Abstract Carbon is demonstrated as a mild and transition metal free catalyst for the preparation of N-rich heterocyclic compounds for the first time. The surface > C=O groups on nanodiamonds were identified as an active site, which most probably generates imidogene as a reactive species that triggers the reaction. The experimental results supported with density functional theory calculations were used to reveal a new reaction pathway, different from the conventional homogeneous one that indicates involvement of nitrogen radicals in the reaction.

中文翻译：

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以前所未有的机制碳催化制备富含 N 的杂环

摘要 碳首次被证明是一种温和且不含过渡金属的催化剂，用于制备富氮杂环化合物。纳米金刚石上的表面 > C=O 基团被确定为活性位点，最有可能产生亚胺基作为触发反应的反应性物质。用密度泛函理论计算支持的实验结果揭示了一种新的反应途径，不同于传统的均相反应途径，表明氮自由基参与反应。