Evidence Against a Hydrogen Abstraction Mechanism in the Photorearrangement of Azoxybenzene to 2-Hydroxyazobenzene
作者:David J. W. Goon、N. G. Murray、Jean-Pierre Schoch、N. J. Bunce
DOI:10.1139/v73-573
日期:1973.12.1
In an attempt to distinguish between ionic and free radical mechanisms for the photorearrangement of azoxybenzene to 2-hydroxyazobenzene, aromatic azoxycompounds carrying C—H functions ortho to the azoxy linkage have been prepared and irradiated. The failure of these weaker C—H bonds to divert the reaction from its normal course argues against a hydrogen abstraction–hydroxyl transfer mechanism. This
为了区分用于将偶氮苯光重排成 2-羟基偶氮苯的离子和自由基机制,已制备并辐照在偶氮键邻位带有 CH 官能团的芳族偶氮化合物。这些较弱的 C-H 键未能将反应从其正常过程中转移,这与夺氢 - 羟基转移机制相悖。观察到从非极性溶剂变为极性溶剂时 2-羟基偶氮苯形成的量子产率增加了 30 倍,并且动力学氘同位素效应对所需的初级同位素效应来说太小了,从而支持了这一结论通过抽象机制。得出的结论是,迄今为止的实验观察可能最容易适应最初由獾和巴特利提出的路线,