N-(4-biphenylyl) acetohydroxamic acid (12b) and N-(2-fluorenyl) acetohydroxamic acid (13b), could be easily prepared. Under both conditions, the order of koW for the reactions of nitrosobenzene (2) with a-oxo acids la-d was glyoxylic (la)> pyruvic (lb) 2 2-oxobutyric (IC)> benzoylformic (la) acid. For the reactions of substituted nitrosobenzenes 3-6 with pyruvic acid (lb), the order of kom was p-phenyl (6)> unsubstituted (2)> p-chloro (5)> m-chloro (4) ...
