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:
Mar. 21, 1978
Filed:
Apr. 02, 1976
Rene Eric Muntwyler, Hofstetten, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
A process for the manufacture of 2-mercaptopyridine-1-oxides and zinc salts thereof, comprising the steps of oxidizing a 2-acetylaminopyridine with peracetic acid in an inert solvent to give a 2-acetamidopyridine-1-oxide, cleaving the acetyl group with mineral acid to give a 2-aminopyridine-1-oxide, diazotizing the 2-aminopyridine-1-oxide and treating the diazonium salt with hydrochloric acid to give a 2-chloropyridine-1-oxide, treating the latter with a sulfhydryl-donor to give a 2-mercaptopyridine-1-oxide, and optionally treating the latter with a zinc salt to make the 2:1 zinc salt of the 2-mercaptopyridine-1-oxide. The resulting zinc salts are useful in anti-dandruff preparations.