Two convenient methods were developed to transform KMnO 4 into barium permanganate and other permanganate salts via BaMnO 4 or Mn 2 O 7 intermediates. Pure BaMnO 4 was prepared by the reaction of KMnO 4 with KI in the presence of BaCl 2 and NaOH. Hydrothermal reaction of barium manganate with excess carbon dioxide for 1.5 h at 100°C led to barium-permanganate with almost quantitative yield. Mn 2 O 7 was prepared by means of the reaction of KMnO 4 and sulfuric acid monohydrate in a two-1257 carbonate and catalytic amount of water barium permanganate could be obtained with a moderate yield. Similarly, other permanganate salts (Zn, Cd, Cu, Mg, Ca, Ni, Al, Fe, Ce, rare earth metals) were prepared by substituting the BaCO 3 for the appropriate metal oxides, hydroxides or carbonates.