Figure 4.

Comparison of 2nprop evolution spectra with three possible products of denitration. Based on the initial finding that a denitration (i.e., loss of an –NO₂ group) occurs under these conditions (i.e., see Fig. 1), an attempt was made to identify the 2nprop evolution product. Four ¹H-NMR spectra are overlaid and show the 2nprop evolution signal (bottom) and three possible products of denitration: propylene oxide, propionaldehyde, and propylene glycol. None of these three reference signals showed a match.