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:
Dec. 15, 1981
Filed:
May. 27, 1980
Peter Tonne, Neustadt, DE;
Heinz-Guenter Oeser, Ludwigshafen, DE;
Dietrich Mangold, Neckargemuend, DE;
BASF Aktiengesellschaft, , DE;
Abstract
A mixture of an alkyl 3-chloroanthranilate and an alkyl 6-chloroanthranilate, with a particular molar ratio of the components, is prepared by (a) reacting 3-chlorophthalic anhydride with ammonia, an alkali metal hydroxide and an alkali metal hypochlorite or (b) converting 3-chlorophthalic anhydride to 3-chlorophthalimide followed by reaction of the latter with an alkali metal hydroxide and an alkali metal hypochlorite, and, finally, esterifying the mixture of 5-chloroisatoic anhydride and 8-chloroisatoic anhydride, obtained by method (a) or method (b), with an alkanol. The compounds obtainable by the process of the invention are valuable starting materials for the preparation of dyes, crop protection agents and scents.