US4337202A
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Process of making L-gulono gamma lactone
Assignee: Officemax Inc
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Filing: 1981-04-16
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Granted: 1982-06-29
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Expires: 2001-04-16
Abstract
Abstract L-gulono gamma lactone is made in a one-step process by the simultaneous hydrolysis and catalytic reduction with hydrogen in acid medium of polyglucuronic acid or a lower alkyl glucuronoside. A use statement--L gulono gamma lactone can be converted chemically or biologically to L-ascorbic acid (vitamin C).
Inventors
- 👤 William M. Hearon
- 👤 John F. Witte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:50
CPC Classifications
C; C07; C07H; C07H19/00; C07H19/01
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
The one-step process of making L-gulono gamma lactone which comprises reacting a uronic acid glycoside of the class consisting of polyglucuronic acid and a lower alkyl glucuronoside having from 1-5 carbon atoms in the alkyl group with hydrogen in an aqueous medium at a pH below about 4 at a reaction temperature of from about 120° to about 140° C. at a pressure of from about 600 to about 1500 p.s.i. in the presence of a periodic table Group VIII noble metal catalyst comprises at least one member of the group consisting of platinum, palladium, ruthenium, rhodium and osmium for a time sufficent to hydrolyze the glycoside to the corresponding free aldehyde, and to reduce the resulting free aldehyde to L-gulono gamma lactone.
Claim 2
Dependent Claim
123 words
The one-step process of making L-gulono gamma lactone which comprises reacting a uronic acid glycoside of the class consisting of polyglucuronic acid and a lower alkyl glucuronoside having from 1-5 carbon atoms in the alkyl group with hydrogen in an aqueous medium at a pH below about 4 at a reaction temperature of from about 120° to about 140° C. at a pressure of from about 600 to about 1500 p.s.i. in the presence of a periodic table Group VIII noble metal catalyst comprises at least one member of the group consisting of platinum, palladium, ruthenium, rhodium and osmium for a time sufficent to hydrolyze the glycoside to the corresponding free aldehyde, and to reduce the resulting free aldehyde to L-gulono gamma lactone.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the uronic acid glycoside comprises polyglucuronic acid.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the uronic acid glycoside comprises a lower alkyl glucuronoside.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein the uronic acid glycoside comprises alpha-methyl glucoside.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein the reaction temperature is from about 120° to 135° C.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein the pH of the aqueous medium is below about 1.6.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein the catalyst comprises small particles of ruthenium.
Claim 9
Dependent Claim
13 words
The process of claim 1 wherein the catalyst comprises small particles of platinum.
Claim 10
Dependent Claim
13 words
The process of claim 1 wherein the catalyst comprises small particles of palladium.
Claim 11
Dependent Claim
13 words
The process of claim 1 wherein the catalyst comprises small particles of rhodium.
References Cited (Backward Citations)
DE618907C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-28 | 1985-12-28 | 1986-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-28 | 1989-12-28 | 1990-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-28 | 1993-12-28 | 1994-06-29 | $7700.00 | Window Closed / Lapsed |