11,12-dihydrodibenzo[c,g][1,2]diazocine (Diazocine, 12), a molecular switch capable of reversible interconversion between (at least) two states by light, has been widely used in pharmacology and biochemistry. However, most of the synthetic methods so far have been limited by tedious steps, complicated derivatives, and long reaction times, resulting in poor synthetic yields of 12. Here, we propose a green, effective, and controllable strategy for synthesizing 12. The intramolecular cyclization (8-membered ring) of 2,2′-dinitrodibenzyl (1) was achieved by electrochemical reduction in the presence of CO₂, and 12 and its derivatives 11,12-dihydrodibenzo[c,g][1,2]diazocine-N-oxide (DDCG-N, 11) were synthesized. The electrochemical reduction mechanism of 1 in the presence of CO₂ was investigated by cyclic voltammetry (CV) and in situ FT-IR spectroelectrochemistry. The molecular structures of the electrolytic product (12) and intermediate (11) were confirmed by single-crystal X-ray diffraction, NMR, and MS. The results show that the electrochemical behavior of 1 in acetonitrile (AN) changes from a reversible two-step 1-electron transfer process (in the absence of CO₂) to an irreversible 8-electron transfer process (in the presence of CO₂). The 12 and 11 can be obtained by controlling the electrolytic potential and time. Under the optimum conditions, the yields of 12 and 11 were 84% and 71%, respectively.

11,12-二氢二苯并[c,g][1,2]重氮辛（Diazocine，12）是一种能够通过光在（至少）两种状态之间可逆相互转换的分子开关，已广泛应用于药理学和生物化学。然而，迄今为止大多数合成方法都受到步骤繁琐、衍生物复杂、反应时间长的限制，导致12的合成收率较差。在此，我们提出了一种绿色、有效、可控的12合成策略。在 CO ₂存在下通过电化学还原实现 2,2'-二硝基二苄基 (1) 的环化（8 元环），12 及其衍生物 11,12-二氢二苯并[c,g][1,2]diazocine合成了-N-氧化物(DDCG-N，11 ) 。CO存在下1的电化学还原机理通过循环伏安法 (CV) 和原位 FT-IR 光谱电化学对_{图 2进行了研究。}通过单晶X射线衍射、NMR、MS确认了电解产物(12)和中间体(11)的分子结构。结果表明，1在乙腈（AN）中的电化学行为从可逆的两步1电子转移过程（不存在CO 2 _）转变为不可逆的8电子转移过程（存在CO ₂） 。通过控制电解电位和时间可以得到12和11。在最佳条件下，12和11的收率分别为84%和71%。