本工作用异辛烷作为模型碳氢化合物,以氮氧游离基TEMPO和它的烷基羟氨醚作为阻化剂,来进行其光氧化的顺磁共振(ESR)研究。结果提供了有导致氮氧游离基再生的黑暗反应存在的证据。这种反应的特性支持了这样的推论,即Denisov循环不是HALS的稳定作用的主要机理,而是有利于形成不稳定的中间产物,其中可能有羟基胺 In this work, isooctane was used as a model hydrocarbon and its photooxidation paramagnetic resonance (ESR) study was performed using nitroxide radical TEMPO and its alkylhydroxylamine as a retarding agent. The results provide evidence of the existence of dark reactions that lead to the regeneration of nitroxide radicals. The nature of this reaction supports the corollary of the fact that the Denisov cycle is not the main mechanism of the stabilizing effect of HALS but rather favors the formation of unstable intermediates in which hydroxylamine