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Novartis AG
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JR Geigy AG
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Publication of ES321019A1publicationCriticalpatent/ES321019A1/en
Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems
(AREA)
Abstract
Process for the preparation of acid anthraquinone dyes, characterized in that an anthraquinone compound of the formula I ** (See formula) ** in which R 1 and R 2 each represent a lower alkyl group and X means an exchangeable substituent for an aralkylamine group, is reacted with an aralkylamine of the formula II, ** (See formula) ** in which R3 means a lower alkyl group and R4 means an aralkyl group which shows at least one hydrogen atom of replaceable nuclear position and optionally substituted in the ring by alkyl or lower alkoxy or halogen groups, to arrive at the corresponding 1-alkylamino-4-aralkylamino-anthraquinonic compound and sulphonate this to arrive at an anthraquinone dye of formula III ** (See formula) ** in which R1, R2 and R3 have the previously indicated significance and R 4 is an arylalkyl radical corresponding to the radical R 4, which is linked to the sulfonic acid group by a ring carbon atom and is optionally substituted on the nucleus by alkyl or lower alkoxy or halogen groups. (Machine-translation by Google Translate, not legally binding)
ES0321019A1965-12-221965-12-27Procedure for the preparation of anthraquinone acid dyes. (Machine-translation by Google Translate, not legally binding)
ExpiredES321019A1
(en)