Photobleaching and other experiments show that the radical species generated on γ-irradition of Freon solutions of tetramethylurea is the parent radical cation and not the dimethylaminyl radical assigned previously; the e.s.r. parameters and other properties of this cation are consistent with a 2A′ nitrogen-centred radical formed by twisting one of the NMe2 groups perpendicular to the molecular plane.
X. Qin, T. C. Pentecost, J. T. Wang and F. Williams, J. Chem. Soc., Chem. Commun., 1987, 450 DOI: 10.1039/C39870000450
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