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. 26, 1985
Filed:
Nov. 29, 1982
Applicant:
Inventors:
Werner Wykypiel, Rodgau, DE;
Wolfgang Tronich, Eppstein, DE;
Assignee:
Hoechst Aktiengesellschaft, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
560020 ;
Abstract
To prepare a 1-nitrobenzene-2-alkyloxycarbonyl-5-carboxylic acid, a dialkyl benzene-1,4-dicarboxylate is first nitrated in a customary manner and the dialkyl 1-nitrobenzene-2,5-dicarboxylate compound obtained is subjected to a partial acidic ester hydrolysis without isolating the nitro compound prepared as an intermediate. The acidic ester hydrolysis is carried out in the presence of a catalytic amount of an organic solvent which is completely or partially miscible with water and has a boiling point of above 90.degree. C. and/or of an emulsifier; it is preferably carried out at a temperature between 65.degree. and 110.degree. C.