ES203643A1 - A procedure for the preparation of asymmetric urea derivatives of monoazocolorants (Machine-translation by Google Translate, not legally binding)
- Google Patents
A procedure for the preparation of asymmetric urea derivatives of monoazocolorants (Machine-translation by Google Translate, not legally binding)
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Novartis AG
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Ciba Geigy AG
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Process for the preparation of asymmetric monoazo dye urea derivatives characterized in that two monoazo dyes corresponding to the formulas are treated with phosgene ** in which r1 denotes a benzoyl radical in which the groups -n = n and nh2 are located in position-p of one with respect to the other and r2 a radical linked with the azo group in position- 4 of a 1-oxybenzole-2-carboxylic acid, to which effect the starting materials are determined in such a way that the asymmetric urea derivative that is formed contains a single sulfonic acid group. (Machine-translation by Google Translate, not legally binding)
ES0203643A1952-05-231952-05-23A procedure for the preparation of asymmetric urea derivatives of monoazocolorants (Machine-translation by Google Translate, not legally binding)
ExpiredES203643A1
(en)