| 摘要 |
A process for the preparation of azo dyes of formula <IMAGE> (1) wherein K is the radical of a coupling component of the benzene or naphthalene series or of the heterocyclic series, and the hydroxy group is attached to K adjacent to the azo group, X is hydrogen or nitro and M is an alkali metal ion or an ammonium ion, which process comprises coupling a diazo component of formula <IMAGE> (2) in the presence of a zinc salt and in an inert gas atmosphere, to a coupling component of formula <IMAGE> (3) in which formula (2) and (3) above K and X are as defined for formula (1). The process makes it possible to obtain the azo dyes in high yield.
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