Patent US3972925A successfully refreshed from Google Patents.
US3972925A
Expired / Lapsed
US
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N-perfluoroacyl-amino acids and derivatives thereof
Assignee: Eli Lilly and Co
•
Filing: 1974-10-29
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Granted: 1976-08-03
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Expires: 1994-10-29
Abstract
Abstract An N-perfluoroacyl-L-α-amino acid is converted to the corresponding acid halide which is useful as a resolving agent for the resolution of racemic amines.
Inventors
- 👤 Rex W. Souter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:03
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/16; C07C; C07C233/00; C07C233/01; C07C233/45
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
31 words
A compound of the formula ##EQU1##wherein: R 1 is methyl, isopropyl, or isobutyl; R 2 is hydrogen; R 3 is trifluoromethyl, pentafluoroethyl, or heptafluoropropyl; and X is chlorine, bromine, or iodine.
Claim 2
Dependent Claim
31 words
A compound of the formula ##EQU1##wherein: R 1 is methyl, isopropyl, or isobutyl; R 2 is hydrogen; R 3 is trifluoromethyl, pentafluoroethyl, or heptafluoropropyl; and X is chlorine, bromine, or iodine.
Claim 3
Dependent Claim
9 words
The compound of claim 1 wherein X is chlorine.
Claim 4
Dependent Claim
10 words
The compound of claim 2 wherein R 1 is methyl.
Claim 5
Dependent Claim
10 words
The compound of claim 2 wherein R 1 is isopropyl.
Claim 6
Dependent Claim
10 words
The compound of claim 2 wherein R 1 is isobutyl.
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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |