The pyrolysis of trans-pentafluorocinnamic acid at 400° or the photolysis of sodium pentafluorocinnamate at 100° afford 5,6,7,8-tetrafluorocoumarin.
H. Heaney and A. P. Price, J. Chem. Soc. D, 1971, 894 DOI: 10.1039/C29710000894
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