Azo compounds having at least one 6-hydroxypyrid-2-one coupling component radical metal complexes thereof and intermediates therefor

摘要

A compound of formula I <IMAGE> (I) in metal-free; 1:1 or 1:2 metal complex form and, when an acid group is present, in free acid or acid addition salt form, in which R1 is hydrogen or -N=N-D where D is a diazo component and R, T and B are organic radicals defined in the text.