Abstract
Oxidation reaction of d-δ-tocopherol (I) and δ-tocopherol model compound (II) are carried out with silver nitrate as oxidizing agent in ethyl alcohol. Three novel oxidation products are isolated and characterized. They are atropisomers of (+)-5-(δ-tocopherol-5'-yl)-δ-tocopherol (VII, with R-configuration at C5-C5' position, IX with S-configuration at C5-C5' position), and 5-(6'-hydroxy-2', 2', 8'-trimethylchroman-5'-yl)-6-hydroxy-2, 2, 8-trimethylchroman (XI).
