Patent US4518787A successfully refreshed from Google Patents.
US4518787A
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Silylation process
Assignee: Dow Silicones UK Ltd
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Filing: 1984-03-15
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Granted: 1985-05-21
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Expires: 2004-03-15
Abstract
Abstract Process for silylating an organic or an organosilicon compound having at least one hydroxyl group bonded to carbon or to silicon, wherein the compound is contacted with both (i) a bis-triorganosilyl(alkylenediamine) and (ii) a triorganohalosilane. The process can be employed for the silylation of intermediates in the production of pharmaceuticals.
Inventors
- 👤 Richard C. Treadgold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:29
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1896; C07F7/1804
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
121 words
A process for silylating an organic or an organosilicon compound which comprises contacting an organic or an organosilicon compound having in the molecule one or more hydroxyl groups bonded to carbon or to silicon with both (i) a compound having the general formula (R.sub.3 Si)NH(CH.sub.2).sub.x NH(SiR.sub.3) wherein each R represents an alkyl group having from 1 to 4 inclusive carbon atoms, the vinyl group or the phenyl group and x is an integer of from 2 to 6 inclusive and (ii) a compound having the general formula R' 3 SiY, wherein each R' represents an alkyl group having from 1 to 6 inclusive carbon atoms, the vinyl group or the phenyl group and Y represents a chlorine, bromine or iodine atom.
Claim 2
Dependent Claim
121 words
A process for silylating an organic or an organosilicon compound which comprises contacting an organic or an organosilicon compound having in the molecule one or more hydroxyl groups bonded to carbon or to silicon with both (i) a compound having the general formula (R.sub.3 Si)NH(CH.sub.2).sub.x NH(SiR.sub.3) wherein each R represents an alkyl group having from 1 to 4 inclusive carbon atoms, the vinyl group or the phenyl group and x is an integer of from 2 to 6 inclusive and (ii) a compound having the general formula R' 3 SiY, wherein each R' represents an alkyl group having from 1 to 6 inclusive carbon atoms, the vinyl group or the phenyl group and Y represents a chlorine, bromine or iodine atom.
Claim 3
Dependent Claim
12 words
A process as claimed in claim 1 wherein each R is methyl.
Claim 4
Dependent Claim
18 words
A process as claimed in claim 1 wherein each R' is selected from methyl groups and butyl groups.
Claim 5
Dependent Claim
20 words
A process as claimed in claim 1 wherein at least one mole of (ii) is employed per mole of (i).
References Cited (Backward Citations)
US3417120A
Cited
US4360686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |