Persulphate oxidation of (biphenyl-2-ylthio)acetic acids gave ArSĊR2 radicals which mainly cyclised to give monomeric and dimeric thiopyrans. The corresponding sulphonylacetic acid was less reactive giving a lower yield of cyclised product. Oxidation of (biphenyl-2-ylamino)acetic acids yielded only traces of cyclised products owing to the ease with which the intermediate ArNRĊH2 radicals were oxidised further to cations.
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Dewar et al. (1972) studied this question.
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