Hoechst Aktiengesellschaft

Karl Sommer

Rudolf Schickfluss

Manfred Schneider

Hubert Kruse

Norbert Armbrecht

Process for preparing ring-substituted N-alkylanilines of the formula (1) ##STR1## in which R.sub.1 and R.sub.2 each denote methyl or ethyl, in a single vessel, which comprises acylating m-nitroaniline in an excess of an aliphatic carbonyl compound of the formula (2) ##STR2## in which R.sub.1 is as defined above, with an acylating agent which contains the --CO--R.sub.2 acyl radical--which is transferred-- and reductively alkylating the resulting compound of the formula (3) ##STR3## in which R.sub.2 is as defined above, at temperatures of 120.degree.-160.degree. C. under a hydrogen pressure of 20-150 bar without intermediate isolation through the presence of an acid reaction promoter and of a nickel catalyst.

Single-vessel process for preparing ring-substituted n-alkylanilines

Water soluble trisazo dyestuffs of the formula ##STR1## in which A is 1-amino-8-naphthol-3,6-disulfonic acid or 1-amino-8-naphthol-4,6-disulfonic acid, or a mixture of these two compounds, and B is 1-(3'- or 4'-aminophenyl)-3-methyl-5-pyrazolone, a process for their manufacture by diazotizing component A and coupling it with 3,3'-dihydroxy-diphenylamine to give a monoazo dyestuff, reacting this dyestuff with diazotized component B to give a disazo dyestuff, and converting this dyestuff to the trisazo dyestuff by uniting it with diazotized 4-nitro-4'-amino-diphenylamine-2-sulfonic acid, or by operating as described while, however, changing the sequence of reaction of component B and 4-nitro-4'-amino-diphenylamine-2-sulfonic acid, and use of these dyestuffs for the dyeing of leather and fur.

Water-soluble trisazo dyestuffs on the basis of a combination of

A dyeing-stable modification (.beta.-modification) of the dyestuff of the formula (I) ##STR1## which has the X-ray diffraction diagram shown in FIG. 1 and having the characteristic reflections at the following glancing angles and relative intensities:

Dyeing-stable monoazo dyestuff, a process for its preparation, and its

The modification being stable under dyeing conditions of the dyestuff of the formula ##STR1## characterized by an X-ray diffraction diagram with characteristic reflexes at the following glance angles .theta.with the relative intensities as given below:

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Konigstein, Germany

Karl Sommer