US4191842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protected alcohols
Assignee: Hoffmann La Roche Inc
•
Filing: 1979-01-17
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Granted: 1980-03-04
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Expires: 1999-01-17
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
2026-11-06 14:05
CPC Classifications
C; C07; C07C; C07C19/00; C07C19/075; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/58; C07D311/70; C07D311/72
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
33 words
A compound of the formula: ##STR43## where R is tetrahydropyranyl, 4-methyl-5,6-dihydro-2H-pyranyl, arylmethyl, alpha-lower alkoxy-lower alkyl, tri(loweralkyl)silyl, or t-butyl; A and B are individually hydrogen or taken together form a carbon to carbon bond.
Claim 2
Dependent Claim
33 words
A compound of the formula: ##STR43## where R is tetrahydropyranyl, 4-methyl-5,6-dihydro-2H-pyranyl, arylmethyl, alpha-lower alkoxy-lower alkyl, tri(loweralkyl)silyl, or t-butyl; A and B are individually hydrogen or taken together form a carbon to carbon bond.
Claim 3
Dependent Claim
10 words
The compound of claim 1 wherein said compound is rac.-1-benzyloxy-2,6,10-trimethyl-9-undecen-4-ol.
Claim 4
Dependent Claim
16 words
The compound of claim 1 wherein said compound is a mixture of (2R,4R,6R)- and (2R,4S,6R)-1-tert. butoxy-2,6,10-trimethylundecan-4-ol.
References Cited (Backward Citations)
US2875251A
Cited
US3381039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |