Patent US4585885A successfully refreshed from Google Patents.
US4585885A
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Cyclohexenone derivatives and process for making same
Assignee: F Hoffmann La Roche AG
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Filing: 1983-08-19
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Granted: 1986-04-29
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Expires: 2003-08-19
Abstract
Abstract A silyl-enol ether of the formula ##STR1## wherein n stands for the number and X stands for a group ##STR2## or n stands for the number 1 and X stands for the 6,11-dimethylhexadeca-2,4,6,8,10,12,14-heptaene-2,15-diyl group, the symbols R 1 have the same or different significances and denote alkyl groups, and the symbol R 2 represents a trialkylsiloxy group --OSi(R 1 ) 3 or an ether group, is oxidized with percarboxylic acid and, if desired, the resulting α-siloxy ketone is hydrolyzed to an α-hydroxy ketone. This process is especially suitable for the manufacture of astaxanthin.
Inventors
- 👤 Kurt Bernhard
- 👤 Robert K. Muller
- 👤 Robert Spruijtenburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:15
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/24; C07C403/06; C07C403/08; C07C403/10; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804; C07F9/00; C07F9/02; C07F9/28; C07F9/54; C07F9/5435; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
Compounds of the general formula ##STR12## wherein n stands for the number 0 and X stands for a group ##STR13## or n stands for the number 1 and X stands for the 6,11-dimethylhexadeca-2,4,6,8,10,12,14-heptaene-2,15-diyl group, the symbols R 1 have the same or different significances and denote alkyl groups, and the symbol R 2 represents a trialkylsiloxy group --OSi(R 1 ) 3 or an ether group.
Claim 2
Dependent Claim
65 words
Compounds of the general formula ##STR12## wherein n stands for the number 0 and X stands for a group ##STR13## or n stands for the number 1 and X stands for the 6,11-dimethylhexadeca-2,4,6,8,10,12,14-heptaene-2,15-diyl group, the symbols R 1 have the same or different significances and denote alkyl groups, and the symbol R 2 represents a trialkylsiloxy group --OSi(R 1 ) 3 or an ether group.
Claim 3
Dependent Claim
65 words
Compounds of the general formula ##STR14## wherein n stands for the number 0 and X stands for a group ##STR15## or n stands for the number 1 and X stands for the 6,11-dimethylhexadeca-2,4,6,8,10,12,14-heptaene-2,15-diyl group, the symbols R 1 have the same or different significances and denote alkyl groups, and the symbol R 2 represents a trialkylsiloxy group --OSi(R 1 ) 3 or an ether group.
Claim 4
Dependent Claim
65 words
Compounds of the general formula ##STR14## wherein n stands for the number 0 and X stands for a group ##STR15## or n stands for the number 1 and X stands for the 6,11-dimethylhexadeca-2,4,6,8,10,12,14-heptaene-2,15-diyl group, the symbols R 1 have the same or different significances and denote alkyl groups, and the symbol R 2 represents a trialkylsiloxy group --OSi(R 1 ) 3 or an ether group.
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) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |