Superacidic cyclization of higher terpenoid acids and their esters

Article abstract of DOI:10.1007/BF00713614

The superacidic cyclization of aliphatic and partially cyclized C15-C25 terpenoid acids and their esters proceeds structure-selectively and stereospecifically, affording α-isomers of completely cyclized epimeric β,γ-unsaturated acids or esters; the configuration of their carboxylic or ester groups is predetermined by the configuration of the double bond conjugated with the carboxyl or ester groups in the starting compounds. - Key words: terpenoids; acids; esters, superacidic cyclization, selectivity.