Synthesa are delineated for the following three classes of nitroxyl (aminoxyl) labeled active esters:(1) phosphoric acid derivatives containing phenyl and p-nitrophenyl moieties,(2) EDTA and DTPA containing acetoxymethyl and (pivaloy1oxy) methyl as protecting groups, and (3) several amino acid derivatives containing the acetoxymethyl group. These compounds are expected to be of interest as potential probes in studies of intracellular ...