In contradiction to an earlier report we have found that chromium pentoxide etherate solution oxidises tetraphenylcyclopentadienone to a known keto-lactone, which can be obtained more efficiently by chromic acid oxidation; we have been unable to prepare the earlier claimed peroxide.
J. E. Baldwin, J. C. Swallow and H. W.-S. Chan, J. Chem. Soc. D, 1971, 1407 DOI: 10.1039/C29710001407
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