US4060571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of N,N-Bis-(2-hydroxyalkyl)-aminomethane phosphonic acid dialkyl esters
Assignee: Bayer AG
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Filing: 1976-02-06
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Granted: 1977-11-29
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Expires: 1996-02-06
Abstract
Abstract A process for the production of N,N-bis-(2-hydroxyalkyl)-aminomethane phosphonic acid dialkyl esters of the formula ##STR1## in which R is an optionally substituted alkyl radical with 2 to 10 carbon atoms, and R' is hydrogen or a lower alkyl radical with up to 6 carbon atoms, Comprising reacting an oxazolidine of the formula ##STR2## with a dialkyl phosphite in the presence of an acid ion exchanger. Preferably R is ethyl or isopropyl, R' is hydrogen or methyl, the ion exchanger is a sulfonated polystyrene resin and the reaction is effected at about 30° to 120° C, especially 60° to 100° C. The products are thereby obtained rapidly in higher purity than heretofore possible.
Inventors
- 👤 Manfred Kapps
- 👤 Karl-Heinz Mitschke
- 👤 Reinhard Schliebs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:20
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317; C08K5/5333; C08K5/5353; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
65 words
A process for the production of N,N-bis(2-hydroxyalkyl)-aminomethane phosphonic acid dialkyl esters of the formula ##STR14## in which R is an optionally substituted alkyl radical with 2 to 10 carbon atoms, and R' is hydrogen or a lower alkyl radical with up to 6 carbon atoms, comprising reacting an oxazolidine of the formula ##STR15## with a dialkyl phosphite in the presence of an acid ion exchanger.
Claim 2
Dependent Claim
65 words
A process for the production of N,N-bis(2-hydroxyalkyl)-aminomethane phosphonic acid dialkyl esters of the formula ##STR14## in which R is an optionally substituted alkyl radical with 2 to 10 carbon atoms, and R' is hydrogen or a lower alkyl radical with up to 6 carbon atoms, comprising reacting an oxazolidine of the formula ##STR15## with a dialkyl phosphite in the presence of an acid ion exchanger.
Claim 3
Dependent Claim
18 words
A process as claimed in claim 1, wherein the ion exchanger is a resin containing sulfonic acid groups.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1, wherein the reaction is carried out at a temperature of about 30° to 120° C.
Claim 5
Dependent Claim
36 words
A process as claimed in claim 2, wherein R' is hydrogen or methyl, the dialkyl phosphite is diethyl or di-isopropyl phosphite, and the reaction is carried out at a temperature of about 60° to 100° C.
Claim 6
Dependent Claim
22 words
A process as claimed in claim 3, wherein the reaction is carried out at a temperature of at least about 85° C.
References Cited (Backward Citations)
US3297796A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |