| abstract |
Procedure for the preparation of monoazo pigments, of the formula ** (See formula) ** in which R1 signifies an H atom, an alkyl group with 1 to 4 C atoms, or an aryl radical; R2 means an H atom, an alkyl group with 1 to 4 C atoms, an aralkyl radical or an aryl radical; either the radicals R1 and R2 together with the N atom, form a pentagonal or hexagonal heterocyclic ring; R3 means an H or halogen atom or an alkyl group with 1 to 4 C atoms; R4 and R5 signify H atoms, alkyl groups with 1 to 4 C atoms or phenyl groups (optionally substituted by halogen atoms or by alkyl or alkoxy groups with 1 to 4 C atoms); X signifies an O atom or an imine group; Y means an O or S atom or an imine group; Z means a halogen atom, an alkyl or alkoxy group with 1 to 4 C atoms, or an aryloxy group; and the carbonamide group is in the meta or para position with respect to the azo group, characterized by the coupling of a diazo or diazoamine compound of an amine of the formula ** (See formula) ** with a diazine of the formula (see formula) (Machine-translation by Google Translate, not legally binding) |