3.4- Dimethoxy-5-hydroxy-9,10-dihydrophenanthrene

Dimethoxy-5-hydroxy-9,10-dihydrophenanthrene (667) has been isolated from Riccardia jackii and its structure has been established by X-ray crystallographic analysis 212). 

Synthese von 2,4-Dimethoxy-6-hydroxy-9,10-dihydrophenanthren, by E. Hardegger, N. Rigassi, J. Seres, C. Egli, P. Muller, and K. O. Fitzi (29. Mitteilung, Welkstoffe und Antibiotika), Helv. Chim. Acta, 46 (1963) 2543-2551. 

Three novel phenanthrenes have been isolated from the wetland plant Juncus acutus. The structures of the novel phenanthrenes were established as 2-hydroxy-l,6-dimethyl-5-vinyl-phenanthrene (320), 2,7-dimethoxy-l,6-dimethyl-5-vinylphenanthrene (321) and 2-hydroxy-6-hydroxymethyl-l-methyl-5-vinyl-phenanthrene (322) [164, 165]. In spite of the great number of 9,10-dihydrophenanthrenes, only quite a small number of phenanthrenes have been reported until now as constituents of Juncaceae. 

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