Microwave-assisted oxidation of 1,3,5-trisubstituted 4,5-dihydro-1H-pyrazoles to the corresponding pyrazoles with poly(N,N′-dibromobenzene-1,3-disulfonamide-1,2-ethanediyl)

The title reaction gives pyrazoles in good yields under microwave irradiation when compared with conventional long-time conditions at room temperature.