Dyes derived from aminothiophenes. Part 1: Synthesis of some heterocyclic disperse dyes using the Gewald reaction

  • Hallas G
  • Towns A
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A series of red to violet thienyl-2-azo disperse dyes has been derived from aminothiophenes synthesised directly by using the Gewald reaction. A variety of diazotisation conditions had to be employed owing to the differing basicities, hydrophobicities and stabilities of each thiophenamine.13C NMR data for certain derivatives are reported. Copyright © 1996 Elsevier Science Ltd.

Author-supplied keywords

  • Aminothiophenes
  • Disperse dyes
  • Gewald reaction
  • Heterocyclic azodyes
  • Synthesis

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