Studies in sesquiterpenes-XLIV 1: Isolongifolene (Part 5): Rearrangement of isolongifolene epoxide

Isolongifolene epoxide undergoes novel rearrangements on treatment with 1% HCl in CHCl<SUB>3</SUB> or on being exposed to active adsorbent (Al<SUB>2</SUB>O<SUB>3</SUB>, SiO<SUB>2</SUB>-gel). The latter reaction leads to tetracarbocylic derivatives. These reactions fully substantiate the stereochemistry assigned earlier to isolongifolene epoxide