Polyazo compounds containing benzhydrol as a component

Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal

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260173, 260174, 260184, 260185, 260196, 260206, 260207, 260208, 260148, 260145C, 260512C, 260618B, 8 13, 260520R, D06P 139, C09B 3304, C09B 3318, C09B 4524

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active

039431223

ABSTRACT:
Azo dyestuffs of the formula: ##SPC1##
In which n is zero or 1, R represents a hydrogen atom or an alkyl or aryl group, A.sub.1, A.sub.2 and A.sub.3 each represent the residue of a diazotisable aromatic primary amine, which may be the same or different with at least one of these residues containing at least one sulphonic or carboxylic acid group, and the nucleus B is unsubstituted or substituted by one or two nitro, hydroxy or water-solubilising groups, metalliferous complexes of such dyestuffs and salts of the dyestuffs and of their metalliferous complexes. The dyestuffs of the above formula where n is zero may be prepared by a process which comprises coupling the diazo derivative of a diazotisable aromatic primary amine or the diazo derivatives of two different amines A.sub.1 NH.sub.2 and A.sub.2 NH.sub.2 with a coupling compound of the formula: ##SPC2##
In which B and R have the same meaning as in claim 1, at the rate of two molecules of amine to each molecule of coupling compound. The dyestuffs of the above formula where n is 1 may be prepared by a process which comprises coupling a coupling compound of the formula: ##SPC3##
In which B and R have the same meanings as in claim 1 with the diazo derivative of a diazotisable aromatic primary amine A.sub.1 --NH.sub.2, having a coupling position, at the rate of one molecule of amine to each molecule of coupling compound, then the monoazo dye thus obtained is coupled with the diazo derivative of a diazotisable aromatic primary amine or with the diazo derivatives of two different amines A.sub.2 --NH.sub.2 and A.sub.3 --NH.sub.2. The dyestuffs are particularly suitable for dyeing or finishing leathers.

REFERENCES:
patent: 2018234 (1935-10-01), Smith et al.
patent: 2061545 (1936-11-01), Bosshart et al.
patent: 2259735 (1941-10-01), Grossley et al.
patent: 2394114 (1946-02-01), Siebert et al.
patent: 2750375 (1956-06-01), Siebert et al.

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