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:
Jul. 16, 1985
Filed:
Jul. 11, 1983
Applicant:
Inventors:
Winfried Orth, Hassloch, DE;
Werner Fickert, Mannheim, DE;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ;
U.S. Cl.
CPC ...
546297 ;
Abstract
A novel simple process for the preparation of 2-halo-3-nitro-6-alkoxy-pyridines having 1 to 6 alkoxy carbon atoms of high purity comprising adding 2-halo-6-alkoxy-pyridine in portions at 0.degree. to 40.degree. C. to a mixture of concentrated sulfuric acid and concentrated nitric acid to obtain impure 2-halo-3-nitro-6-alkoxy-pyridine, treating the latter with a solution of an alkaline reacting compound in a protic solvent and recovering the said pyridine in substantially pure form which are important intermediates for analgesics.