Synthesis and Spectroscopic and Thermal Decomposition Studies of Alkali Metal Salts of 2-Oximidopropionate

Alkali metal and tetrabutylammonium salts of 2-oximidopropionic acid were prepared by the reaction of the free acid with the respective hydroxides or carbonates in water at room temperature. These compounds were characterized by infrared and multinuclear NMR spectroscopy and thermal gravimetric analysis. The thermal decomposition of the salts occurs in the range 96−131 °C and exhibit a trend toward lower temperature with increasing size of the cation. The molecular structure of the sodium 2-oximidopropionate hydrate was determined by single-crystal X-ray crystallography. Crystal data: C3H6NO4Na, M = 143.08, monoclinic, space group P21/c, a = 13.699(2) Å, b = 6.1577(7) Å, c = 6.633(1) Å, β = 103.09(2)°, V = 545.0(3) Å3, Z = 4, Dcalc = 1.74 g cm-3, R = 0.04, and Rw = 0.05.