Mechanism of the Solution-Phase Reaction of Alkyl Sulfides with Atomic Hydrogen. Reduction via a 9-S-3 Radical Intermediate
作者:Dennis D. Tanner、Sudha Koppula、Pramod Kandanarachchi
DOI:10.1021/jo9615615
日期:1997.6.1
alkyl sulfide fragmentation subsequent to its reaction with atomic hydrogen is indicative of a reaction that proceeds via an early transition state. The competitive reduction of a series of substituted-benzyl alkyl sulfides was insensitive to the substituent on the aromatic ring (rho = -0.13, r = 0.99). The relative rates of fragmentation of a series of the substituted-benzyl alkyl sulfides gave a
在与原子氢反应后,苄基烷基硫醚片段化的低选择性表明该反应是通过早期过渡态进行的。一系列取代的苄基烷基硫醚的竞争性还原对芳环上的取代基不敏感(rho = -0.13,r = 0.99)。一系列取代的苄基烷基硫化物的相对裂解率给出了V形的Hammett图。给电子基团和吸电子基团都使过渡态不稳定(rho = + 0.99,r = 0.999; rho = -0.82,r = 0.992)。由于烷基苄基硫醚的相对消失率不依赖于取代基,而断裂的相对率则不依赖,因此优选9-S-3中间体作为产生产物的结构。