US2784192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 4-hydroxypiperidines
Assignee: Rohm and Haas Co
•
Filing: 1954-06-24
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Granted: 1957-03-05
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Expires: 1974-06-24
Abstract
No abstract record available.
Inventors
- 👤 Claude J Schmidle
- 👤 Richard C Mansfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:28
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/36; C07D211/40; C07D211/44; C07D211/52; C23; C23F; C23F11/00; C23F11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A PROCESS FOR PREPARING 1-SUBSTITUTED-4-PHENYL-4PIPERIDINOLS WHICH COMPRISES REACTING BETWEEN 0* AND 75* C. IN ACETIC ACID A 1-SUBSTITUTED-4-PHENYL-1,2,3,6TETRAHYDROPYRIDINE WITH ANHYDROUS HYDROGEN BROMIDE TO FORM THE CORESPONDING BROMOPIPERIDINE AND REACTING BETWEEN 75* AND 125* C. SAID BROMOPIPERDINE WITH WATER, THERE BEING IN THE 1-POSITION AN N-SUBSTITUENT FROM THE CLASS CONSISTING OF ALKYL GROUPS OF NOT OVER 12 CARBONS ATOMS, BENZYL, ALLYL, PHENOXYALKYL, BENZYLOXYALKYL, AND LOWER ALKOXYALKYL GROUPS WHEREIN THE ALKYL PROTION ATTACHED TO THE 1-POSITION CONTAINS TWO TO THREE CARBON ATOMS WITH AT LEAST TWO IN THE CHAIN BETWEEN OXYGEN AND NITROGEN.
Claim 2
Dependent Claim
91 words
A PROCESS FOR PREPARING 1-SUBSTITUTED-4-PHENYL-4PIPERIDINOLS WHICH COMPRISES REACTING BETWEEN 0* AND 75* C. IN ACETIC ACID A 1-SUBSTITUTED-4-PHENYL-1,2,3,6TETRAHYDROPYRIDINE WITH ANHYDROUS HYDROGEN BROMIDE TO FORM THE CORESPONDING BROMOPIPERIDINE AND REACTING BETWEEN 75* AND 125* C. SAID BROMOPIPERDINE WITH WATER, THERE BEING IN THE 1-POSITION AN N-SUBSTITUENT FROM THE CLASS CONSISTING OF ALKYL GROUPS OF NOT OVER 12 CARBONS ATOMS, BENZYL, ALLYL, PHENOXYALKYL, BENZYLOXYALKYL, AND LOWER ALKOXYALKYL GROUPS WHEREIN THE ALKYL PROTION ATTACHED TO THE 1-POSITION CONTAINS TWO TO THREE CARBON ATOMS WITH AT LEAST TWO IN THE CHAIN BETWEEN OXYGEN AND NITROGEN.
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) | 1960-03-04 | 1960-09-03 | 1961-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-04 | 1964-09-03 | 1965-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-04 | 1968-09-03 | 1969-03-05 | $7700.00 | Window Closed / Lapsed |