Compelling UV–VIS and ESR spectroscopic evidence for the formation of the first stable allodial anion radical with strong π–π electron interaction (resonance) in perchloroorganic chemistry, the potassium (18-crown-6) salt of the perchloroethynylenebis(4-triphenylmethyl) anion radical, is presented and discussed.
V. M. Domingo, J. Castañer and J. Riera, J. Chem. Soc., Chem. Commun., 1994, 2521 DOI: 10.1039/C39940002521
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