2,5-Dihydroxycinnamic acid, C6H3(OH)2.CH:CH.CO2H, obtainedby oxidising a 5% solution of o-coumaric acid in excess of sodiumhydroxide with a 10%
solution of potassium persulphate and hydrolysing the alkyl sulphate thus formed with concentrated hydrochloric acid, has m. p. 207" (decornp.)
Cain, J.C.; Greenaway, A.J. (1907). "Abstracts of Papers on Organic chemistry". Journal of the Chemical Society,
abstracts 92: A741–A812. doi:10.1039/CA9079200741
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