Electroorganic reactions. Part 56: Anodic oxidation of 2-methyl- and 2-benzylnaphthalenes: factors influencing competing pathways
作者:James H.P Utley、Gregor G Rozenberg
DOI:10.1016/s0040-4020(02)00495-7
日期:2002.6
carbon. However, little side-chain anodic oxidation is observed under any conditions tried; the radical–cations of electron-rich substrates preferentially dimerise and a strongly electron-withdrawing substituent at the 6-position (EtOSO2) promotes nuclear substitution. In contrast, oxidation with DDQ in aqueous acetic acid gives efficient side-chain oxidation for electron rich substrates, consistent
系统地研究了在萘核的6位和苄基侧链的4-苯基位取代的2-甲基和2-苄基萘在亲核介质中的阳极氧化作用,以确定有利于环境的因素侧链取代。循环伏安法证实6-取代对萘核的氧化电位有深远的影响,13 C化学位移表明在苄基碳上有极性作用。然而,在任何尝试的条件下,几乎都没有观察到侧链阳极氧化。富电子底物的自由基阳离子优先二聚,并且在6位上具有强吸电子取代基(EtOSO 2)促进核替代。相反,在含水乙酸中用DDQ氧化可对富含电子的底物进行有效的侧链氧化,这与氢化物转移(可能在分子内通过电荷转移络合物)转移一致。