Sulfuric Acid → HCID 21276171, compound

Participants

Reaction Steps

1.2 ml (0.0078 mole) of 1,1,3,3-tetramethoxypropane and 0.2 ml (0.0034 mole) of 96 percent strength sulphuric acid are added in sequence to 3 g (0.0068 mole) of 5-hydrazino-4-(trifluoromethylsulphonyl)-1-(2,6-dichloro-4-trifluoromethyl-phenyl)-pyrazole in 7 ml of ethanol at 20° C. to 25° C. The reaction mixture is heated at the reflux temperature for 2 hours, cooled, and neutralized with 0.36 g (0.0034 mole) of sodium carbonate, and the solvent is removed in vacuo. The residue is suspended in water, filtered, washed again with water and dried. 2.5 g (77% of theory) of 1-(2,6-dichloro-4-trifluoromethyl-phenyl)-5-(pyrazol-1-yl)-4-trifluoromethylsulphonyl-pyrazole of melting point 127° C. to 133° C. are obtained.

Provenance & Evidence