Structural investigation of lac resin. Part 12. 10-epi- and 2-epi, 10-epi-Shellolic acids and some allylic rearrangements
Abstract
The nature, reactivity, and acid-catalysed isomerisations of the allyl system in shellolic acid and its 2-epimer are discussed. The configurations of substituents at C-10 in these cedrene derivatives are correlated with their spectral characteristics. The relevance of the results to the complexity of shellac is indicated.