The tocopherols are derivatives of tocol, and the occurrence of a num ber of related substances in animal and vegetable products has been demonstrated. Cottonseed oil was found to contain a B-, and Y tocopherol, and a fourth, 8-tocopherol, was isolated from soybean oil. Several other tocopherols were found in other products and Morton (1967) suggests that there are four tocopherols and four tocotrienols. The tocotrienols have three unsaturated isoprenoid groups in the side chain.The structure of tocol is given in Figure 9.4 and the structures of the tocopherols and tocotrienols in Figure 9.5. Morton (1967) has sum-marized the chemistry of the tocopherols as shown in Figure 9.6.