Abstract A simple, facile and efficient method has been developed for the Friedel–Crafts benzoylation of arenes using magnetic γ -Fe 2 O 3 nanoparticles under solvent-free sonication. The γ -Fe 2 O 3 nanoparticles were used as an efficient and magnetically recoverable catalyst for the synthesis of aromatic ketones in good to excellent yields at room temperature under solvent-free. The reaction occurred with high regioselectivity under mild condition. The magnetic γ -Fe 2 O 3 nanoparticles are economically synthesized in large-scale, easily separated from the reaction mixture by an external magnet and able to be reused several times without significant loss of the catalytic performance, which make them easy application to industrial processes.

中文翻译：

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可磁恢复的γ-Fe 2 O 3 纳米粒子作为超声波辐照下Friedel-Crafts苯甲酰化反应的高活性催化剂

摘要 开发了一种简单、简便且有效的方法，用于在无溶剂超声处理下使用磁性 γ -Fe 2 O 3 纳米粒子对芳烃进行 Friedel-Crafts 苯甲酰化。γ-Fe 2 O 3 纳米颗粒被用作一种高效且磁性可回收的催化剂，用于在室温下无溶剂条件下以良好至极好的收率合成芳香酮。该反应在温和条件下以高区域选择性发生。磁性γ-Fe 2 O 3 纳米颗粒可经济地大规模合成，通过外部磁铁容易从反应混合物中分离出来，并且能够重复使用多次而不会显着降低催化性能，这使得它们易于应用于工业过程.