Synthesis of some novel arylazo disperse dyes derived from 5-amino-tetrazolo[1,5-a]pyrimidin-7-ol as coupling component and investigation of their absorption spectra

摘要

5-amino-tetrazolo[1,5-a]pyrimidin-7-ol (I) was synthesized by reaction of 5-amino-tetrazole with ethyl cyanoacetate in excellent yield. A series of novel 5-amino-6-arylazotetrazolo[1,5-a]pyrimidin-7-ol dyes were prepared by linking o-, m-, p-anisidine, o-, m-, p-chloroaniline, o-, m-, p-nitroaniline, o-, m-, p-toluidine and aniline to 5-amino-tetrazolo[1,5-a]pyrimidin-7-ol (I). The structure of these dyes were confirmed by UV-vis, FTIR and ~1H NMR spectroscopic techniques and elemental analysis. The effect of varying pH and solvent upon the absorption ability of 5-amino-6-arylazotetrazolo[1,5-a] pyrimidin-7-ol sudstituted with electron-withdrawing and electron-donating groups at their o-, m-, p-position was examined.