Electrogenerated acid as a powerful catalyst for transformation of epoxides to ketones and acetonides

Electrochemical Transformation of epoxides 1 to ketones 2 and acetonides 3 were achieved by using an electrogenerated acid-catalyst. A combination of M(ClO4)n [ M; Li, Na, Mg, n = 1, 2] with polar aprotic solvents [CH2Cl2, ClCH2CH2Cl, THF, CH3COCH3, AcOEt, (MeO)2CO ] is useful for the electrochemical transformation.