US4086249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetramethyl chromanyl pentane amide
Assignee: Hoffmann La Roche Inc
•
Filing: 1976-12-08
•
Granted: 1978-04-25
•
Expires: 1996-12-08
Abstract
Abstract Amides of 5[2,5,7,8-tetramethyl-chromanyl]-pentenanoic acid which are intermediates for Vitamin E.
Inventors
- 👤 Ka-Kong Chan
- 👤 Gabriel Saucy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:31
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/58; C07D311/70; C07D311/72
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
47 words
A compound of the formula: ##STR28## wherein A and B are hydrogen or taken together form a carbon to carbon bond; R 1 and R 2 are lower alkyl; R is selected from the group consisting of benzyl, benzhydryl, trityl, t-butyl, tetrahydropyranyl, trimethylsilyl, dimethyl-tertiary-butylsilyl, alpha-loweralkoxyloweralkyl, and 4methyl-5,6-dihydro-2H-pyranyl.
Claim 2
Dependent Claim
47 words
A compound of the formula: ##STR28## wherein A and B are hydrogen or taken together form a carbon to carbon bond; R 1 and R 2 are lower alkyl; R is selected from the group consisting of benzyl, benzhydryl, trityl, t-butyl, tetrahydropyranyl, trimethylsilyl, dimethyl-tertiary-butylsilyl, alpha-loweralkoxyloweralkyl, and 4methyl-5,6-dihydro-2H-pyranyl.
Claim 3
Dependent Claim
22 words
The compound of claim 1 wherein said compound is: ##STR29## wherein A, B, R, R 1 and R 2 are as above.
Claim 4
Dependent Claim
11 words
The compound of claim 2 wherein said compound is 5[2'(S), 6-benzyloxy-2,5,7,8-tetramethyl-2-chromanyl]-2(S),N,N-trimethyl-3(E)-pentenamide.
Claim 5
Dependent Claim
10 words
The compound of claim 2 wherein said compound is 5[2'(R),6-benzyloxy-2,5,7,8-tetramethyl-2-chromanyl]-2(S),N,N-trimethyl-3(E)-pentanamide.
References Cited (Backward Citations)
US4003919A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |