US2798073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piperidine derivatives and preparation
Assignee: —
•
Filing: —
•
Granted: 1957-07-02
•
Expires: 1974-07-02
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:48
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/36; C07D211/40; C07D211/44; C07D211/52; C07D211/08; C07D211/18; C07D211/20; C07D211/22; C07D211/26; C07D211/30; C07D211/32; C07D211/34; C07D211/46; C07D211/56; C07D211/58; C07D211/60; C07D211/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A PROCESS WHICH COMPRISES LOWER ALKYL A-ALLYLACRYLATE WITH METHYLAMINE THEREBY PRODUCING LOWER ALKYL A-ALLYL-B-METHYLAMINO-PROPIONATE, CONDENSING THE LATTER WITH LOWER ALKYL ACRYLATE THEREBY PRODUCING DI(LOWER ALKYL) A-ALLYL-B,B''-METHYLIMINO-DIPROPIONATE, SUBJECTING THE LATTER TO RING CLOSURE THEREBY PRODUCING 1-METHYL-3ALLYL-4-PIPERIDONE, REACTING THE LATTER WITH AN ORGANOMETALLO-PHENYL COMPOUND AND HYDROLYZING THEREBY PRODUCING 1-METHYL-3-ALLYL-4- HYDROXY- PIPERDINE, AND REACTING THE LATTER WITH AN ACYLATING AGENT WHEREIN THE ACYL RADICAL IS AN ALKANOYL RADICAL HAVING FROM 2 TO 4 CARBON ATOMS THEREBY PRODUCING 1- METHYL-3- ALLYL -4PHENYL- 4 - ALKANOYLOXY - PIPERIDINE WHEREIN THE ALKANOYL RADICAL HAS FROM 2 TO 4 CARBON ATOMS.
Claim 2
Dependent Claim
94 words
A PROCESS WHICH COMPRISES LOWER ALKYL A-ALLYLACRYLATE WITH METHYLAMINE THEREBY PRODUCING LOWER ALKYL A-ALLYL-B-METHYLAMINO-PROPIONATE, CONDENSING THE LATTER WITH LOWER ALKYL ACRYLATE THEREBY PRODUCING DI(LOWER ALKYL) A-ALLYL-B,B''-METHYLIMINO-DIPROPIONATE, SUBJECTING THE LATTER TO RING CLOSURE THEREBY PRODUCING 1-METHYL-3ALLYL-4-PIPERIDONE, REACTING THE LATTER WITH AN ORGANOMETALLO-PHENYL COMPOUND AND HYDROLYZING THEREBY PRODUCING 1-METHYL-3-ALLYL-4- HYDROXY- PIPERDINE, AND REACTING THE LATTER WITH AN ACYLATING AGENT WHEREIN THE ACYL RADICAL IS AN ALKANOYL RADICAL HAVING FROM 2 TO 4 CARBON ATOMS THEREBY PRODUCING 1- METHYL-3- ALLYL -4PHENYL- 4 - ALKANOYLOXY - PIPERIDINE WHEREIN THE ALKANOYL RADICAL HAS FROM 2 TO 4 CARBON ATOMS.
References Cited (Backward Citations)
US2498432A
Cited
US2499433A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |