in neat (no solvent)
heating an excess of H3PO3 with Br2 in a sealed tube at 100 °C;;
参考文献
Gustavson, G.
Bull. Acad. Imp. Sci. St. - Petersbourg, 1867 , vol. 11, p. 299 - 301
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Gustavson, G.
J. prf. Ch., 1867 , vol. 101, p. 123 - 125