Patent US4026907A successfully refreshed from Google Patents.
US4026907A
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Antioxidant chroman compounds
Assignee: Hoffmann La Roche Inc
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Filing: 1975-12-04
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Granted: 1977-05-31
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Expires: 1995-12-04
Abstract
Abstract The (6-hydroxy-chroman-2-yl) acetic or carboxylic acid derivatives useful as antioxidants and a method for preparing these derivatives from hydroquinones and intermediates in this synthesis as well as the use of these derivatives as intermediates in the preparation of optically active alpha-tocopherol.
Inventors
- 👤 John William Scott
- 👤 David Richard Parrish
- 👤 Gabriel Saucy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:22
CPC Classifications
C; C07; C07C; C07C255/00; C11; C11B; C11B5/00; C11B5/0021; C11B5/0035
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
81 words
A compound of the formula: ##STR58## wherein R 1 , R 1 ' and R 1 " are hydrogen or lower alkyl; R 2 is hydrogen, lower alkyl or phenyl; R and R' are hydrogen, benzyl, benzhydryl, trityl, alpha-lower alkoxy lower alkyl, tetrahydropyranyl or an acyl moiety derived from the group consisting of a lower alkanoic acid, an aryl lower alkanoic acid, a lower alkane dicarboxylic acid, phosphoric acid and carbonic acid; and n is an integer from 0 to 1.
Claim 2
Dependent Claim
81 words
A compound of the formula: ##STR58## wherein R 1 , R 1 ' and R 1 " are hydrogen or lower alkyl; R 2 is hydrogen, lower alkyl or phenyl; R and R' are hydrogen, benzyl, benzhydryl, trityl, alpha-lower alkoxy lower alkyl, tetrahydropyranyl or an acyl moiety derived from the group consisting of a lower alkanoic acid, an aryl lower alkanoic acid, a lower alkane dicarboxylic acid, phosphoric acid and carbonic acid; and n is an integer from 0 to 1.
Claim 3
Dependent Claim
10 words
The compound of claim 1 wherein said compound is (±)-6-hydroxy-2-(2-hydroxyethyl)-2,5,7,8-tetramethylchroman.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |