98 



SOME MISCELLANEOUS UNSAPONIFIABLE LIPES 



CHo .OH / 



8 



OH 



HO-C X CCH 



n 3 

 



HO-C 



/\ 



CHj yCHj CH3 



0=C HOC^ 



I !! 



OH 



HC 



/\ 



CCH, 



I II 



OH 



CH 



However, it is possible that chromones could be formed by the addition of an acetate unit 

 to a phenylpropane intermediate (20). Tracer experiments should settle this point. 



Analogous to the furanocoumarins are furanochromones with the following basic 

 structure: 



Some structures of a few natural chromones are shown below: 



0\^CH. 



OH 



eugenin (Eugenia caryophyllata) 



CH< 

 \ 



CH, 



;C=CHCH 



OCHq 



peucenin (Peucedanum ostruthium) 



khellin (Amnii visnaga) 



