in water-d2 under N2, pH 2.0; not isolated, monitored by IR, UV, NMR;

in ethanol byproducts: NaCl;

in water oxide, glacial acetic acid, H2O stirred while heating to 80-90°C until complete dissolution of oxide; cooled; acetate collected on filter; filtrate evapd. near dryness; combined; washed (hexane); filtered off; dried (vac. 1 Pa) for 3 h;