the p-phenyl position dramatically slows down the oxygenation of isobenzofuranyl radicals. However, both unsubstituted and m-substituted phenyl rings have no appreciable influence on the reactivity toward oxygen. Spin delocalization on the nitro group is proposed to explain the stability of the carbon-centered radical generated. [reaction: see text]
在对-苯基位置上存在硝基极大地减慢了
异苯并呋喃基自由基的氧化。但是,未取代的和间取代的苯环都没有对氧的反应性产生明显的影响。建议在硝基上进行自旋离域,以解释所产生的以碳为中心的自由基的稳定性。[反应:看文字]