epoxy-8,14α sandaracopimarate de methyle;Methyl-8,14α-epoxy-sandaracopimarat;methyl (1R,4R,5R,9S,10R,13R,14S)-13-ethenyl-5,9,13-trimethyl-15-oxatetracyclo[8.5.0.01,14.04,9]pentadecane-5-carboxylate
Epoxidation of methyl esters of resin acids with the pimarane skeleton with p-nitroperbenzoic acid has permitted the isolation of epoxides of the intracyclic double bond. Allylic diterpenic alcohols were obtained by acid-catalysed isomerisation of diterpene epoxides, and the action of Collins reagent on these allylic alcohols has been studied.