The monoprotonated tetrafluoro-p-benzosemiquinone radical has been prepared from the parent quinone by photochemically induced hydrogen-atom abstraction in a variety of solvents. The radical dissociates readily in hydroxylic solvents and in some cases rapid proton-transfer equilibria were observed which gave time-averaged e.s.r. spectra.
A. Hudson and J. W. Lewis, J. Chem. Soc. B, 1969, 531 DOI: 10.1039/J29690000531
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