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F Hoffmann La Roche AG
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F Hoffmann La Roche AG
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Publication of ES232204A1publicationCriticalpatent/ES232204A1/en
Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms
(AREA)
Abstract
Process for the preparation of azobenzene derivatives, of general formula ** (See formula) ** wherein R1 and R2 are identical or different, and each of these symbols represents hydrogen or an alkoxy or alkoxyalkoyl radical, and its salts, characterized in that an isoxazole compound of general formula is reacted ** (See formula) ** in which R1 and R2 have the significance defined above, with a dihalogenide of azobenzene-4,4'-disulfonic acid and, where appropriate, the condensation product is converted into a salt. (Machine-translation by Google Translate, not legally binding)
ES0232204A1955-11-301956-11-29Procedure for the preparation of azobenzene derivatives (Machine-translation by Google Translate, not legally binding)
ExpiredES232204A1
(en)
Procedure for the obtaining of new derivatives of heterocyclic hydrazines and their salts (Machine-translation by Google Translate, not legally binding)
A procedure for preparing 4-amino-7-alkylamine-6-pteridin - carboxamides or their salts. (Machine-translation by Google Translate, not legally binding)