Abstract: Both grevillic(2,5-dihydroxy-trαns-cinnamic) acid and grevillone(6- hydroxycoumarin) were only found from Grevillea robusta A.Cunn.(Protea- ceae)thus far in the plant kingdom.It is of interest from biogenetic viewpoint that their hydroxylation pattern shows to be quite special.Basically, the problem of the biogenesis of grevillic acid and grevilione is this: by what enzymic pathway is this special hydroxylation pattern formed from trans-cinnamic acid in the plant?In the present paper,an attempt is made to suggest the mechanism of the possible biosynthetic pathway for conversion of trans-cinnamic acid via grevillic acid to grevillone in the plant.Our suggestion is based on evidenceof an indirect and structural character, and not purely speculative.

Key words: Biogenesis-grevillic-gevillone