The mechanism of selenium dioxide-hydrogen peroxide oxidation of saturated steroidal-3-ketones was investigated with the use of 2,2,4,4-D4-17β-hydroxy-5α-androstane-3-one. It was proven that formation of lactones II and III proceeds through a process analogous to Baeyer-Villiger oxidation. Formation of ring contracted acid (IV) was subject to a primary isotope effect with considerable C-D bond breakage
饱和甾-3-酮的
二氧化硒-
过氧化氢的氧化的机理与使用2,2,4,4- d的考察4 -17β羟基5α -
雄甾烷-3-酮。业已证明,内酯II和III的形成是通过类似于Baeyer-Villiger氧化的过程进行的。在速率测定步骤中,形成环缩合酸(Ⅳ)的过程具有主要的同位素效应,即相当大的C-D键断裂。由此推断,IV是通过酮的烯醇化而产生的。A环收缩的酸基本上保留了三个D原子,因此不包括平衡。