Treatment of mesoionic 1,3-oxazolium-5-olates with amidines causes a novel ring transformation affording 5-trifluoroacetyl- and 5-perfluoroacyl-imidazoles in moderate yields.
M. Kawase, J. Chem. Soc., Chem. Commun., 1994, 2101 DOI: 10.1039/C39940002101
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