The Most Important Classes of Phenolic Compounds in Plants

• Simple phenols and benzoquinones


  C6
• Phenolic acids


  C6-C1
• Acetophenone and phenylacetic acids


  C6-C2
• Hydroxycinnamic acid, polypropene, coumarin, and isocoumarin


  C6-C3
• Naphtoquinone


  C6-C4
• Xanthone


  C6-C1-C6
• Stilbene and anthrachinone


  C6-C2-C6
• xanthone 


  C6 - C3 - C6
• Flavonoids and isoflavonoids


  (C6-C3)2
• Biflavonoids


  (C6-C3-C6)2
• Lignins and catecholamines (condensed tannins)


  (C6-C3)n ; (C6)n ; (C6-C3-C6)n