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 |
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| Authors: | Jun‐Bao Liu Yuan Lu Chao‐Jun Chen Shi‐Kui Wu Meng‐Shen Cai |
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| Institution: | 1. Department of Pharmaceutical Sciences, Inner Mongolia Medical College, , Hohhot, 010059 People's Republic of China;2. School of Pharmaceutical Sciences, Peking University, , Beijing, 10083 People's Republic of China |
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| Abstract: | 5‐amino‐tetrazolo1,5‐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‐arylazotetrazolo1,5‐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‐tetrazolo1,5‐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‐arylazotetrazolo1,5‐a]pyrimidin‐7‐ol sudstituted with electron‐withdrawing and electron‐donating groups at their o‐, m‐, p‐position was examined. |
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