US3919197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of beta-alkoxy-omega-lactams
Assignee: Stamicarbon BV
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Filing: 1973-12-05
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Granted: 1975-11-11
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Expires: 1993-12-05
Abstract
Abstract A beta-alkoxy-omega-lactam is prepared by subjecting to heating in the liquid phase an omega-amino-beta-alkoxy-carboxylic acid ester. The heating may be carried out at a temperature of 150* to 350*C. If the amino compound is prepared by hydrogenation of the corresponding cyano compound, it is not necessary to separate the amino compound from the reaction mixture. The lactams obtained may be applied for preparation of polyamides and copolyamides.
Inventors
- 👤 Johan W Garritsen
- 👤 Josef M Penders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:06
CPC Classifications
C; C07; C07D; C07D227/00; C07D227/02; C07D227/06; C07D227/08; C07D227/087
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
19 words
A PROCESS FOR PREPARING A B-ALKOXY-W-LACTAM, COMPRISING HEATING IN THE LIQUID PHASE AN W-AMINO-B-ALKOXYCARBOXYLIC ACID ESTER OF THE FORMULA
Claim 2
Dependent Claim
19 words
A PROCESS FOR PREPARING A B-ALKOXY-W-LACTAM, COMPRISING HEATING IN THE LIQUID PHASE AN W-AMINO-B-ALKOXYCARBOXYLIC ACID ESTER OF THE FORMULA
Claim 3
Dependent Claim
43 words
A PROCESS ACCRODING TO CLAIM 1, WHEREIN THE ESTER STARTING MATERIAL IN ACCORDANCE TO THE SAID GENERAL FORMULA WHEREIN N IS 3 OR 4, R REPRESENTS A METHYL-GROUP OR AN ETHYL GROUP THE TWO R-GROUPS ARE IDENTICAL AND R1 AND R2 REPRESENT HYDROGEN.
Claim 4
Dependent Claim
20 words
A process according to claim 1, wherein the reaction is carried out at a temperature of from 150* to 350*C.
Claim 5
Dependent Claim
18 words
A process according to claim 1, wherein the reaction is carried out in the presence of a solvent.
Claim 6
Dependent Claim
23 words
A process according to claim 1, wherein the reaction mixture containing the amino-ester starting material is obtained by hydrogenation of the corresponding cyano-ester.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |