Disubstituted or sterically hindered hydroxylamines react with bulky S-thioacyl dithiophosphates yielding O-thioacylhydroxylamines. The reaction of O-thioacylhydroxylamines with dithiophosphoric acids yields acyl thiophosphoryl disulfides and ammonium dithiophosphates. The influence of radical traps on the reaction yield strongly suggests that radicals are involved in the mechanism of the process. The low redox potential of dithiophosphates, the observed photochemical stability of O-thioacylhydroxylamines and the influence of light on acyl thiophosphoryl disulfides yield imply involvement of a single electron transfer process in the investigated reaction.
二取代的或受立体阻碍的
羟胺与大体积的 S-
硫代酰基
二硫代磷酸反应生成 O-
硫代酰基
羟胺。O-
硫代酰
羟胺与
二硫代磷酸反应生成酰基
硫代
磷酰二
硫化物和
二硫代磷酸铵。自由基陷阱对反应产率的影响强烈表明,自由基参与了这一过程的机理。
二硫代磷酸铵的氧化还原电位较低、O-
硫代酰
羟胺的光
化学稳定性以及光对酰基
硫代磷酸二
硫化物产率的影响,都意味着所研究的反应涉及单电子转移过程。