US3783148A
Expired / Lapsed
US
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Process for the preparation of symmetrical azo compounds
Assignee: EIDP Inc
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Filing: 1971-08-31
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Granted: 1974-01-01
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Expires: 1991-08-31
Abstract
Abstract An improved process for the preparation of symmetrical azo compounds comprising coupling the corresponding amino compound, such as 1-aminocyclohexanecarbonitrile in the presence of a hypochlorite, such as sodium hypochlorite, in a solvent containing at the beginning of the reaction at least 95 percent by volume and at the end of the reaction at least 70 percent by volume of a C1-C2 alcohol at a temperature between the freezIng point of the reaction mixture and 50* C.
Inventors
- 👤 J Fuchs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:52
CPC Classifications
C; C07; C07C; C07C255/00; C07C255/63; C07C255/65
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
10 words
The process of claim 1 wherein the alcohol is methanol.
Claim 2
Dependent Claim
19 words
The process of claim 1 wherein the starting amino compound is 1-aminocyclohexanecarbonitrile, and the azo compound product is 1,1''-azobis(cyclohexanecarbonitrile).
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the starting amino compound is 2-amino-2,4-dimethylpentanonitrile, and the azo compound product is 2,2''-azobis(2,4-dimethylpentanonitrile).
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the starting amino compound is 2-amino-4-methoxy-2,4-dimethylpentanonitrile, and the azo compound product is 2,2''-azobis(4-methoxy-2,4-dimeThylpentanonitrile).
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the hypochlorite is prepared in situ from chlorine and the appropriate metal hydroxide.
Claim 6
Dependent Claim
43 words
The process of claim 1 wherein both the hypochlorite solution and the amino compound are added simultaneously to the alcohol, the rates of addition being such that the required molar ratio of the hypochlorite to the amino compound is maintained during the addition.
Claim 7
Dependent Claim
45 words
The process of claim 6, wherein the metal hydroxide solution, chlorine, and the amino compound are added simultaneously to the alcohol, the rates of addition being such that the required molar ratio of the nascent hypochlorite to the amino compound is maintained during the addition.
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |