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:
Oct. 27, 1981
Filed:
Nov. 03, 1980
Applicant:
Inventors:
Gernot Reissenweber, Ludwigshafen, DE;
Dietrich Mangold, Neckargemuend, DE;
Assignee:
BASF Aktiengesellschaft, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
544105 ; 42424857 ;
Abstract
A process for the preparation of a 2,3-dioxo-1,4-benzoxazine derivative of the formula I ##STR1## where R.sup.1 and R.sup.2 are identical or different and each is hydrogen, alkyl, halogen, haloalkyl, alkoxy, haloalkoxy or nitro, by oxidizing an isatin of the formula II ##STR2## where R.sup.1 and R.sup.2 have the above meanings, with a peroxydisulfate dissolved or suspended in 30-98% strength sulfuric acid. The 2,3-dioxo-1,4-benzoxazine derivatives obtainable by the novel process have fungicidal or fungistatic properties.