Xanthoria resendei

Deriv Fern-9(ll)-ene-3p,12a-diol, mp 208-209 °C (MeOH), by saponification of 12 a-acetoxyfern-9(ll)-en-3P-ol with KOH-MeOH under reflux in 30 min StL Xanthoria resendei Poelt et C.N.Tav. 

Deriv 3p,12a-Diacetoxyfern-9(ll)-en, mp 186-188 °C (MeOH), [aj + 99 (CHCI3, c 0.24), from Fern-9(ll)-en-3(3,12a-diol with ACjO-pyridine StL Xanthoria resendei Poelt et Tav. 

Goh EM, Wilkins AL, Holland PT (1979) Structural elucidation of a new group of secostictane triterpenoids. J Chem Soc Perkin Trans 1 1560-1564 Gollapudi SR, Telikepalli H, Jampani HB, Mirhom YW, Drake SD, Bhattiprolu KR, van der Velde D, Mitscher LA (1994) Alectosarmentin, a new antimicrobial dibenzofuran lactol from the lichen, Alectoria sarmentosa. J Natural Prod 57 934-938 Gonzalez AG, Martin JD, Perez C (1974) Three new triterpenes from the lichen Xanthoria resendei. Phytochemistry 13 1547-1549... 

Gonzalez, Martin, and Perez 148) identified three new fernene derivatives from Xanthoria resendei 12a-acetoxy-3p-hydroxyfern-9(ll)-ene (498), 3p,12a-dihydroxyfern-9(l l)-ene (499) and 3,12-diketofern-9(l 1)-ene (500). The structures of these triterpenes were deduced from spectral evidence and confirmed by chemical interconversion and the Wolff-Kishner reduction of (500) to the parent fern-9(ll)-ene. 

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