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:
Jul. 19, 1988
Filed:
May. 01, 1986
Ernst Spietschka, Idstein, DE;
Frank Prokschy, Frankfurt am Main, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
Process for the preparation of linear quinacridones of the formula (1) ##STR1## in which R denotes a hydrogen, fluorine, chlorine or bromine atom or a C.sub.1 -C.sub.6 -alkyl, C.sub.1 -C.sub.3 -alkoxy or phenyl group or a fused benzene ring or a phenylamino or phenoxy group which can be substituted on the aromatic nucleus by fluorine, chlorine or bromine atoms or C.sub.1 -C.sub.4 -alkyl groups, and n denotes a number from 0 to 2, it being possible, in the event that n.noteq.0, for the substituents R present on the same benzene ring or on the two benzene rings to be identical or different, by the oxidation of linear 6,13-dihydroquinacridones of the formula (2) ##STR2## in which R and n have the meanings mentioned above, which comprises heating, at temperatures from about 180.degree. C. to about 280.degree. C., 1 mole of the last-mentioned compounds with 1 to 2 moles of iodine in a high-boiling organic solvent which is inert towards the reactants.