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Henry Edward Newton
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Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems
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Organic Low-Molecular-Weight Compounds And Preparation Thereof
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Abstract
20,649. Newton, H. E., [Farbenfabriken vorm. F. Bayer & Co.]. Sept. 8. Dyes, artificial.-Disulphonic acids of p-dihydroxylamine-anthrarufin and p-dihydroxylaminechrysazin, which dye unmordanted wool blue shades in an acid bath, and chrome-mordanted wool bluishgreen shades, are produced by reducing the disulphonic acids of p-dinitroanthrarufin and p-dinitrochrysazin with the calculated quantity of a reducing-agent, such as stannous chloride and hydrochloric acid. The new products are precipitated as ammonium salts by addition of excess of ammonium chloride or the like. Further reduction converts them into the corresponding diamido compounds.
GB189720649D1897-09-081897-09-08The Manufacture or Production of Coloring Matters derived from Anthraquinone.
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