الفهرس 
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Abstract
Azo compounds have for great many years occupied dominant
position in the field of colouring matters due to their versitility. Azo dyes
containing at least one (N=N) sturcture in a molecule, are the most
important group of disperse dyes , and globaly comprise over 50 percent of
disperse dyes because of its strong tinctorial strength compared to
anthraquinone dyes, ease to make and a low cost of manufacture. Azo dyes
have a vivid colour in the yellow to blue green region because of varying
azo components with electronwithdrawing groups and coupling
components with electronwithdrawing groups. Among these, azo dyes
using heterocyclic amines have become important as they give brighter and
stronger results than these based on aniline -based diazo compounds .
Disperse dyes are organic colours with less water solubility, so they are
applied in colloidal aqueous dispersions to hydrophobic textile fibres in
which the dyes dissolve and produce the desired coloration.
Our synthesis began with the preparation of 7-Hydroxy-4-methyl-2Hchromen-
2-one (1) which acheived by the reaction of resorcinol with ethyl
acetoacetate and sulphoric acid [R].