PHENOLIC SUBSTANCES 



193 



HO 



OH 



HO 



phloroglucinol 



(Sequoia sempervirens) 



HO 



/^%^n^ 







H 



p-hydroxybenzaldehyde 



HO 



HO 



COOH 



HO 



gallic acid 



H0-^^^^C-CH3 

 ~" O 



p-hydroxyacetophenone 



(Populus trichocarpa) 



H3CO 



HO-/ V-CH=CH— CH2OH 



coniferyl alcohol 



HO 



OH 



mociurin 



[Madura tinctoria) 



CH=CH— CO— O 



H/ 



HO' 



^H 



vH 



HO 



chlorogenlc acid 



H, 



,COOH 



OH 



H, 



{Coreopsis spp.) 

 Fig. 11-1. Structural formulas of some simple phenols. 



wherein genetic and biochemical mechanisms governing the synthesis 

 of certain chemical substances are yet undisclosed, it does not neces- 

 sarily follow that the compounds are accordingly of little value as 

 taxonomic criteria. 



