1: 3-methyl-1H-pyrazole With iodine; iodic acid in tetrachloromethane; water; acetic acid T=50°C; 1.5 h; 2: dimethyl sulfate With sodium hydroxide; tetra(n-butyl)ammonium hydrogensulfate in dichloromethane; water T=20°C; Further stages.;

sodium nitrate; sodium hydrogencarbonate; potassium iodide in chloroform; water T=30°C; Electrolysis;

potassium permanganate in water T=60°C;

nitric acid in tetrahydrofuran T=20°C; 2 h;