US4246206A
Expired / Lapsed
US
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Process for the preparation of N,N-bis-(2-hydroxyalkyl)-aminomethane phosphonic acid dimethyl ester
Assignee: Bayer AG
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Filing: 1978-10-23
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Granted: 1981-01-20
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Expires: 1998-10-23
Abstract
Abstract The invention relates to a process for the preparation of N,N-bis-(2-hydroxyalkyl)-aminomethane phosphonic acid dimethyl esters corresponding to the following general formula: ##STR1## wherein each R, may be the same or different and represents hydrogen or, preferably, a lower, linear or branched alkyl radical or halogen-substituted alkyl radical containing from 1 to 6 carbon atoms.
Inventors
- 👤 Karl-Heinz Mitschke
- 👤 Manfred Kapps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:25
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/02; C07D263/04; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4006; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317; C08K5/5333; C08K5/5353
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
86 words
A process for the preparation of N,N-bis-(2-hydroxyalkyl)-aminomethane phosphonic acid dimethyl esters corresponding to the following general formula: ##STR13## wherein each R may be the same or different and represents hydrogen or a linear or branched alkyl or halogen-substituted alkyl radical containing from 1 to 6 carbon atoms, comprising reacting oxazolidines corresponding to the following general formula: ##STR14## with dimethyl phosphite in the presence of H-acid compounds, said H-acid compounds being used in a quantity of from 2 to 25 mol percent based on the end product.
Claim 2
Dependent Claim
86 words
A process for the preparation of N,N-bis-(2-hydroxyalkyl)-aminomethane phosphonic acid dimethyl esters corresponding to the following general formula: ##STR13## wherein each R may be the same or different and represents hydrogen or a linear or branched alkyl or halogen-substituted alkyl radical containing from 1 to 6 carbon atoms, comprising reacting oxazolidines corresponding to the following general formula: ##STR14## with dimethyl phosphite in the presence of H-acid compounds, said H-acid compounds being used in a quantity of from 2 to 25 mol percent based on the end product.
Claim 3
Dependent Claim
28 words
The process of claim 1, characterized in that the H-acid compound is used in a quantity of from 2 to 15 mol %, based on the end product.
Claim 4
Dependent Claim
24 words
A process as claimed in claim 1, characterized in that the reaction is carried out at a temperature of from 0° to 100° C.
Claim 5
Dependent Claim
26 words
A process as claimed in claim 1 or 2, characterized in that the reaction is carried out at a temperature of from 20° to 60° C.
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) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |