane compound, having vinyl or a vinyl derivative, to react with an alcohol or derivative thereof or with an organic-inorganic hybrid glass, in the presence of an acid catalyst, a transition metal catalyst and an organic solvent, so as to introduce an organic group thereto even at room temperature, as well as preparation methods thereof. The disclosed invention allows a functional group to be effectively introduced into alcohol or a derivative thereof or into an organic-inorganic hybrid glass, not only high temperatures but also room temperature, and thus is highly effective in introducing compounds having a thermally sensitive functional group, for example, natural compounds or proteins. Also, the invention makes it possible to introduce various organic groups and to separate and purify organic macromolecule-bonded organosilane compounds using a silica gel column so as to effectively introduce large organic functional groups to inorganic materials. Accordingly, the invention is highly useful in the chemical industry.
Method for obtaining halogenated monoorganoxysilanes useful in particular as synthesis intermediates
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Page/Page column 9; 10, (2008/06/13)
The invention concerns the preparation of halogenated monoorganoxysilanes, of formula (I), said compounds being useful as synthesis intermediate in organic chemistry. Said method for preparing monoorganoxysilanes consists in: using as starting product halogenoalkylsilanes of the (CH3)2SiCl2 type and in substituting the silicon with a radical bearing a divalent unit bound to an electrophilic reactive group capable of reacting with at least an appropriate nucleophilic agent to form a functionalised monoorganoxysilane of formula (II) with, for example: R=C1-C4 alkyl; R, R=C1-C6 alkyl; B═C1-C10 alkylene; m=1 or 2; Hal=halogen; W=amino, mercapto, (organosilyl)-organopolythio radical.
Method of preparing organo dialkylalkoxysilane
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Page/Page column 8, (2008/06/13)
The invention relates to the preparation of organodialkylalkoxysilane using a continuous method consisting in bringing an alkanol into continuous contact with an omega-haloalkyl dialkylhalosilane in a countercurrent reactor, such as a plate column or a packed column. The reaction is performed in the aforementioned countercurrent reactor in the presence or absence of a non-reactive solvent with scavenging of the hydrochloric acid formed. The omega-haloalkyl dialkylalkoxysilane thus formed is particularly suitable for use as a starting material for the preparation of organosilicon compounds containing sulphur having general formula (I) by means of sulphidisation reaction on an alkaline metal polysulphide.
Siloxane polysulfide usable as cross-linking agent, and process for obtaining such
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Page/Page column 7, (2010/02/11)
Siloxane polysulfide compound of the general formula (I) below: in which: the number x, which may be an integer or a fractional number, is equal to or greater than 2; the radicals Z, which may be identical or different, are divalent bond groups; the radicals R, which may be identical or different, are hydrocarbon groups. The use of such a compound as diene elastomer cross-linking agent, in particular in a rubber composition for a tire.
Polyfunctional organosilane usable as a coupling agent and process for the obtainment thereof
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Page column 11-12, (2008/06/13)
A monohydroxysilane polysulfide of the formula: in which the radicals R, which may be identical or different, are hydrocarbon groups preferably comprising from 1 to 15 carbon atoms; the radicals R′, which may be identical or different, are divalent linking groups preferably comprising from 1 to 18 carbon atoms; x is greater than or equal to 2. This hydroxysilane is in particular a bis-(propyidimethylsilanol) polysulfide. A process for obtaining such a hydroxysilane by alcoholysis and/or hydrolysis of a halogenated organosilane, followed by a sulfuration stage. Use of this hydroxysilane as a coupling agent.
