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Pentacyclic triterpenes hydroxylation

The pentacyclic triterpene skeleton hopane is generated by 2,7-, 6,11-, 10,15-, 14,19-, and 18,22-cyclization of the carbenium ion in a fivefold chair conformation (as drawn) arising from regioselective protonation of the 2,3-double bond of squalene (but not of the 2,3-epoxide). This explains why hopanes are usually not hydroxylated in the 3-position. [Pg.101]

See other pages where Pentacyclic triterpenes hydroxylation is mentioned: [Pg.474]    [Pg.765]    [Pg.642]    [Pg.246]    [Pg.474]    [Pg.241]    [Pg.278]    [Pg.458]    [Pg.484]    [Pg.288]    [Pg.310]    [Pg.675]    [Pg.94]    [Pg.620]    [Pg.242]   
See also in sourсe #XX -- [ Pg.680 ]



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Pentacycles

Triterpenes

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