Patent US3944620A successfully refreshed from Google Patents.
US3944620A
Expired / Lapsed
US
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Process for the preparation of oxophorones
Assignee: Firmenich SA
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Filing: 1974-11-26
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Granted: 1976-03-16
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Expires: 1994-11-26
Abstract
Abstract Process for the preparation of a diketone derivative, viz 2,2,6-trimethyl-cyclohex-5-en-1,4-dione, an organoleptically interesting ingredient for the perfumery and the flavour industry, as well as a useful intermediate for the pharmaceutical industry.
Inventors
- 👤 Joseph J. Becker
- 👤 Ulrich P. Hochstrasser
- 👤 Werner Skorianetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:02
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/27; C07C45/32; C07C45/33; C07C45/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
66 words
Process for the preparation of 2,2,6-trimethyl-cyclohex-5-en-1,4-dione, which comprises oxidizing 3,5,5-trimethyl-cyclohex-2-en-1-one, in the liquid phase, by means of oxygen, or an oxygen containing gas mixture in the presence of a metal catalyst selected from a salt or an oxide of vanadium, chromium, manganese, iron, cobalt, nickel or rhodium or an organic derivative of vanadium, iron, cobalt or rhodium at a temperature of from about 80° to 180°C.
Claim 2
Dependent Claim
66 words
Process for the preparation of 2,2,6-trimethyl-cyclohex-5-en-1,4-dione, which comprises oxidizing 3,5,5-trimethyl-cyclohex-2-en-1-one, in the liquid phase, by means of oxygen, or an oxygen containing gas mixture in the presence of a metal catalyst selected from a salt or an oxide of vanadium, chromium, manganese, iron, cobalt, nickel or rhodium or an organic derivative of vanadium, iron, cobalt or rhodium at a temperature of from about 80° to 180°C.
Claim 3
Dependent Claim
29 words
Process according to claim 1, wherein the catalyst is selected from the group consisting of vanadium III -acetylacetonate, iron III -acetylacetonate, cobalt III -acetylacetonate, and rhodium I -tris-triphenylphosphine chloride.
Claim 4
Dependent Claim
20 words
Process according to claim 1, wherein the oxidation is carried out at a temperature of from about 100° to 130°C.
Claim 5
Dependent Claim
18 words
Process according to claim 1, wherein the oxidation is performed by means of air or oxygen enriched air.
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) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |