The Manufacture of Organic Dyestuffs
The Manufacture of Organic Dyestuffs
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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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To quickly assess the difficulty of the text, read a short excerpt:
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.
What to read after The Manufacture of Organic Dyestuffs?
You can find similar books in the "Read Also" column, or choose other free books by Andr Wahl to read onlineMoreLess
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