| 摘要 |
Novel compounds which have the formula I <IMAGE> (I) in which D is the residue of a diazo component, K is the residue of a coupling component, A is an unsubstituted or substituted 1,3- or 1,4-phenylene radical or an unsubstituted or substituted 1,4-naphthylene radical, X is an oxygen atom or sulphur atom, R is a group conferring solubility in water and n and m are each the numbers 0 or 1, with the proviso that if A is a 1,3-phenylene radical the symbol X is bonded in the p-position relative to the amino group or azo grouping of the ring B.
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