GB1471453A - Process for preparing reactive xanthene dyestuffs - Google Patents

Abstract

1471453 Reactive xanthene dyes HOECHST AG 24 July 1974 [24 July 1973] 32681/74 Addition to 1311023 Heading C4P Reactive xanthene dyes of the general formula wherein R and R<SP>1</SP> are H, halogen, hydroxy, alkyl, alkoxy, carboxy, or sulphonic acid, R 1 and R 2 are H, cyclohexyl, or alkyl optionally substituted by one or more halogen, hydroxy, carboxy, sulphonic acid, phenyl, -OSO 3 H and -NH-acyl groups, or R 1 and R 2 may with the N atom form an alkylene-imine ring optionally containing further hetero atoms, R 3 is H or alkyl, A is a mono- or bi-nuclear aromatic radical, Y is a group wherein R 4 is H or alkyl, Z is halogen, hydroxy, sulphato, phosphato, lower alkanoyloxy, or arylcarbonyloxy, m and n which may be different are 0, 1 or 2, q is 0 or 1 and p is 1 or 2 are prepared by reacting without isolation of an intermediate, one mol of a dihalogeno xanthene compound of the general formula wherein B is Cl or Br, with at least one mol of a compound or with at least one mole of an amine HN(R 1 )R 2 in a purely organic medium comprising carbamoyl groups or a polar aprotic solvent, at 0-140‹ C. optionally in presence of an acidbinding agent and then reacting the monocondensation product obtained without isolation, after neutralization of the acid formed with at least one mol of an amine of the above two formulae not previously used in the first monocondensation at 70-200‹ C. in presence of one or more acid binding agents and (a) optionally esterifying the terminal OH group where Z is OH or (b) converting the terminal -CH 2 CH 2 OH to a vinyl group by reaction with an alkaline agent. The dyes dye or print natural or regenerated cellulose, wool, silk, synthetic polyamide, polyurethane and leather.