| 摘要 |
A process is provided for the preparation of an alpha -tocopherol derivatives which are useful as antisterile vitamins, hypolipidemic blood flow increasing agents, anti-cytosenility agents, antioxidants and the like. Catalysts are also provided. The alpha -tocopherol derivatives are represented by the following formula (VII): <IMAGE> (VII) wherein n stands for 0 or an integer of from 1 to 5. The derivative can be industrially prepared by employing as catalyst a metal ion-exchanged montmorillonite, metal ion-exchanged bentonite or metal ion-exchanged saponite which is substituted with one metal ion selected from the group consisting of scandium, yttrium, lanthanide element, aluminium, iron, tin, copper, titanium, zinc, nickel, gallium or zirconium.
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