1. AZOCOUPLING PRODUCTS. III. SPECTROSCOPIC INVESTIGATION AND SYNTHESIS OF SOME AZOCOUPLING PRODUCTS BETWEEN 1-(4-HYDROXY-6-METHYL-PYRIMIDIN-2-YL)-3-METHYL-PYRAZOLIN-5-ONE AND AROMATIC DIAZONIUM SALTS. Authors: IOAN PANEA, ADINA GHIRIȘAN, FLORIN IURA, RADU GROPEANU, IOAN ALEXANDRU SILBERG.