Process for the preparation of halogenosilanes
First Claim
1. A process for the preparation of an organohalogenosilane product expressed by the general formula
where R1 is a hydrogen atom or a substituted or unsubstituted monovalent hydrocarbon group, a is 1, 2 or 3 and X is a halogen atom, by a reaction between an organohalogenosilane reactant expressed by the general formula
space="preserve" listing-type="equation">R.sup.2.sub.b SiX.sub.4-bwhere R2 is a substituted or unsubstituted monovalent hydrocarbon group, X is the same as defined above, and b is 0, 1, or 2, always being smaller than the value of the above-defined a and an organopolysiloxane reactant represented by the average unit formula
space="preserve" listing-type="equation">(R.sup.1.sub.3 SiO.sub.0.5).sub.p (R.sup.1.sub.2 SiO).sub.q (R.sup.1 SiO.sub.1.5).sub.r (SiO.sub.2).sub.swhere each R1, which may be the same or different, is the same as defined above and p, q, r and s each are numbers satisfying the requirements of 0 ≦
p ≦
1, 0 ≦
q ≦
1, 0 ≦
r ≦
1, 0 ≦
s <
1 and (p+q+r+s)=1, to bring about a redistribution reaction wherein the reaction is carried out in the presence of a monohydrochloride of a hexaalkylphosphotriamide represented by the general formula ##STR2## where R3 and R4, which may be the same or different, are alkyl groups having 1 to 6 carbon atoms.
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Abstract
Halogenosilanes are prepared from an organohalogenosilane and an organopolysiloxane as the starting materials by subjecting them to an intermolecular redistribution reaction in the presence of a monohydrochloride of a hexaalkylphosphotriamide. The thus prepared halogenosilanes, which are different from the starting halogenosilane reactant, are very useful in the silicone industry.
2 Citations
16 Claims
- 1. A process for the preparation of an organohalogenosilane product expressed by the general formula
- space="preserve" listing-type="equation">R.sup.1.sub.a SiX.sub.4-a
where R1 is a hydrogen atom or a substituted or unsubstituted monovalent hydrocarbon group, a is 1, 2 or 3 and X is a halogen atom, by a reaction between an organohalogenosilane reactant expressed by the general formula
space="preserve" listing-type="equation">R.sup.2.sub.b SiX.sub.4-bwhere R2 is a substituted or unsubstituted monovalent hydrocarbon group, X is the same as defined above, and b is 0, 1, or 2, always being smaller than the value of the above-defined a and an organopolysiloxane reactant represented by the average unit formula
space="preserve" listing-type="equation">(R.sup.1.sub.3 SiO.sub.0.5).sub.p (R.sup.1.sub.2 SiO).sub.q (R.sup.1 SiO.sub.1.5).sub.r (SiO.sub.2).sub.swhere each R1, which may be the same or different, is the same as defined above and p, q, r and s each are numbers satisfying the requirements of 0 ≦
p ≦
1, 0 ≦
q ≦
1, 0 ≦
r ≦
1, 0 ≦
s <
1 and (p+q+r+s)=1, to bring about a redistribution reaction wherein the reaction is carried out in the presence of a monohydrochloride of a hexaalkylphosphotriamide represented by the general formula ##STR2## where R3 and R4, which may be the same or different, are alkyl groups having 1 to 6 carbon atoms.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
Specification
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- Resources
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Current AssigneeShin-Etsu Chemical Company Limited
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Original AssigneeShin-Etsu Chemical Company Limited
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InventorsArai, Masatoshi, Shinohara, Toshio, Ichinohe, Shoji
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Primary Examiner(s)Shaver, Paul F.
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Application NumberUS05/742,845Time in Patent Office579 DaysField of Search260/448.2 PUS Class Current556/467CPC Class CodesC07F 7/125 by reactions involving both...
