The radical formed from 13CO labelled tetramethylurea in CFCl3 solutions on exposure to 60Co γ-rays at 77 K exhibits a nearly isotropic 13C coupling of ca. 10 G in its e.s.r. spectrum, and hence it must be the parent radical cation Me2N–(CONMe2)+˙ as suggested by Williams and his co-workers.
C. J. Rhodes, I. D. Podmore and M. C. R. Symons, J. Chem. Soc., Chem. Commun., 1987, 1638 DOI: 10.1039/C39870001638
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