Polyphosphoric acid has been found to isomerize cis-p-methoxycinnamic acid to trans-p-methoxycinnamic acid and to cleave a benzyl ether; however, there is no evidence for the previously reported trans- to cis-isomerization of cinnamic acids.
J. Quick and C. Meltz, J. Chem. Soc., Chem. Commun., 1978, 355 DOI: 10.1039/C39780000355
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