Flash vacuum pyrolysis (FVP) of o-allyloxycinnamate esters gives benzofurans in high yield, via cyclisation of a phenoxyl radical and subsequent cleavage of the carboxylic ester function; coumarins are obtained by FVP of the corresponding phenols.
M. Black, J. I. G. Cadogan, G. A. Cartwright, H. McNab and A. D. MacPherson, J. Chem. Soc., Chem. Commun., 1993, 959 DOI: 10.1039/C39930000959
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