US4051153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intermediates in the synthesis of vitamin E
Assignee: Hoffmann La Roche Inc
•
Filing: 1975-12-09
•
Granted: 1977-09-27
•
Expires: 1995-12-09
Abstract
Abstract A synthesis of vitamin E in racemic or optically active forms from methacryolein or beta-hydroxyisobutyric acid including intermediates in this synthesis.
Inventors
- 👤 Noal Cohen
- 👤 Gabriel Saucy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:54
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/58; C07D311/70; C07D311/72; C07C; C07C19/00; C07C19/075
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
31 words
An optically active antipode of the formula: ##STR42## wherein R 1 is benzyl, tetrahydropyranyl or t-butyl or its optically active antipode, said antipode being free of its other optically active antipode.
Claim 2
Dependent Claim
31 words
An optically active antipode of the formula: ##STR42## wherein R 1 is benzyl, tetrahydropyranyl or t-butyl or its optically active antipode, said antipode being free of its other optically active antipode.
Claim 3
Dependent Claim
11 words
The antipode of claim 1 wherein said antipode is (2S,β R)-6-benzyloxy-2,5,7,8β-pentamethylchroman-2-pentanol.
References Cited (Backward Citations)
US3947473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |