Hydrogenation of nitriles is an efficient and environmentally friendly route to synthesize symmetrical secondary amines, but it usually produces a mixture of amines, imines, and hydrogenolysis by‐products. Herein we report a magnetic quaternary‐component Pt−CuFe/Fe₃O₄ nanocatalyst system for the selective synthesis of symmetrical secondary amines with ammonia borane as hydrogen donor. The catalyst with a low Pt loading (0.456 wt%) is the source of the activity, and the d‐band electron transfer from Cu to Fe enhances the selectivity. This synergistic effect results in the transformation of benzonitrile to dibenzylamine with excellent conversion (up to 99 %) and nearly quantitative selectivity (up to 96 %) under mild reaction conditions, nevertheless, the reaction TOF is as high as up to 1409.9 h⁻¹. A variety of nitriles are suitable for the synthesis of symmetrical secondary amines. More importantly, unwanted hydrogenolysis byproducts, especially toluene, is not detected at all. In addition, the catalyst is magnetically recoverable, and it can be reused up to five times.

中文翻译：

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使用Pt-CuFe / Fe3 O4催化剂和氨硼烷作为氢供体，从腈选择性合成对称仲胺。

腈加氢是合成对称仲胺的一种有效且环保的途径，但通常会产生胺，亚胺和氢解副产物的混合物。在这里，我们报告了一种磁性四元组分Pt-CuFe / Fe ₃ O ₄氨硼烷作为氢供体选择性合成对称仲胺的纳米催化剂体系。Pt含量低（0.456 wt％）的催化剂是活性的来源，并且d-带电子从Cu转移到Fe会提高选择性。这种协同作用导致在温和的反应条件下，苯甲腈以优异的转化率（高达99％）和几乎定量的选择性（高达96％）转化为二苄基胺，但是反应TOF高达1409.9 h ^-1。多种腈适合用于合成对称仲胺。更重要的是，根本没有检测到有害的氢解副产物，特别是甲苯。另外，该催化剂是可磁回收的，并且可以重复使用多达五次。