The formation of 2-chloro-2-trifluoromethylcyclopentane-1,3-dione (1) in the chlorous acid oxidation of 2- and 3-trifluoromethylphenol is shown to proceed via decarboxylation of 5-chloro-1-hydroxy-4-oxo-5-trifluoromethylcyclopent-2-enecarboxylic acid (4), an isolable compound.
J. Blazejewski, R. Dorme and C. Wakselman, J. Chem. Soc., Perkin Trans. 1, 1987, 1861 DOI: 10.1039/P19870001861
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