ES351578A1 - Procedure for the preparation of disazoic compounds. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Procedure for the preparation of disazo compounds, which correspond to the general formula **(See formula)** where D is the radical of a monocyclic or bicyclic diazo component, A is a p-phenylene radical and R1 and R2 are each an alkyl radical, are linked through their coupling components by a divalent Z divalent bridge, for which one of at least the monoazo dye radicals is directly attached to the aromatic nucleus A, possibly by means of an alkylene bridge linked to the nucleus, with the bivalent radical Z, while the group Z, when D represents a heterocyclic system and Z contains two oxygen atoms directly linked to the phenylene radicals A or two carbonamidic groups linked through of the nitrogen atom directly with the phenylene radicals A, contains at the same time, either an unsaturated, aromatic or heterocyclic radical, or a carbon chain interrupted by at least one heteroatom, characterized: O well a) by coupling two coupling components **(See formula)** which are linked to each other by a bivalent bridge Z without dye character and of which at least one is linked directly in the aromatic nucleus A, possibly by means of an alkylene bridge linked in the nucleus, to the radical Z, with diazo compounds of amines D1-NH2 and D2-NH2, to form disazo compounds, and where D1 and D2 each signify the radical of a diazo component, possibly quaternized, O well b) by reacting, simultaneously in a single stage or consecutively in two stages, two dyes, the same or different, of the formula **(See formula)** where D and R1 have the same meaning as before, it means a 1,4-phenylene radical, R3 means an alkyl group (optionally substituted) or a hydrogen atom and in one of the radicals A1 and R3 are reactive substituents, with donor compounds of the radical Z. (Machine-translation by Google Translate, not legally binding)