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US 10,364,265 B1Granted
Anhydrosugar synthesis
AssigneeWilliam Marsh Rice University
InventorsLi Chen, Michael S Wong, Zongchao Zhang
Life of this patent
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Abstract
Improved methods of making anhydrosugars by pyrolysis of a substrate sugar to remove at least one water molecule thereby producing a desired anhydrosugar and side products, the improvement being either 1) protecting one hydroxyl group of the substrate sugar before pyrolysis; or (2) pretreating the substrate sugar with a metal salt and optional acid before pyrolysis, wherein lower amounts of said side products are produced by said improved method.
Claims8
A method of making an anhydrosugar, comprising:
- a) dissolving a carbohydrate substrate in a solvent;
- b) performing a Fischer glycosidation on the C1 carbon of said carbohydrate substrate by reacting said dissolved sugar substrate with an alcohol in the presence of a solid acid catalyst, wherein said Fischer glycosidation adds the alcohol on said C1 carbon as an ether;
- c) removing said solid acid catalyst and said solvent to form a solid sample;
- and,
- d) performing heat treatment on said solid sample to produce a desired anhydrosugar.
2 more elements
Dependencies are inferred from the claim text.