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. 02, 1979
Filed:
Nov. 02, 1978
Rudiger Berthold, Bad Soden am Taunus, DE;
Wolfgang Tronich, Hofheim am Taunus, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
The N-acetoacetylamino compounds of 2,5-dimethoxy-4-chloro-aniline, 2,4-dimethyl-aniline and 2-methyl-5-chloroaniline are obtained in a good yield and excellent purity, if the above-mentioned anilines are reacted with diketene in an inert organic solvent or diluent in the presence of from 0.1 to 6%, calculated on the weight of the aniline, of water, while adding catalytic amounts of acid. An industrial aniline quality is preferably dried by heating it with a solvent forming with water an azeotropic mixture, and thereafter the amount of water required is added. The products may be used without purification as coupling components for the preparation of pigments.