Rhododendron linearifolium

Stereoisomers of hopane as the parent hydroearbon of about 100 naturally abundant hopane triterpenes are isolated in small amounts from oil slate and petroleum of various provenanee. Hydroxylated hopanes sueh as (-l-)-6a,22-hopanediol are found to oeeur in some liehens and, assoeiated with (-l-)-22(29)-hopen-6a,2ip-diol, in the roots of Iris missouriensis (Liliaeeae). Neohopanes exemplified by (-l-)-12-neo-hopen-3p-ol from Rhododendron linearifolium (Erieaeeae) rarely oeeur as natural produets. 

Various fernanes are reported as constituents of some ferns, e.g. (+)-7- and (-)-8-femene as well as (-)-7,9(ll)-femadiene from Adiantum monochlamys and A pedatum (Pteridaceae). Hydroxylated derivatives are found in lichens such as reti-geric acid A in Lobaria retigera (Sticataceae) and some higher plants, e.g. (-)-7-femen-3p-ol in Rhododendron linearifolium (Ericaceae) and (-)-3p,lip-dihydroxy-8-femen-7-one in Euphorbia supina (Euphorbiaceae). 

Nakamura, S., T. Yamada, H. Wada, Y. Inoue, T. Goto, and Y. Hirata The Structures of Five New Triterpenoids Obtained from Rhododendron linearifolium. Tetrahedron Letters 1965, 2017. 

---

See also in sourсe #XX -- [ , ]

---