Modeling suberization with peroxidase-catalyzed polymerization of hydroxycinnamic acids: Cross-coupling and dimerization reactions

Peroxidase-catalyzed polymerization of hydroxycinnamic acid mixtures occurred most readily for caffeic acid with ferulic and sinapic acids, leading to the formation of β-β′-γ-lactone, β-5 benzofuran, and β-O-4 dehydrodimers.