Abstract: Azo dyestuffs, which in the acid form, are represented by the formula:A -- N .dbd. N -- M -- N .dbd. N -- E (1)whereinA is an aromatic radical,M is a 1,4-benzene radical which may be substituted,E is the residue of a coupling component which is free from azo groups,At least one of A and M containing a phosphonic acid group, and the metal complexes of those having a metallisable group are reactive dyes suitable for use in the process of German OLS No. 2324809.

Abstract: Naphthalene compounds of the formula: ##STR1## WHEREIN M IS 0, 1 OR 2n is 0 or can be 1 if m is 1 or 2, in which case X.sub.1 is NH.sub.2 or OH in m position to a SO.sub.3 H groupX is a divalent alkylene, aralkylene or arylene radical, which may be substituted andp is 1 or 2.The new compounds are useful dyestuff intermediates, especially as coupling components for the manufacture of azo dyestuffs.This invention relates to new naphthalene compounds and more particularly to new naphthalene compounds valuable for use in the synthesis of dyestuffs.According to the invention, there are provided compounds of the formula: ##STR2## WHEREIN M IS 0, 1 OR 2n is 0 or can be 1 if m is 1 or 2, in which case X.sub.1 is NH.sub.2 or OH in m position to a SO.sub.3 H groupX is a divalent alkylene, aralkylene or arylene radical, which may be substituted, andp is 1 or 2.An alkylene group represented by X in formula (1) may be straight chain or branched, and may contain OH. It preferably contains less than 6 carbon atoms, e.g.