The dianions formed by the electroreduction of Z-O₂NC₆H₄CHCHC₆H₄NO₂, E-O₂NC₆H₄CHCHC₆H₄NO₂, O₂NC₆H₄CH₂–CH₂C₆H₄NO₂ or O₂NC₆H₄CMeH–CMeHC₆H₄NO₂, as well as the anion radical arising from 4-nitrotoluene, are stable, in the time scale of cyclic voltammetry (DMF + 0.10 M NBu₄BF₄). However, in the electrolysis time scale (from minutes to hours), only the dianion O₂NC₆H₄CMeH–CMeHC₆H₄NO₂²⁻ remains stable, since the reduced species, Z-O₂NC₆H₄CHCHC₆H₄NO₂²⁻, O₂NC₆H₄CH₂–CH₂C₆H₄NO₂²⁻ or O₂NC₆H₄Me˙⁻, evolve to form the E-O₂NC₆H₄CHCHC₆H₄NO₂²⁻ dianion. This intermediate is recovered as the neutral species E-O₂NC₆H₄CHCHC₆H₄NO₂ with concomitant water reduction after the work-up with water, as demonstrated by combined electrolysis, cyclic voltammetry experiments, UV-spectroelectrochochemistry and theoretical calculations. Bulk electrolysis under optimized conditions (ACN + 0.10 M NBu₄BF₄) provides 40% and 67% isolated yields of E-4,4′-dinitrostilbene from 4-nitrotoluene and 4,4′-dinitrobibenzyl, respectively.

中文翻译：

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从4-硝基甲苯和4,4'-二硝基联苄到E -4,4'-二硝基苯乙烯：电化学方法

通过Z -O ₂ NC ₆ H ₄ CH CHC ₆ H ₄ NO ₂，E -O ₂ NC ₆ H ₄ CH CHC ₆ H ₄ NO ₂，O ₂ NC ₆ H ₄ CH ₂ -CH ₂的电还原形成的阴离子。C ₆ H ₄ NO ₂或O ₂ NC ₆ H ₄ CMeH–CMeHC ₆ H在循环伏安法（DMF + 0.10 M NBu ₄ BF ₄）的时间范围内， ₄ NO ₂以及由4-硝基甲苯产生的阴离子自由基是稳定的。但是，在电解时间范围内（从几分钟到几小时），只有二价阴离子O ₂ NC ₆ H ₄ CMeH–CMeHC ₆ H ₄ NO ₂ ^2-保持稳定，因为还原的物质Z -O ₂ NC ₆ H ₄ CHCHC ₆ H ₄ NO ₂ ^2-，O ₂ NC ₆ H₄ CH ₂ -CH ₂ C ^ ₆ ħ ₄ NO ₂ ^2-或O的₂ NC ₆ H ^ ₄ ME ^- ，进化以形成ë -O ₂ NC ₆ H ^ ₄ CHCHC ₆ H ^ ₄ NO ₂ ^2-的二价阴离子。该中间体被回收为中性物质E -O ₂ NC ₆ H ₄ CHCHC ₆ H ₄ NO ₂加水后伴随的水减少，如通过组合电解，循环伏安法实验，UV光谱电化学法和理论计算所证明的。在最佳条件下（ACN + 0.10 M NBu ₄ BF ₄）进行本体电解可分别从4-硝基甲苯和4,4'-二硝基联苄中分离出40％和67％的E -4,4'-二硝基sti。