US4152513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of alkyl glycosides of amino sugars
Assignee: University of Delaware
•
Filing: 1977-06-01
•
Granted: 1979-05-01
•
Expires: 1997-06-01
Abstract
Abstract A method for controlling the anomer ratio in alkyl glycosides of amino sugars produced by heating an N-acylamino sugar with an alcohol in the presence of an acidic catalyst comprising the continuous removal of byproduct water from the reaction zone.
Inventors
- 👤 Paul R. Austin
- 👤 George A. Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:36
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/02; C07H15/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
The process for improving the proportions of β-anomers in the complex chiral α- and β-anomers formed in the reaction of an N-acylpyranosamine with an aliphatic alcohol having 1-4 carbon atoms in the presence of an acidic ion exchange resin catalyst which comprises carrying out the reaction at a temperature between 30° C. and 100° C. with continuous removal from the reaction zone by distillation the water formed as a by-product.
Claim 2
Dependent Claim
70 words
The process for improving the proportions of β-anomers in the complex chiral α- and β-anomers formed in the reaction of an N-acylpyranosamine with an aliphatic alcohol having 1-4 carbon atoms in the presence of an acidic ion exchange resin catalyst which comprises carrying out the reaction at a temperature between 30° C. and 100° C. with continuous removal from the reaction zone by distillation the water formed as a by-product.
Claim 3
Dependent Claim
2 words
2-Propyl N-acetyl-D-glucosaminide.
Claim 4
Dependent Claim
2 words
2-Propyl N-acetyl-D-glucosaminide.
References Cited (Backward Citations)
US2049758A
Cited
US2276621A
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US2792388A
Cited
US3296245A
Cited
US3375243A
Cited
US4057684A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |