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:
Aug. 27, 1996
Filed:
Dec. 12, 1994
Yani Christidis, Paris, FR;
Michael Meier, Frankfurt, DE;
Hoechst AG., , DE;
Abstract
Process for the of aromatic carboxamides from aromatic carboxylic acids and urea Process for the preparation of aromatic carboxamides of the formula (I) ##STR1## in which R.sub.1, R.sub.2, and R.sub.3 are identical or different and are hydrogen, fluorine, chlorine or bromine atoms, or are alkyl(C.sub.1 -C.sub.4), hydroxyl or nitro groups, or R.sub.1 and R.sub.2 form an aromatic ring of 5 or 6 ring members, which ring may be substituted by fluorine, chlorine or bromine atoms or by alkyl(C.sub.1 -C.sub.4), hydroxyl or nitro groups, which involves reacting aromatic carboxylic acids of the formula (II) ##STR2## in which R.sub.1, R.sub.2 and R.sub.3 are as defined above with urea in an inert organic solvent with the addition of a catalytic amount of phosphorous acid.