300 MHz 1H N.m.r. and Mössbauer spectra of the solutions preapred by mixing catechol and iron(III) chloride in pyridine indicated clearly the formation of catecholato-FeIII and semiquinonato-FeII pyridine complexes in equilibrium, suggesting the probability of oxygenation of catechol via the latter.
T. Funabiki, S. Tada, T. Yoshioka, M. Takano and S. Yoshida, J. Chem. Soc., Chem. Commun., 1986, 1699 DOI: 10.1039/C39860001699
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