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Two convenient methods were developed to transformKMnO 4 into barium permanganate and other permanganate saltsvia BaMnO 4 or Mn 2 O 7 intermediates. Pure BaMnO 4 was preparedby the reaction of KMnO 4 with KI in the presence of BaCl 2 andNaOH. Hydrothermal reaction of barium manganate with excesscarbon dioxide for 1.5 h at 100 °C led to barium-permanganatewith almost quantitative yield. Mn 2 O 7 waspreparedbymeansofthe reaction of KMnO 4 and sulfuric acid monohydrate in a two-phase (CCl 4 -H 2 SO 4 .H 2 O) system. In the presence of excess barium Introduction Barium permanganate has been in use for a long time as auseful starting material (s 75 g/L in water at 18 °C, T dec 170 °C) for the preparation of other permanganate salts [1].It has also been applied as a selective solid phase oxidantin organic chemistry [2]. In spite of the widespread appli-cation, however, its convenient synthesis has not beenachieved yet. Potassium permanganate is the only commer-cially available permanganate compounds, but its trans-formation into pure barium permanganate cannot be per-formed directly [3]. Two synthetic precursor, however, na-mely BaMnO

A convenient method for the preparation of alkali- and chloride-free ammonium metavanadate has been developed. This new process is utilizing a hydrothermal reaction of vanadium pentoxide with ammon...