Synthesis of 6- Halo - 4- hydroxyl- 2- quinolone and Their Azo Disperse Dyes

Dianilides 1 and 2 derived from concerned substituted anilines were transformed to corresponding coupling components 3 and 4in good yields using melted AlCl3.These compounds were coupled with diazotized aryl and heteroaryl amines to give tocorresponding azo dyes 5a-d and 6a-d. The structure of the new azo dyes was confirmed by UV-Vis, FT-IR, 1H NMRspectroscopic techniques. The solvatochromism of dyes was evaluated with respect to wavelength of maximum absorption (0max)in six solvents: acetic acid, ethanol, chloroform, acetonitrile, dimethyl sulfoxide and dimethyl formamide. The color of the dyes isdiscussed with respect to the nature of cyclic and heterocyclic ring and substituents therein. The effects of acid and base on thevisible absorption spectra of the dyes are also reported. J. Color Sci. Tech. 4(2010), 83-90© Institute for Color Science andTechnology.