Synthesis of Dioxocarboxylic Acids J. Org. Chem., Vol. 39, No. 15, 1974 2289 ture was stirred at room temperature for 2 hr under nitrogen. The product was filtered under nitrogen, washed (D201, and dried (P206). I t had the same melting point as that of diprotio starting material. The nmr spectrum (DMSO-&) showed the absence of NH protons in the 9.5-10.5 ppm region. Kinetics of the Reaction. An approximately 0.1 M solution of the sodium salt of ...
