Azo dyestuffs containing indazolylazo radicals

  • Inventors:
  • Assignees: Ici Ltd
  • Publication Date: March 07, 1973
  • Publication Number: GB-1308917-A

Abstract

1308917 Indazoles; hydrazine derivative IMPERIAL CHEMICAL INDUSTRIES Ltd 4 Jan 1971 [26 Jan 1970] 3585/70 Heading C2C [Also in Division C4] 2 - Methyl - 3 - amino - 5,7 - dinitro - indazole is prepared by condensing hydrazine hydrate with 2-methoxy-3,5-dinitro-benzonitrile to yield 2 - cyano - 4,6 - dinitro - phenylhydrazine which is boiled with aq. HCl and sodium acetate to give 3-amino-5,7-dinitro-indazole which is treated with dimethyl sulphate in nitrobenzene. The following compounds are prepared using one or more of the preceding synthesis steps: 2-methyl- 5 - amino - indazole, 2 - methyl - 3 - amino - 5- nitro - 7 - (chloro - or bromo - ) - indazoles and 2- (ethyl or n-butyl)-3-amino-5,7-dinitroindazoles.

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Cited By (3)

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    EP-2108406-A1October 14, 2009DyStar Textilfarben GmbH & Co. Deutschland KGAnionische Farbstoffe und diese enthaltende Haarfärbezusammensetzungen
    WO-2009124872-A2October 15, 2009Dystar Textilfarben Gmbh & Co. Deutschland KgAnionic dyes and hair dye compositions containing them
    WO-2009124872-A3December 17, 2009Dystar Textilfarben Gmbh & Co. Deutschland KgAnionic dyes and hair dye compositions containing them