电化学还原合成1,5-二氨基萘

研究了以1,5-二硝基萘为原料电化学还原合成1,5-二氨基萘的反应. 室温下, 运用循环伏安法研究了1,5-二硝基萘的循环伏安行为, 1,5-二硝基萘的还原是一受扩散控制的不可逆反应; 循环伏安图上两个连续的还原峰对应于两个硝基的还原; 求出了反应的传递系数α₁在0.275～0.335之间, α₂在0.360～0.437之间. 探讨了电解电位(E)、底物浓度(c₁)、电解电量(Q)、硫酸浓度(c₂)以及溶剂(DMF)与水的体积比(Y)对产物产率的影响, 在最优条件下1,5-二氨基萘的产率最高可达77%.

Synthesis of 1,5-Diaminonaphthalene by Electrochemical Reduction

Electrosynthesis of 1,5-diaminonaphthalene from 1,5-dinitronaphthalene was studied. At room temperature, the electrochemical reduction behavior of 1,5-dinitronaphathlene has been studied on a Cu electrode by cycle voltammertry in DMF-water solution. It was an irreversible reaction controlled by diffusion. 1,5-Dinitronaphthalene exhibited two successive waves in the DMF-water solution which were corresponding to the two nitro-group electroreduction. The transfer coefficients of the reaction were calcu-lated. The values of α₁ and α₂ were between 0.275～0.335 and 0.360～0.437, respectively. Influence of electrolysis potential (E), the concentration of 1,5-dinitronaphthalene (c₁), the concentration of sulfuric acid (c₂), the passed charge (Q) and volume ratio of solvent to water (Y) was investigated to opti-mize the electrolytic conditions, with the maximal yield to be 77%.