Didehydroferulic acid

Dimeric forms of ferulic and p-coumaric acids also occur in bound form within plant cell walls. The most common of these is didehydroferulic acid 23, which has been isolated from some plants of the Gramineae (53,54) and spinach cell cultures (7). While no such p-coumaric acid 2 derived dimer (i.e., C5-C5 linked) has ever been reported, cell walls of Lolium multiflorum contain another intriguing structural variation, namely 4,4 -dihydroxytruxillic acid 24 (5,55). 

Didehydroferulic Acid 23 Formation. It should be noted that no direct evidence has ever been obtained in vivo to prove that didehydroferulic acid 23 is formed via free radical coupling reactions. This mechanism is assumed, since in vitro incubation of ferulic acid 1 and wheat pentosan, with... 

---