naturally occurring hypocholesterolemic and antioxidant agent d-γ-tocotrienol ((2R), 3′-trans, 7′-trans-tocotrienol) differs from the relatedtocopherols (VitaminE) by possessing isoprenoid side-chain unsaturation. The presence of this unsaturation severely limits the chemistry available for tagging the substance. We were able to synthesize d-γ-tocotrienol-5-2H from the natural product by selective bromination