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US4092361A
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Process for the preparation of 3,5,5-trimethyl-cyclohex-2-ene-1,4-dione
Assignee: Rhone Poulenc Industries SA
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Filing: 1976-12-16
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Granted: 1978-05-30
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Expires: 1996-12-16
Abstract
Abstract 3,5,5-Trimethyl-cyclohex-2-ene-1,4-dione is prepared by a liquid phase oxidation of β-isophorone using carbon black as catalyst in the presence of a base.
Inventors
- 👤 Michel Costantini
- 👤 Adrien Dromard
- 👤 Michel Jouffret
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:02
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/27; C07C45/32; C07C45/33; C07C45/34
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
48 words
In a process for the preparation of 3,5,5-trimethyl-cyclohex-2-ene-1,4-dione by oxidation of β-isophorone in the liquid phase by means of molecular oxygen or of a gas which contains molecular oxygen, the improvement consisting of carrying out said oxidation using carbon black as catalyst in the presence of a base.
Claim 2
Dependent Claim
48 words
In a process for the preparation of 3,5,5-trimethyl-cyclohex-2-ene-1,4-dione by oxidation of β-isophorone in the liquid phase by means of molecular oxygen or of a gas which contains molecular oxygen, the improvement consisting of carrying out said oxidation using carbon black as catalyst in the presence of a base.
Claim 3
Dependent Claim
23 words
A process according to claim 1, wherein the carbon black has a specific surface area of between 20 and 2,000 m 2 /g.
Claim 4
Dependent Claim
24 words
A process according to claim 1, wherein the amount of carbon black present is from 0.001 to 20% by weight of the reaction mixture.
Claim 5
Dependent Claim
34 words
A process according to claim 1, wherein the base is selected from the group consisting of an alkali metal hydroxide, carbonate or alcoholate, a quaternary ammonium hydroxide, an amine and a heterocyclic nitrogen-containing base.
Claim 6
Dependent Claim
24 words
A process according to claim 4, wherein said base is an alkylamine in which each alkyl radical contains from 1 to 8 carbon atoms.
Claim 7
Dependent Claim
13 words
A process according to claim 5, wherein said alkylamine is secondary or tertiary.
Claim 8
Dependent Claim
22 words
A process according to claim 6, wherein the alkylamine is selected from the group consisting of trimethylamine, triethylamine, diethylamine, diisopropylamine and diisobutylamine.
Claim 9
Dependent Claim
24 words
A process according to claim 1, wherein the amount of base present, expressed in mols per mol of starting β-isophorone is at least 0.01.
Claim 10
Dependent Claim
24 words
A process according to claim 8, wherein the amount of base present, expressed in mols per mol of starting β-isophorone is at least 0.01.
Claim 11
Dependent Claim
28 words
A process according to claim 1, wherein the oxidation temperature is between 0° and 100° C and the partial pressure of oxygen is between 0.1 and 50 bars.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |