Figure 3.
(A) Crystal structure of 5a confirming the oxadiazole-4N-oxide ring configuration. (B) HPLC-PDA analysis demonstrating differences in relative polarity and UV absorption properties for ODZ-2N and ODZ-4N furoxans 4a and 5a, respectively. Chromatograms represent overlay of UV signal at 254 nm with PDA analysis of the representative portion of the chromatogram shown above each peak.