US3761520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rearrangement of n-alkyl aromatic amines
Assignee: Ethyl Corp
•
Filing: 1969-02-14
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Granted: 1973-09-25
•
Expires: 1989-02-14
Abstract
Abstract N-alkyl secondary aromatic amines having at least one unsubstituted ortho position are converted to orthoalkyl primary aromatic amines by heating to a temperature of 275*-400* C. in the presence of an aluminum anilide catalyst and an olefin which corresponds in structure to the N-alkyl group, but which contains olefinic unsaturation.
Inventors
- 👤 J Napolitano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:22
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/68
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
12 words
The process of claim 1 in which A is the phenyl group.
Claim 2
Dependent Claim
12 words
The process of claim 1 in which A is the 2-ethylphenyl group.
Claim 3
Dependent Claim
17 words
The process of claim 3 in which R1 is an ethyl radical and said olefin is ethylene.
Claim 4
Dependent Claim
12 words
The process of claim 1 comprising heating an aniline having the formula:
Claim 5
Dependent Claim
21 words
The process of claim 5 wherein R2 is the ethyl group, R3 is the methyl group, and said olefin is ethylene.
Claim 6
Dependent Claim
21 words
The process of claim 5 wherein R2 is the ethyl group, R3 is an isopropyl group, and said olefin is ethylene.
Claim 7
Dependent Claim
21 words
The process of claim 5 wherein R2 is the ethyl group, R3 is a sec-butyl group, and said olefin is ethylene.
Claim 8
Dependent Claim
21 words
The process of claim 5 wherein R2 is the ethyl group, R3 is the tert-butyl group, and said olefin is ethylene.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |