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:
Apr. 14, 1987
Filed:
Feb. 21, 1985
Applicant:
Inventors:
Otto Arndt, Hofheim am Taunus, DE;
Theodor Papenfuhs, Frankfurt am Main, DE;
Assignee:
Hoechst Aktiengesellschaft, , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548217 ; 260694 ;
Abstract
A process for the preparation of 2,6-dichlorobenzoxazole, which comprises reacting 6-chlorobenzoxazolone in the presence of chlorine, phosphorus trichloride and phosphoryl chloride, or in mixtures of phosphorus pentachloride and phosphoryl chloride, at temperatures of 150.degree. to 170.degree. C., under pressure, the weight ratio of chlorine and phosphorus trichloride to phosphoryl chloride or of phosphorus pentachloride to phosphoryl chloride being 0.15:1 to 0.60:1.