Abstract
The phenols 2-R 1 -6-R 2 -phenol 1a-g in which R 1 =R 2 =tert-butyl, methyl, isopropyl, Cl, Br, F, and H reacted with thianthrene cation radical perchlorate (Th .+ ClO 4 - ) to give 5-(4-hydroxyaryl)thianthreniumyl perchlorates 2a-g in good yield. o-Allylphenol (1i) behaved similarly. o-tert-Butylphenol (1h) gave both 5-(3-tert-butyl-4- hydroxyphenyl)thianthreniumyl perchlorate (2h) and a quinonoidal perchlorate (3), namely, 5-(3- thianthreniumyl-5-tert-butyl-6-oxo-2,4-cyclohexadien-1-ylidene)-5,5- dihydrothianthrene perchlorate
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