The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 22, 1992
Filed:
May. 18, 1990
Applicant:
Inventors:
Coenraad Decnop, Bussum, NL;
Johannes M van Dort, Lage Vuursche, NL;
Johannes T de Hey, Hilversum, NL;
Assignee:
Unilever Patent Holdings B.V., Rotterdam, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
549477 ;
Abstract
The invention provides a process for the preparation of natural 5-methyl- and 2,5-dimethyl-4-hydroxy-2,3-dihydrofuran-3-one, by heating and reacting a pentose or 6-deoxyhexose in the presence of an amino acid and directly separating, the hydroxyfuranone from the reaction mixture by distillation under reduced pressure. Preferably the distillation is carried out in the presence of a high boiling organic solvent, particularly propylene glycol and glycerol. The amino acid is preferably lysine, proline or hydroxyproline.