The Manufacture and Production of New Azo Colouring Matters and of New Intermediate Products for the Production of such Colouring Matters.

摘要

16,581. Newton, H. E., [Farbenfabriken vorm. F. Bayer & Co.]. July 28. 1-Acetylamido-2 : 4-diamidobenzene and 1-acetylamido-2 : 4-diamido-6-methylbenzene are produced by reducing the corresponding dinitro compounds by mild reducing-agents, such as iron filings and dilute acetic or mineral acid. The reactions are terminated by heating, sodium carbonate is added, and the liquids are filtered. The diamido derivatives separate out from the condensed solutions on cooling. Amidobenzimidazoles.-On boiling the acetylamidodiamidobenzene with glacial acetic acid amidometbylbenzimidazole is produced. Dyes, artificial.-Trisazo dye-stuffs, which dye cotton shades of black, are produced by combining the tetrazotized azo dye-stuffs derived from one molecule each of a p-diamine and r-amidonaphthol sulphonic acid with either two molecules of one of the diamido derivatives described above, or one molecule of one of the diamido derivatives and one molecule of a suitable unsulphonated base. In an example, acetyl-p-phenylenediamine is diazotized, combined with gamma-amidonaphtholsulphonic acid, and the acetyl group is split off. The diamidomonoazo compound so produced is tetrazotized, and combined with two molecules of acetylamido diamido benzene, forming a dye which dyes unmordauted cotton black shades. In modifications, one molecule of the acetylamidodiamidobenzene is replaced by either m-toluylene-diamine, m-phenylenediamine, or 2 :4-diamido-anisol, jet - black dyes being produced. In other examples, the acetyl-pphenylenediamine is replaced by either diamidodiphenylamine, benzidine, or dianisidine. The tetrazo compounds so produced may be combined with the diamido bodies mentioned above, or with one of them and with alpha-napbthylamine. The dyes so produced dye jet black, violet black, and bluish black shades.