The products formed by reaction of arenethiols with diketen in the presence of sulphuric acid are β-arylthioisocrotonic acids and not, as has been reported, S-aryl thioacetoacetates (which can be prepared by base catalysis).
N. F. Yaggi and K. T. Douglas, J. Chem. Soc., Chem. Commun., 1977, 609 DOI: 10.1039/C39770000609
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