Treatment of the p-sulfinylphenol derivatives 1 and 5 with trifluoroacetic anhydride causes a Pummerer-type rearrangement on aromatic rings and concomitant desulfurization to give 1 : 1 mixtures of the corresponding p-quinones and p-dihydroquinones, which are subjected to mild oxidation to provide high yields of p-quinones 3 and 7.
S. Akai, Y. Takeda, K. Iio, Y. Yoshida and Y. Kita, J. Chem. Soc., Chem. Commun., 1995, 1013 DOI: 10.1039/C39950001013
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