A novel and efficient cerium catalyzed tandem oxidation and intermolecular ring cyclization of vicinal diols with hydrazones has been achieved for the regioselective synthesis of pyrazole derivatives. The corresponding 1,3-di and 1,3,5-trisubstituted pyrazoles were obtained in moderate to excellent yields and the cyclization proceeds through a radical mechanistic pathway. The reaction has the advantage of mild conditions, easily available starting materials, broad substrate scope and exhibit good functional group tolerance.

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