Coumaric acid can be obtained from basic
hydrolysis of coumarin, through a reaction process consisting on opening the
lactone ring and cis-trans isomerization. Parameters such as reaction time, temperature,
NaOH concentration, solvent and reaction atmosphere, have been thoroughly
studied and analyzed, in order to determine the appropriate conditions for the
maximum conversion efficiency of coumarin into coumaric acid. Experimental
results show that the best conditions are a 1 hour reaction time, at 160℃, with a 20% sodium hydroxide
aqueous solution, and in an inert reaction atmosphere.
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