US3960967A
Expired / Lapsed
US
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Process for producing a sulfone derivative of vitamin A alcohol
Assignee: Hoffmann La Roche Inc
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Filing: 1974-07-19
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Granted: 1976-06-01
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Expires: 1994-07-19
Abstract
Abstract A process for the preparation of vitamin A and esters thereof from the condensation of a sulfone of 2-methyl-4-hydroxy-but-2-ene and an activated derivative of 3-methyl-5-(2,6,6-trimethyl-cyclohexen-1-yl)penta-2,4-diene including intermediates therein.
Inventors
- 👤 Gary Lee Olson
- 👤 Gabriel Saucy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:22
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/06; C07C403/08; C07C317/00; C07C317/16; C07C317/18; C07C403/12; C07C403/22; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
76 words
A process for producing a compound of the formula: ##SPC4## wherein R is unsubstituted aryl, or aryl substituted with an electron donating group; comprising condensing a sulfone of the formula: ##EQU9## wherein R is as above; with a derivative of the formula: ##SPC5## in an inert polar organic solvent medium in the presence of a compound of the formula: ##EQU10## wherein M is an alkali metal and R 10 and R 11 are independently lower alkyl.
Claim 2
Dependent Claim
76 words
A process for producing a compound of the formula: ##SPC4## wherein R is unsubstituted aryl, or aryl substituted with an electron donating group; comprising condensing a sulfone of the formula: ##EQU9## wherein R is as above; with a derivative of the formula: ##SPC5## in an inert polar organic solvent medium in the presence of a compound of the formula: ##EQU10## wherein M is an alkali metal and R 10 and R 11 are independently lower alkyl.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein R is phenyl or phenyl substituted with lower alkyl, hydroxy, lower alkoxy, phenoxy or ##EQU11## and R 4 and R 5 are hydrogen or lower alkyl.
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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |