Pyridone compounds and the preparation of disulfonated pyridone compounds

Abstract

There are described benzophenoneazo dyes of the formula ##STR1## where the ring A can be benzofused and a benzofused ring A can be overbridged, m is 1 or 2, K is the radical of a coupling component, Y is hydrogen or arylazo, one of the two radicals X.sup.1 and X.sup.2 is hydrogen and the other is hydroxysulfonyl, R.sup.1, R.sup.2 and R.sup.3 are independently of the others hydrogen, halogen, C.sub.1 -C.sub.12 -alkyl, cyclohexyl, phenyl, 2-hydroxyethylsulfonyl or C.sub.1 -C.sub.4 -alkoxy or, when m is 1 and Y is hydrogen, one of these substituents can also be the radical of the formula ##STR2## where L.sup.1 is a chemical bond or a bridge member, and X.sup.1, X.sup.2, R.sup.4, K and the ring A are each as defined above, and R.sup.4 is hydrogen, halogen or C.sub.1 -C.sub.4 -alkoxy, with the proviso that there is at least one water-solubilizing group in the molecule, novel pyridone compounds, a process for preparing disulfonated pyridone compounds, and the use of the novel dyes for dyeing natural or synthetic substrates.

Dependencies are inferred from the claim text.