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:
Nov. 05, 1996
Filed:
Jul. 12, 1995
Applicant:
Inventors:
Jere K Kaplan, Mobile, AL (US);
Wolfgang J Tritschler, Bad Sackingen, DE;
Gary Clauson, San Diego, CA (US);
Assignee:
Ciba-Geigy Corporation, Tarrytown, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548260 ; 548259 ;
Abstract
2-(2-Hydroxyphenyl)-2H-benzotriazoles can be prepared particularly advantageously by catalytically reducing a suitable o-nitroazobenzene compound to the corresponding N-oxybenzotriazole compound in the presence of hydrazine hydrate, a metal catalyst selected from the group consisting of Raney-Ni and the noble metals, an organic or inorganic base, an organic solvent, and optionally water; followed by isolating said N-oxybenzotriazole compound and converting it to the corresponding 2-(2-hydroxyphenyl)-2H-benzotriazole.