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US3860657A
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Process for the preparation of citronellal
Assignee: Givaudan Roure Corp
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Filing: 1970-03-25
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Granted: 1975-01-14
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Expires: 1990-03-25
Abstract
Abstract There is provided a novel process for selectively reducing citral to citronnellal by hydrogenation using wet palladium as catalyst in the presence of a base. It is a particular advantage of the process that citral from synthetic or natural sources may be employed to yield citronellal substantially free of byproducts.
Inventors
- 👤 Jr William M Easter
- 👤 Julian Dorsky
- 👤 Robert F Tavares
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:41
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/61; C07C45/62
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
32 words
A process according to claim 1 wherein the base is selected from the group consisting of alkali metal hydroxides, alkaline earth metal hydroxides, salts of strong bases with weak acids and amines.
Claim 2
Dependent Claim
35 words
A process according to claim 2 wherein the salts of strong bases with weak acids are alkali and alkaline earth meTal carbonates, bicarbonates, acetates and benzoates, and the amines are primary, secondary and tertiary amines.
Claim 3
Dependent Claim
19 words
A process according to claim 1 wherein the palladium is in the form of palladium deposited on a carrier.
Claim 4
Dependent Claim
13 words
A process according to claim 4 wherein the carrier is carbon or alumina.
Claim 5
Dependent Claim
42 words
A process according to claim 5 wherein the catalyst consists essentially of a. 1-10 percent palladium on carbon or alumina b. water c. a base selected from the group of bases consisting of alkali metal hydroxides, alkali metal carbonates and tertiary amines.
Claim 6
Dependent Claim
69 words
A process according to claim 6 wherein the catalyst used consists essentially of a. between 0.2 and 5.0 part by weight of 5 percent palladium on carbon or alumina per 100 parts weight of citral charged b. at least 0.3 parts by weight of water per 100 parts of citral charged c. between 0.1 and 10 parts by weight of base per 100 parts by weight of citral charged.
Claim 7
Dependent Claim
27 words
A process according to claim 6 wherein the hydrogenation is carried out at between about 25* to about 40*C at from about 40 to about 50 psi.
Claim 8
Dependent Claim
45 words
A process according to claim 8 wherein there are used b. between about 1 to about 2 parts by weight of water c. between about 1 to about 3 parts by weight of sodium or potassium carbonate per 100 parts by weight of citral charged.
Claim 9
Dependent Claim
40 words
A process according to claim 8 wherein there are used b. between about 1 to about 2 parts by weight of water c. between about 3-6 parts by weight of triethyl amine per 100 parts by weight of citral charged.
Claim 10
Dependent Claim
43 words
A process according to claim 8 wherein there are used a. between about 1 to about 2 parts by weight of water b. between 0.05 and 0.5 parts by weight of sodium or potassium hydroxide per 100 parts by weight of citral charged.
References Cited (Backward Citations)
US3393237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |