A highly efficient oxidation of amines including primary and secondary amines into imines using O₂ as the oxidant was realized by cobalt tetra(2-hydroxymethyl-1,4-dithiin)porphyrazine (CoPz(hmdtn)₄) under irradiation of visible light (λ ≥ 420 nm). Particularly, the photocatalytic selective oxidation of benzylamine into N-benzylidenebenzylamine was thoroughly studied in order to get more insight into the reaction kinetics and mechanism for the oxidation of amine. The photocatalytic oxidation of benzylamine was observed to follow pseudo-first-order reaction kinetics. Moreover, a reasonable linear relationship between the log(k_X/k_H) values and the Brown-Okamoto constant (σ⁺) parameters was obtained for oxidation of para- and meta-substituted benzylamines. Besides imine, the presence of other intermediate products such as NH-imine and H₂O₂ was further evidenced in this photocatalytic system. Additionally, the reactive oxygen species (ROSs) generated in this photocatalytic process were confirmed by electron spin resonance (ESR) technique. The possible photocatalytic transformation pathway of amine into imine was also proposed, involving the dehydrogenation of amine to form NH-imine and the nucleophilic addition of NH-imine by free amine to afford the final imine.

在可见光（λ）下，通过四（2-羟甲基-1,4-二硫辛）卟啉钴（CoPz（hmdtn）₄），使用O ₂作为氧化剂，将包括伯胺和仲胺在内的胺高效氧化为亚胺。 ≥420 nm）。特别是，对苄胺光催化选择性氧化为N-亚苄基苄胺的方法进行了深入研究，以进一步了解胺氧化的反应动力学和机理。观察到苄胺的光催化氧化遵循伪一级反应动力学。此外，log（k _X / k _H）值和布朗-冈本常数（σ ⁺）参数用于对位和间位取代的苄胺的氧化。除了亚胺以外，在该光催化体系中还进一步证明了其他中间产物的存在，例如NH-亚胺和H ₂ O ₂。此外，通过电子自旋共振（ESR）技术确认了在该光催化过程中产生的活性氧（ROSs）。还提出了胺向亚胺的可能的光催化转化途径，包括胺脱氢以形成NH-亚胺和由游离胺亲核加成NH-亚胺以得到最终的亚胺。