US3692775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Racemization of d-or l-{60 -amino-caprolactam in the presence of metal ions
Assignee: Honeywell International Inc
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Filing: 1969-03-17
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Granted: 1972-09-19
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Expires: 1989-03-17
Abstract
Abstract This invention relates to a method of racemizing enantiomers of compounds containing the group PARTICULARLY ENANTIOMERS OF Alpha -AMINO-E-caprolactam, by contacting said enantiomers with ions of aluminum, chromium, cobalt, copper, indium, nickel, palladium, or zinc, preferably by dissolving salts of said metals in solutions of said enantiomers.
Inventors
- 👤 Anne-Marie Margaretha Kubanek
- 👤 Young Chul Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:07
CPC Classifications
C; C07; C07D; C07D223/00; C07D223/02; C07D223/06; C07D223/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
19 words
A process in accordance with claim 1, wherein said metal is chromium, nickel, palladium, zinc, or a mixture thereof.
Claim 2
Dependent Claim
29 words
A process in accordance with claim 1, wherein said enantiomer and said metal ions are contacted by dissolving a salt of said metal in a melt of sAid enantiomer.
Claim 3
Dependent Claim
56 words
A process in accordance with claim 1, wherein said enantiomer and metal ions are contacted by dissolving a salt of said metal in an enantiomer-containing solution comprising said enantiomer and a solvent selected from the group consisting of water, alcohols which dissolve greater than 2 volume per cent of water at 20* C., and mixtures thereof.
Claim 4
Dependent Claim
14 words
A process in accordance with claim 4, wherein said alcohol is methanol or ethanol.
Claim 5
Dependent Claim
24 words
A process in accordance with claim 4, wherein the temperature of said solution during contacting ranges from about 80* C. to about 110* C.
Claim 6
Dependent Claim
5 words
Di- Alpha -amino-E-caprolactam Cupric Chloride.
Claim 7
Dependent Claim
4 words
Tri- Alpha -amino-E-caprolactam-Nickel Chloride.
Claim 8
Dependent Claim
4 words
Tri-L- Alpha -amino-E-caprolactam-Nickel Chloride.
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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |