US3759997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dealkylation of n-alkyl aromatic amines
Assignee: Individual
•
Filing: 1969-02-14
•
Granted: 1973-09-18
•
Expires: 1989-02-14
Abstract
Abstract Aromatic amines mono-substituted on the amino nitrogen atom with a non-aromatic hydrocarbon substituent such as N-ethyl aniline are converted to primary aromatic amines by removal of the nonaromatic hydrocarbon substituent at a temperature of 275*-400*C in the presence of an aluminum anilide catalyst.
Inventors
- 👤 J Napolitano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:48
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/68; C07C209/82; C07C209/84; C07C211/00; C07C211/43; C07C211/44; C07C211/45; C07C211/46
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
11 words
The process of claim 1 wherein R1 is the ethyl group.
Claim 2
Dependent Claim
11 words
The process of claim 1 wherein R1 is the isopropyl group.
Claim 3
Dependent Claim
27 words
The process of claim 1 conducted at a pressure of from about 1-100 psig above the normal vapor pressure of said primary aniline at the reaction temperature.
Claim 4
Dependent Claim
11 words
The process of claim 4 wherein R1 is the ethyl group.
Claim 5
Dependent Claim
11 words
The process of claim 4 wherein R1 is the isopropyl group.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |