Organic compounds -- part of the class 532-570 series – Organic compounds – Azo
Patent
1989-08-23
1991-03-26
Higel, Floyd D.
Organic compounds -- part of the class 532-570 series
Organic compounds
Azo
534565, 534582, 534602, 534792, 534839, 534878, 534879, 534883, 534887, C09B 4100, C09B 2916, C09B 2950, C09B 2930
Patent
active
050030515
ABSTRACT:
A process for the preparation of azo dyes of the formula ##STR1## in which X is --NH.sub.2 or --OH, A is a benzene or naphthalene radical which can be substituted by nitro, halogen, sulfo, C.sub.2 -C.sub.6 alkanoylamino, C.sub.1 -C.sub.6 -alkoxycarbonylamino, sulfonamido and sulfone groups and B is a benzene radical which is monosubstituted or disubstituted by C.sub.1 -C.sub.6 alkyl, or a naphthalene radical which can be substituted by amino, phenylamino, C.sub.1 -C.sub.6 alkylamino and sulfo, or a 1-phenyl-3-methyl-5-pyrazlone radical which can be substituted by halogen, C.sub.1 -C.sub.6 alkyl and C.sub.1 -C.sub.6 alkoy, these radicals being bound to the azo group in the o-position with respect to the hydroxyl or amino groups, comprises diazotizing in aqueous solution an amine of the formula ##STR2## in the presence of at least one ketone of the formula ##STR3## in which R.sub.1 and R.sub.2, independently of one another, are each C.sub.1 -C.sub.4 alkyl, and coupling the product on to a coupling component of the formula ##STR4## in which A, B and X in formulae (2) and (4) are as defined in formula (1). The present invention makes it possible to prepare the azo dyes mentioned in high yields.
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Loew Peter
Puntener Alois
Schlesinger Ulrich
Ciba-Geigy Corporation
Dohmann George R.
Higel Floyd D.
McC. Roberts Edward
Powers Fiona T.
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