Nitroxide free radicals have been produced by oxidation of pyrrolidine, piperidine, morpholine, and hexamethyleneimine. In six-membered rings, conformational changes are sufficiently slow to be studied by electron spin resonance. Activation energies for ring-inversion have been determined from the dependence of the e.s.r. spectra on temperature.
A. Hudson and H. A. Hussain, J. Chem. Soc. B, 1968, 251 DOI: 10.1039/J29680000251
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