The Chemistry of the Coal Tar Colours
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Flavopurpiiriii forms yellow needles, which melt above 330° and can be sublimated.
It is almost insoluble in water, but dissolves easily in cold alcohol. * Its solutions in alkalies are redder still than those of anihrapurpurin ; the solution in ammonia is yellowish- red, while that of anthrapurpurin is violet. A boiling solution of alum does not dissolve it.
Purpurin, Purpurin, Ci4H502(OH)3, is isomeric with anthrapur- purin and flavopurpurin, and was the first trioxyanthra- quinon known. Alth...ough it is not a constituent of artificial alizarin, it will be described here, since after alizarin, it is the most important constituent of madder, and the results obtained in dyeing with artificial alizarin and with madder are often compared with each other.
Purpurin differs from its two isomers in having all the three hydroxyl groups in one benzene ring. Their relative position is shown in the formula : — ■X^^ " ^X^ c OH Lalande has devised a method for the preparation of purpurin from alizarin.
What to read after The Chemistry of the Coal Tar Colours?
You can find similar books in the "Read Also" column, or choose other free books by Rudolf Benedikt to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Flavopurpiiriii forms yellow needles, which melt above 330° and can be sublimated.
It is almost insoluble in water, but dissolves easily in cold alcohol. * Its solutions in alkalies are redder still than those of anihrapurpurin ; the solution in ammonia is yellowish- red, while that of anthrapurpurin is violet. A boiling solution of alum does not dissolve it.
Purpurin, Purpurin, Ci4H502(OH)3, is isomeric with anthrapur- purin and flavopurpurin, and was the first trioxyanthra- quinon known. Alth...ough it is not a constituent of artificial alizarin, it will be described here, since after alizarin, it is the most important constituent of madder, and the results obtained in dyeing with artificial alizarin and with madder are often compared with each other.
Purpurin differs from its two isomers in having all the three hydroxyl groups in one benzene ring. Their relative position is shown in the formula : — ■X^^ " ^X^ c OH Lalande has devised a method for the preparation of purpurin from alizarin.
What to read after The Chemistry of the Coal Tar Colours?
You can find similar books in the "Read Also" column, or choose other free books by Rudolf Benedikt to read onlineMoreLess
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