AbstractWhen acting as an antioxidant, ethoxyquin is converted mainly to a 1,8′‐dimer and to a quinone‐imine, with the latter itself acting as a powerful antioxidant. The 8‐methyl derivative of ethoxyquin was prepared in the expectation that this would not form a dimer but more quinone‐imine and, therefore, be a more powerful antioxidant. On oxidation of 8‐methylethoxyquin, the dimer was absent and the quinone‐imine was formed in high yield. Despite this, 8‐methylethoxyquin was a less efficient antioxidant than ethoxyquin in fish oil and meal.
摘要乙氧基喹在作为抗氧化剂时,主要转化为 1,8′-二聚体和醌-亚胺,后者本身具有很强的抗氧化作用。制备乙氧基醌的 8-甲基衍生物是希望这种衍生物不会形成二聚体,而是形成更多的醌-亚胺,从而成为一种更强的抗氧化剂。在 8-甲基乙氧基喹的氧化过程中,二聚体不存在,而醌-亚胺的生成量很高。尽管如此,在鱼油和鱼粉中,8-甲基乙氧基醌的抗氧化效率低于乙氧基醌。