Oxidation of vitamin E: evidence for competing autoxidation and peroxyl radical trapping reactions of the tocopheroxyl radical
作者:Daniel C. Liebler、Peter F. Baker、Kathryn L. Kaysen
DOI:10.1021/ja00175a037
日期:1990.9
Peroxyl radicals generated by thermolysis of azobis(2,4-dimethylvaleronitrile) (AMVN) in oxygenated acetonitrile reacted with d-α-tocopherol (vitamin E, 1) to produce 8a-[(2,4-dimethyl-1-nitrilopent-2-yl)dioxy]tocopherone (3a), 4a,5-epoxy-8a-hydroperoxytocopherone (4a), and 7,8-epoxy-8a-hydroperoxytocopherone (5a). When formed in acetonitrile/water (6:4, v/v), 4a and 5a hydrolyzed quantitatively to
由偶氮双(2,4-二甲基戊腈)(AMVN)在含氧乙腈中热解产生的过氧自由基与 d-α-生育酚(维生素 E,1)反应生成 8a-[(2,4-二甲基-1-nitrilopent-2) -基)二氧基]生育酚(3a)、4a,5-环氧-8a-氢过氧生育酚(4a)和7,8-环氧-8a-氢过氧生育酚(5a)。当在乙腈/水 (6:4, v/v) 中形成时,4a 和 5a 分别定量水解为 2,3-环氧-α-生育酚醌 (6) 和 5,6-环氧-α-生育酚醌 (7),而 3a 有限水解为 α-生育酚醌 (8)