Hydrogen Peroxide → HCID 18975618, compound

Participants

Reaction Steps

Hydrogen peroxide (30% solution in water, 120 ml) is slowly added to a well stirred suspension of 1-(2,5-dichlorophenyl)-3-pyrazolidone (200 g, 0.86 mol) and selenium dioxide (3.0 g) in acetic acid (1000 ml). The temperature is controlled by cooling, not to exceed +50° C. After stirring at this temperature for 1 hour crushed ice and water is added. The product is filtered and dried yielding 1-(2,5-dichlorophenyl)-3-pyrazolone, m.p. 201°-202° C.

Provenance & Evidence