Patent US5075477A successfully refreshed from Google Patents.
US5075477A
Expired / Lapsed
US
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Direct synthesis of methylchlorosilaakanes
Assignee: Korea Institute of Science and Technology
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Filing: 1991-05-08
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Granted: 1991-12-24
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Expires: 2011-05-08
Abstract
Abstract A novel and improved method for simultaneously producing 2,4,6-trisilaheptane of the following formula (I) and 1,3-disilabutane of the following formula (II), which are the starting material essential for forming silicon polymers: wherein, R is methyl group or chloro group. <IMAGE> (I) <IMAGE> (II) The method is characterized by reacting silicon and chloromethylsilanes of the following formula (III) at 250 DEG C.-350 DEG C. and in the presence of copper as a catalyst, exclusively or together with cadmium powder as a co-catalyst. <IMAGE> (III)
Inventors
- 👤 Il Nam Jung
- 👤 Gyu-Hwan Lee
- 👤 Seung Ho Yeon
- 👤 Mi-Yeon Suk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:24
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12; C07F7/121; C07F7/123; C07F7/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
In a method for producing 2,4,6-trisilaheptanes of the following general formula (I) and 1,3-disilabutane of the following general formula (II), the improvement comprising reacting silicon and chloromethylsilane of the following formula (III) at 250° C.-350° C. and in the presence of a catalyst, exclusively or together with a co-catalyst: ##STR13## in the general formula (I), R is methyl group or chloro group; in the general formula (II), R is methyl group or chloro group; and in the general formula (III), R is methyl group or chloro group.
Claim 2
Dependent Claim
87 words
In a method for producing 2,4,6-trisilaheptanes of the following general formula (I) and 1,3-disilabutane of the following general formula (II), the improvement comprising reacting silicon and chloromethylsilane of the following formula (III) at 250° C.-350° C. and in the presence of a catalyst, exclusively or together with a co-catalyst: ##STR13## in the general formula (I), R is methyl group or chloro group; in the general formula (II), R is methyl group or chloro group; and in the general formula (III), R is methyl group or chloro group.
Claim 3
Dependent Claim
27 words
The method in accordance with claim 1, wherein about 10%-15% of copper or cuprous chloride based on the amount of all reactants is used as the catalyst.
Claim 4
Dependent Claim
25 words
The method in accordance with claim 1, wherein about 0.1%-5% of cadmium powder based on the amount of all reactants is used as the co-catalyst.
Claim 5
Dependent Claim
25 words
The method in accordance with claim 1, wherein in the reaction, about 5%-10% of micro-spherical acid clay based on the amount of silicon is added.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |