The Manufacture of Organic Dyestuffs

Cover The Manufacture of Organic Dyestuffs
The Manufacture of Organic Dyestuffs
Andr Wahl
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Amidoanthraquinone and its Derivatives.
The most important of these dyestuffs are those which contain one or two NHR groups, where R represents a sulphonated aromatic nucleus. They are obtained by heating disubstituted derivatives of anthraquinone with aromatic amines ; these derivatives may be dibrom-, dichlor-, dinitro- or dihydroxy-anthraquinones, or anthraquinone disulphonic acids, or their reduction products, or mixed derivatives such as the bromonitro-, hydro xynitro-, etc. , compounds. T
...hus on boiling Quinizarin or leuco-Quinizarin with ^-toluidine, with or without the addition of boric acid, the following reaction occurs : CO OH ) -f 2NH 2 C 6 H 4 CH 3 > CO OH ANTHRACENE DYESTUFFS 217 In order to render this product soluble, it is sul- phonated, when the sulphonic acid groups enter the toluidine nucleus, giving Alizarin Cyanine green.
By using a 1 : 5-disubstituted anthraquinone, the isomer, Anthraquinone violet, is produced : co NH c H - ^ CHq The reaction may also be made to take place in such a manner as to introduce two different amine residues in turn ; thus one may be aromatic, the other aliphatic, as in Alizarin Astrol : CO NH- CO NH CH 3 The constitution of these dyestuffs has been established by Friedlander and Schick (Zeitsch.


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