(16) The preparation of 2-alkylimino-3-alkyl-4-oxazolidinones from N, N'- dialkylcarbodiiinides and a-hydroxy esters in the presence of cuprous (ic) chloride has been described.* Our work, using sodium hydride as the condensing agent, was performed before we knew of these results. The reaction of hr, N'-dimethylcarbodiimide with hydrazoic acid is described by DF Percival and R. hf. Herbst, J.
