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US4537983A
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Method of preparing 2-phenylethylchlorosilanes
Assignee: Dynamit Nobel AG
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Filing: 1984-08-27
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Granted: 1985-08-27
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Expires: 2004-08-27
Abstract
Abstract The present invention relates to a method of preparing 2-phenylethylchlorosilanes. Hydrogen chlorosilanes and styrene are used as starting products, and they are reacted together in the presence of benzothiazole. Benzothiazole is used at least in the same amount as the platinum catalyst. The preferred molar ratio of platinum catalyst to benzothiazole is between 1:2 and 1:50. The reaction can be performed with high yields of the 2-isomer, which is virtually free of the 1-isomer, at temperatures up to about 90° C. At the same time, an excess pressure of up to 6 bar is easily tolerable without marked reduction of the yields of the desired product.
Inventors
- 👤 Claus-Dietrich Seiler
- 👤 Hans-Joachim Vahlensieck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:52
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12; C07F7/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
32 words
method of preparing 2-phenylethyl chlorosilanes by the addition of hydrogen chlorosilane onto styrene in homogeneous systems in the presence of platinum catalysts, comprising conducting the addition reaction in the presence of benzothiazole.
Claim 2
Dependent Claim
32 words
method of preparing 2-phenylethyl chlorosilanes by the addition of hydrogen chlorosilane onto styrene in homogeneous systems in the presence of platinum catalysts, comprising conducting the addition reaction in the presence of benzothiazole.
Claim 3
Dependent Claim
27 words
The method of claim 1, wherein the benzothiazole is used in such amounts that the molar ratio of platinum catalyst to benzothiazole is between 1:2 and 1:50.
Claim 4
Dependent Claim
22 words
The method of claim 1, wherein the reaction is performed at temperatures between 40° and 90°, preferably between 65° and 75° C.
Claim 5
Dependent Claim
19 words
The method of claim 1, wherein the reaction is performed at an excess pressure of 2 to 6 bar.
Claim 6
Dependent Claim
14 words
The method of claim 1, wherein the styrene is injected into the hydrogen chlorosilane.
Claim 7
Dependent Claim
22 words
The method of claim 5, wherein at least 10 moles of styrene per hour are injected for every 100 moles of trichlorosilane.
Claim 8
Dependent Claim
15 words
The method of claim 1, wherein the platinum catalyst is H 2 PtCl 6 .
Claim 9
Dependent Claim
14 words
The method of claim 7, wherein the catalyst is in a homogeneous acetone solution.
Claim 10
Dependent Claim
11 words
The method of claim 1, wherein the hydrogen chlorosilane is trichlorosilane.
Claim 11
Dependent Claim
27 words
The method of claim 1, wherein the hydrogen chlorosilane is hydrogen methyldichlorosilane, hydrogen alkyl dichlorosilanes having 2 to 8 carbon atoms in the alkyl group, or dihydrogendichlorosilane.
References Cited (Backward Citations)
US3925434A
Cited
US4469881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |