NMR spectroscopy was used to further confirm the furfural structure, and resuts were compared to information published in the literature. Signals corresponding to the aromatic protons (6.6-7.7 ppm), aldehyde proton (9.5-10.0 ppm), and methylene protons (4.0-4.5 ppm) connected to the oxygen in the C-O-C group were detected in the proton NMR (¹H NMR) spectra. These spectra verified the furfural presence in the distillates and were in good accord with the levels reported in the literature .