Cyclodehydration of p-chlorobenzoylthioglycollic acid and p-methoxybenzoylthioglycollic acid with trifluoroacetic anhydride gave anhydro-2-p-chlorophenyl- 5-hydroxy-4-trifluoroacetyl-1,3-oxathiolium hydroxide and the corresponding 2-p-methoxyphenyl derivative, respectively; these are the first examples of a 5-membered mesoionic ring system containing only oxygen and sulphur as nuclear heteroatoms.
K. T. Potts, J. Kane, E. Carnahan and U. P. Singh, J. Chem. Soc., Chem. Commun., 1975, 417 DOI: 10.1039/C39750000417
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