air in neat (no solvent) passing 120 litre humid air over white P in 6 d at ambient temp., 1percent of the P are converted into H3PO2, 15-21percent into H3PO3, 72-77percent into H3PO4 and6-8percent into H4P2O6;;
in water byproducts: Ca-oxalate; addn. of a soln. of oxalic acid to a soln. of Ca(H2PO2)2; pptn. in coldness;; removal of Ca-oxalate impurities by heating at 100 °C, standing for 5 days and by repeated filtration;;
Zn in hydrogenchloride; ethanol byproducts: Zn(2+); Electrochem. Process; in cell with Pb cathode and Zn anode; P4 suspended in H2O/EtOH (2:1), warmed to 60°C under N2; 0.5 mL 2 M HCl added; current (150 mA) applied for 30 min, 1.5 mL HCl added, stirred at 60°C; detd. by (14)P NMR;
参考文献
Angewandte Chemie - International Edition, , vol. 50, # 23 p. 5370 - 5373
in not given react. of Ba-hypophosphite and H2SO4;; concentrating to 1/10 of the volume in a porcelain cup; heating in a Pt dish slowly at 105 °C; filtration and heating at 130 °C; solidification with a freezing mixture; content: 98 percent H3PO2, impured with H3PO3 and H3PO4;;
