Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Novartis AG
Original Assignee
Ciba Geigy AG
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Publication date
Priority claimed from CH1335660Aexternal-prioritypatent/CH398846A/en
Application filed by Ciba Geigy AGfiledCriticalCiba Geigy AG
Publication of ES272531A1publicationCriticalpatent/ES272531A1/en
Process for the preparation of vat dyes, characterized in that: a) a vat dye having at least 5 and at most 6 condensed rings and at least one carboxylic acid amide group is treated with sulfonating agents until at least one SO3H group is introduced, O well b) a tubular dye having at least 5 and at most 6 condensed rings, at least one carboxylic acid amide group and at least one sulfonic acid halide group is subjected to mild hydrolysis; O well c) acylating agents are acylated in the amino group, a vat dye having at least one acylatable amino group and at least 5 and at most 6 condensed rings and, in the case where the starting dye is not there is no stable SO3H group, the acylating agents are chosen which, in addition to the acylating group, contain a stable sulfonic acid group or a group which under the reaction conditions is transformed into a sulphonic acid group, O well d) a vat dye having at least 5 and 8 at most 6 condensed rings, at least one carboxylic acid amide group and at least one HS group (for example, an HS group) is treated with oxidation agents. -CH2), until the transformation of the HS group into a HO3S group. (Machine-translation by Google Translate, not legally binding)
ES0272531A1960-11-291961-11-28Procedure for the preparation of new tina colorants (Machine-translation by Google Translate, not legally binding)
ExpiredES272531A1
(en)