NUCLEAR MAGNETIC RESONANCE SPECTRA OF ORGANIC PEROXIDES

The NMR spectra of approximately twenty highly purified organic peroxides (hydroperoxides, peroxy acids, dialkyl peroxides, t-butyl peroxyesters, and diacyl peroxides) and selected nonperoxidic analogs have been determined. The signal of the hydroperoxy proton is considerably downfieid from that of the hydroxyl proton, and its position is also concentration dependent. The upfield shift of the signal of the hydroperoxy proton with dilution is of much smaller magnitude than that in alcohols. The proton of the peroxycarboxylic acid group is even more deshielded than the hydroperoxy proton but its chemical shift is independent of concentration. The correlation between increasing acidity and down-field shift of the acidic proton has now been extended to include hydroperoxides and peroxy acids. The NMR spectra of the other classes of peroxides studied are generally not significantly different from those of their nonperoxidic analogs. © 1969, American Chemical Society. All rights reserved.