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:
Dec. 06, 1977
Filed:
Jun. 18, 1976
Hans Greuter, Eiken, CH;
Daniel Bellus, Riehen, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
Process for the production of 2-amino-3-hydroxypyridines of the formula ##STR1## wherein R.sub.1 and R.sub.2 independently of one another represent hydrogen or an alkyl group having 1 to 4 carbon atoms, wherein a furan-2-carboxylic acid of formula ##STR2## wherein R.sub.1 and R.sub.2 have the meaning given above, or a derivative thereof, for example a quaternary ammonium salt, an ester, an amide, a halogenide, an amidine salt, an iminoether salt or the nitrile, is reacted at a temperature of between 100.degree. and 300.degree. C in a solvent containing amide groups, in the presence of an acid catalyst, with ammonia.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile