US3952011A
Expired / Lapsed
US
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Process for producing hemi-alkali metal salt of 2-pyrrolidone-5-carboxylic acid
Assignee: Ajinomoto Co Inc
•
Filing: 1974-02-25
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Granted: 1976-04-20
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Expires: 1994-02-25
Abstract
Abstract Hemi-alkali metal salts of 2-pyrrolidone-5-carboxylic acid, believed to have the formula: ##SPC1## Wherein Me is an alkali metal, is formed by reaction of 0.75 to 0.99 moles of an alkali metal hydroxide per mole of 2-pyrrolidone-5-carboxylic acid.
Inventors
- 👤 Miyoji Dazai
- 👤 Katsumi Sugiyama
- 👤 Masaaki Iida
- 👤 Hideo Tazuke
- 👤 Hiroo Kageyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:36
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/273; C07D207/277; C07D207/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
5 words
Hemi-alkali salt of 2-pyrrolidone-5-carboxylic acid.
Claim 2
Dependent Claim
5 words
Hemi-alkali salt of 2-pyrrolidone-5-carboxylic acid.
Claim 3
Dependent Claim
12 words
The salt of claim 1, which is hemi-sodium salt of 2-pyrrolidone-5-carboxylic acid.
Claim 4
Dependent Claim
12 words
The salt of claim 2, which is hemi-sodium salt of DL-2-pyrrolidone-5-carboxylic acid.
Claim 5
Dependent Claim
12 words
The salt of claim 1, which is hemi-potassium salt of 2-pyrrolidone-5-carboxylic acid.
Claim 6
Dependent Claim
12 words
The salt of claim 4, which is hemi-potassium salt of L-2-pyrrolidone-5-carboxylic acid.
Claim 7
Dependent Claim
17 words
The salt of claim 4, which is hemi-potassium salt of DL-2-pyrrollidone-5-carboxylic acid .sup.. 1/2 H 2 O.
Claim 8
Dependent Claim
40 words
A process for producing a crystalline hemi-alkali metal salt of 2-pyrrolidone-5-carboxlyic acid which comprises reacting an alkali metal hydroxide with 2-pyrrolidone-5-carboxylic acid in a mole ratio of 0.75 to 0.99 moles of alkali metal hydroxide per mole of 2-pyrrolidone-5-carboxylic acid.
Claim 9
Dependent Claim
40 words
A process for producing a crystalline hemi-alkali metal salt of 2-pyrrolidone-5-carboxlyic acid which comprises reacting an alkali metal hydroxide with 2-pyrrolidone-5-carboxylic acid in a mole ratio of 0.75 to 0.99 moles of alkali metal hydroxide per mole of 2-pyrrolidone-5-carboxylic acid.
Claim 10
Dependent Claim
15 words
The process of claim 7, wherein said reaction is carried out in an aqueous solution.
Claim 11
Dependent Claim
13 words
The salt of claim 2, which is the hemi-sodium salt of L-2-pyrrolidone-5-carboxylic acid.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-20 | 1979-10-20 | 1980-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-20 | 1983-10-20 | 1984-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-20 | 1987-10-20 | 1988-04-20 | $7700.00 | Window Closed / Lapsed |