US4882448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Si,Si'diorganyl-N-alkyl-tetrachloro-disilazanes and a process for their preparation
Assignee: Hoechst AG
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Filing: 1988-12-02
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Granted: 1989-11-21
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Expires: 2008-12-02
Abstract
Abstract The invention relates to a process for the preparation of Si,Si'-diorganyl-N-alkyl-tetrachloro-disilazanes of the formula RSiCl 2 --NR'--SiCl 2 R, in which R is C 1 -C 4 -alkyl, vinyl or phenyl and R' is C 1 -C 4 -alkyl, and to these compounds themselves, with the exception of those where R=R'=CH 3 . To prepare the compounds mentioned, organyltrichlorosilanes RSiCl 3 and monoalkylamines R'NH 2 are reacted with one another in an aprotic solvent at -10° C. to +70° C., the molar ratio of RSiCl 3 :R'NH 2 being at least 0.3:1.
Inventors
- 👤 Tilo Vaahs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:39
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12; C07F7/121; C07F7/126
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
A process for the preparation of an Si,Si'-diorganyl-N-alkyl-tetrachloro-disilazane of the formula RSiCl 2 --NR'--SiCl 2 R, in which R is C 1 -C 4 -alkyl, vinyl or phenyl and R' is C 1 -C 4 -alkyl, which comprises reacting an organyltrichlorosilane RSiCl 3 and a monoalkylamine R'NH 2 , in which R and R' have the meaning given, with one another in an aprotic solvent at a temperature of -10° C. to +70° C., the molar ratio of RSiCl 3 :R'NH 2 being at least 0.3:1.
Claim 2
Dependent Claim
86 words
A process for the preparation of an Si,Si'-diorganyl-N-alkyl-tetrachloro-disilazane of the formula RSiCl 2 --NR'--SiCl 2 R, in which R is C 1 -C 4 -alkyl, vinyl or phenyl and R' is C 1 -C 4 -alkyl, which comprises reacting an organyltrichlorosilane RSiCl 3 and a monoalkylamine R'NH 2 , in which R and R' have the meaning given, with one another in an aprotic solvent at a temperature of -10° C. to +70° C., the molar ratio of RSiCl 3 :R'NH 2 being at least 0.3:1.
Claim 3
Dependent Claim
20 words
The process as claimed in claim 1, wherein the molar ratio of RSiCl 3 :R'NH 2 is 0.3:1 to 1:1.
Claim 4
Dependent Claim
20 words
The process as claimed in claim 1, wherein the molar ratio of RSiCl 3 :R'NH 2 is 0.5:1 to 0.7:1.
Claim 5
Dependent Claim
19 words
The process as claimed in claim 1, wherein R is methyl, ethyl, vinyl or phenyl and R' is methyl.
Claim 6
Dependent Claim
15 words
The process as claimed in claim 1, wherein R is ethyl and R' is methyl.
Claim 7
Dependent Claim
16 words
The process as claimed in claim 1, wherein an ether is used as the aprotic solvent.
Claim 8
Dependent Claim
34 words
An Si,Si'-diorganyl-N-alkyl-tetrachlorodisilazane of the formula RSiCl 2 --NR'--SiCl 2 R, in which R is C 1 -C 4 -alkyl, vinyl or phenyl and R' is C 1 -C 4 -alkyl, excluding R=R'=CH 3 .
Claim 9
Dependent Claim
34 words
An Si,Si'-diorganyl-N-alkyl-tetrachlorodisilazane of the formula RSiCl 2 --NR'--SiCl 2 R, in which R is C 1 -C 4 -alkyl, vinyl or phenyl and R' is C 1 -C 4 -alkyl, excluding R=R'=CH 3 .
Claim 10
Dependent Claim
18 words
An Si,Si'-diorganyl-N-alkyl-tetrachloro-disilazane as claimed in claim 7, wherein R is ethyl, vinyl or phenyl and R' is methyl.
Claim 11
Dependent Claim
15 words
An Si,Si'-diorganyl-N-alkyl-tetrachloro-disilazane as claimed in claim 7, wherein R is ethyl and R' is methyl.
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) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |