Bayer Aktiengesellschaft

Alfred Brack

Roderich Raue

Horst Harnisch

Karl-Heinrich Lange

Horst Berneth

Karlheinrich Meisel

Hubertus Psaar

Hans-Peter Kuhlthau

Hauke Furstenwerth

Heinz Giesecke

Ernst Schmitt

Dyestuffs of the formula ##STR1## in which D is the radical of an aromatic or heterocyclic diazo component and

Process for the preparation of dyestuffs

Dyestuffs of the formula ##STR1## in which D is the radical of an aromatic or heterocyclic diazo component and K is the radical of an aromatic or heterocyclic coupling component, or is the radical of an active methylene compound, are obtained in an ecologically advantageous manner by reacting an aromatic or heterocyclic diazo components of the formula

The new cationic triazatrimethine dyestuffs of the formula ##STR1## wherein the substituents B, Z, R.sup.2 and An.sup..crclbar. have the meaning given in the description, are suitable for dyeing and printing naturally occurring and synthetic materials.

Cationic triazatrimethine dyestuffs

4,4-diaryldihydroquinazolones of the formula ##STR1## wherein X.sup.1, X.sup.2 and X.sup.3, independently of one another, denote hydrogen, halogen, alkyl, aryl, alkanoylamino, aroylamino, heteryl, NY.sup.1 Y.sup.2, OY.sup.3 or SY.sup.3, at least one of the radicals

Chromogenic 4,4-diaryldihydroquinazolones

Cationic diazacyanine dyestuffs of the formula ##STR1## and their mixtures with the isomeric dyestuffs of the formula ##STR2## wherein R represents methyl or ethyl and

Cationic diazacyanine dyestuffs for dyeing polyacrylonitrile-wool blends

4,4-diaryldihydroquinazolones of the formula ##STR1## wherein X.sup.1, X.sup.2 and X.sup.3, independently of one another, denote hydrogen, halogen, alkyl, aryl, alkanoylamino, aroylamino, heteryl, NY.sup.1 Y.sup.2, OY.sup.3 or SY.sup.3, at least one of the radicals X.sup.1, X.sup.2 or X.sup.3 standing for NY.sup.1 Y.sup.2, OY.sup.3 or SY.sup.3,

Chromogenic 4,4-diaryl-dihydroquinazolones of the formula ##STR1## wherein X.sup.1, X.sup.2 and X.sup.3 independently of one another represent hydrogen, halogen, alkyl, aryl, alkanoylamino, aroylamino, NY.sup.1 Y.sup.2, OY.sup.3 or SY.sup.3, and wherein

Chromogenic 4,4-diaryl-dihydroquinazolones, their preparation and their

Cationic dyestuffs of the general formula ##STR1## wherein R represents hydrogen or an alkyl radical with a maximum of 8 C atoms, which is optionally substituted by non-ionic radicals,

Cationic naphtholactam dyestuffs

Quinophthalone dyestuffs containing sulpho groups are obtained in a particularly advantageous manner by reacting a corresponding quinaldine derivative with a phthalic anhydride at 160.degree.-240.degree. C. in quinoline.

Process for the preparation of anionic quinophthalone dyestuffs

Pyridine-4-aldehyde phenylhydrazones are prepared by catalytic hydrogenation of 4-cyano-pyridine under normal pressure or almost normal pressure in the presence of phenylhydrazine or nuclear-substitution products thereof, in an aqueous medium in the absence of organic solvents, at a pH value between 9 and 12, preferably between 9.5 and 11, and in a temperature range from 0.degree. to 60.degree. C.

Process for the preparation of pyridine-4-aldehyde phenylhydrazones

Water-soluble cationic dyestuffs are prepared by the reaction of dyestuffs of the formula ##STR1## wherein R and R.sub.1 represent alkyl,

Process for the preparation of cationic naphtholactam dyestuffs

The invention relates to compounds of the formula ##STR1## wherein Z denotes OH or NR.sup.1 R.sup.2,

Benz-[c,d]-indolyl compounds

Cationic dyestuffs of the formula ##STR1## wherein A represents oxygen, sulphur or the groupings &gt;N--R.sub.3, ##STR2## wherein R.sub.3 denotes an alkyl, aryl or aralkyl radical,

Cationic dyestuffs

Acid-modified fibre materials may be dyed in brilliant color shades in accordance with the transfer printing principle if dyestuffs of the formula ##STR1## are used in which A is a residue of the formula ##STR2## wherein R.sub.1, R.sub.3, R.sub.4, R.sub.6 -R.sub.9 are H or lower alkyl, R and R.sub.2 are lower alkyl and R.sub.5 is phenyl. The resulting transfer prints are distinguished by good fastness to light, wet processing and rubbing.

Growing community of inventors

Odenthal, Germany

Alfred Brack