US4855085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asymmetric synthesis of natural vitamin E
Assignee: Hoffmann La Roche Inc
•
Filing: 1989-01-30
•
Granted: 1989-08-08
•
Expires: 2009-01-30
Abstract
Abstract An asymmetric synthesis for Vitamin E in an optically active pure form for 4-(2,5-diloweralkanoyloxy)-3,4,6-trimethylphenyl-butan-2-one and intermediates therein.
Inventors
- 👤 Ka-Kong Chan
- 👤 Gabriel G. Saucy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:37
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/58; C07D311/70; C07D311/72; C07C; C07C46/00; C07C46/02; C07C46/06; C07C46/10; C07C50/00; C07C50/26; C07C50/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
18 words
The optical active antipode of the formula: ##STR21## wherein R 11 is mesyl or tosyl, or lower alkanoyl.
Claim 2
Dependent Claim
18 words
The optical active antipode of the formula: ##STR21## wherein R 11 is mesyl or tosyl, or lower alkanoyl.
Claim 3
Dependent Claim
11 words
The optical antipode of claim 1 where R 11 is acetyl.
Claim 4
Dependent Claim
11 words
The optical antipode of claim 2 wherein R 11 is mesyl.
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) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |