一个稳定自由基的酮-烯醇互变异构——三(2-去氧-2-L-抗坏血酸基)胺自由基负离子的ESR和ENDOR研究

Keto-Enol Tautomerism of a Stable Free Radical——ESR and ENDOR Study on Tri(2-Deoxy-2-L-Ascorbyl)Amine Radical Anion

在pH8.95的缓冲溶液中氧化三(2-去氧-2-L-抗坏血酸基)胺得一对应的自由基负离子,对其进行了ESR和ENDOR研究。结果表明该自由基负离子在溶液中以酮-烯醇互变异构体存在,这可能是在稳定自由基中发现存在酮-烯醇互变异构平衡的首例。

ESR and ENDOR studies were accomplished on the free radical obtained from the oxidation of tri(2-deoxy-2-L-ascorbyl)amine in pH8.95 buffer solution.It is concluded that a keto-enol tautomeric equilibrium of the amine radical anion existed in the solution,which is believed to be the first example of keto-enol tauto-merism concerning a stable free radical.