Main Reaction: cinnamic acid >> 4-hydroxycinnamic acid

Reference: PubMed ID: 12818230
Authors: Russell WR, Burkitt MJ, Scobbie L, Chesson A
Title: Radical formation and coupling of hydroxycinnamic acids containing 1,2-dihydroxy substituents.
Published: 2003 Jun

cinnamic acid --> 4-hydroxycinnamic acid