Bayer Aktiengesellschaft

Hermann Goebel

Winfried Mennicke

Erich Kramer

Kurt Eitel

Metal complexes of disazo dyestuffs of the formula ##STR1## wherein one X=chlorine and the other X=NO.sub.2, or

Metal complex dyestuffs, processes for their preparation and their use

Iron complexes of azo dyestuffs of the formula ##STR1## wherein R.sub.1 and R.sub.2 have the meaning indicated in the description, and their use for dyeing or printing various fibre materials, for example wool, silk and synthetic materials such as Perlon, but especially leather. The dyeings obtained are distinguished by good fastness properties.

Iron complex azo dyestuffs

The compound which corresponds to the formula ##STR1## is suitable for the preparation of azo dyestuffs.

Benzotriazoles useful as azo dyestuff intermediates

The subject matter of the present invention relates to tetrakisazo dyestuffs which in the acid form correspond to the formula ##STR1## wherein Z.sub.1, Z.sub.2 = an optionally substituted amino group

Tetrakisazo dyestuffs

The subject matter of the present invention relates to tetrakisazo dyestuffs which in the acid form correspond to the formula ##STR1## wherein R = H or substituent,

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Leverkusen, Germany

Hermann Goebel