US4275199A
Expired / Lapsed
US
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Process for preparing mixed sulfonates of bis-(N-oxypyridyl-2-thio)aluminum
Assignee: L'Oréal SA
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Filing: 1980-01-08
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Granted: 1981-06-23
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Expires: 2000-01-08
Abstract
Abstract A process is disclosed for the preparation of bis-(N-oxypyridyl-thio) derivatives of aluminum sulfonates by reacting a bis-isopropylate aluminum derivative of an organic sulfonate with two equivalents of the N-oxide of pyridine-2 thiol. The bis-isopropylate aluminum derivative of the organic sulfonate is formed by reacting the organic sulfonic acid precursor with aluminum isopropylate.
Inventors
- 👤 Claude Bouillon
- 👤 Georges Rosenbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:17
CPC Classifications
C; C07; C07F; C07F5/00; C07F5/06; C07F5/069; A; A61; A61P; A61P31/00; A61P31/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
146 words
Process for preparing compounds of the formula: ##STR19## in which R 1 is selected from the group consisting of (i) alkyl of 1 to 4 carbon atoms, (ii) ##STR20## in which R' is methyl, chloro or hydroxy, ##STR21## in which Ar is C 6 H 5 -- or p--CH 3 C 6 H 4 --, ##STR22## in which R" is hydrogen or iodo; (x) --CH 2 --CH 2 --NH 2 , and (xi) --CH 2 --CH(COOH)--NH 2 wherein said process is undertaken in two stages; wherein in a first stage an intermediate compound of the formula ##STR23## is prepared by reacting an equimolar quantity of aluminum isopropylate with a sulfonic acid of the formula R 1 SO 3 H wherein R 1 is as defined above and wherein in a second stage, said intermediate compound is reacted with two equivalents of the N-oxide of pyridine-2 thiol.
Claim 2
Dependent Claim
146 words
Process for preparing compounds of the formula: ##STR19## in which R 1 is selected from the group consisting of (i) alkyl of 1 to 4 carbon atoms, (ii) ##STR20## in which R' is methyl, chloro or hydroxy, ##STR21## in which Ar is C 6 H 5 -- or p--CH 3 C 6 H 4 --, ##STR22## in which R" is hydrogen or iodo; (x) --CH 2 --CH 2 --NH 2 , and (xi) --CH 2 --CH(COOH)--NH 2 wherein said process is undertaken in two stages; wherein in a first stage an intermediate compound of the formula ##STR23## is prepared by reacting an equimolar quantity of aluminum isopropylate with a sulfonic acid of the formula R 1 SO 3 H wherein R 1 is as defined above and wherein in a second stage, said intermediate compound is reacted with two equivalents of the N-oxide of pyridine-2 thiol.
Claim 3
Dependent Claim
25 words
The process according to claim 1, wherein said first and second stages are undertaken in an anhydrous solvent or in a mixture of anhydrous solvents.
Claim 4
Dependent Claim
22 words
The process according to claim 2, wherein said solvent is selected from the group consisting of chloroform, dichloroethane, benzene, toluene and isopropanol.
Claim 5
Dependent Claim
19 words
The process according to claim 1 wherein said stages are undertaken at a temperature of at least 20° C.
Claim 6
Dependent Claim
22 words
The process according to claim 1, wherein said stages are undertaken at the boiling point of the solvent or mixture of solvents.
Claim 7
Dependent Claim
17 words
The process according to claim 2, wherein the product obtained is isolated by concentrating under reduced pressure.
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) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |