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. 16, 1977
Filed:
May. 14, 1976
Ernst Hartwig, Heidelberg, DT;
BASF Aktiengesellschaft, Ludwigshafen (Rhine), DT;
Abstract
A process for the production of 1,4-diaminoanthraquinone-2,3-dinitrile by the reaction of a diaminoanthraquinone of the formula (I): ##STR1## in which R.sup.1 and R.sup.2 independently of one another are hydrogen, chloro or bromo, with an ionic cyanide in a polar aprotic solvent, the reaction in the case when R.sup.1 and R.sup.2 are both hydrogen being carried out in the presence of an ammonium salt and the reaction product formed is dehydrogenated or the reaction is carried out with the ionic cyanide under dehydrogenating conditions. The process yields the dinitrile of formula (I) in which R.sup.1 = R.sup.2 = CN in a good yield and high purity. 1,4-diaminoanthraquinone-2,3-dinitrile is a dye and an important starting material for the manufacture of dyes.