Synthesis and Studies of Some Disperse Dyes Derived from 5-Pyrazolone-3-methyl-1-(m-nitrophenyl)

摘要

The synthesis of a series of disperse dyes derived from 5-pyrazolone-3-methyl-1-(m-nitrophenyl) is described. The colour fastness of these dyes to washing, dry-heat and to artificial light (Xenon arc fading lamp) are reported and found to depend on the influence of the substituents on the electron density around the azo-group. The visible absorption spectra of all the dyes showed that the colours of these dyes lie in the range of yellow-orange-red.