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Piezoelectric-Driven Mechanochemical Halogenation: A Transformative Pathway for Sustainable Sandmeyer Reactions via
Pan Gao1, Xiangchuan Xiu1, Zijia Han2
1College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
None:
The Sandmeyer reaction is a key method for synthesizing aryl halides but often requires complex procedures and large solvent volumes. This study introduces a mechanoredox system using ball milling to activate piezoelectric BaTiO3, enabling solvent-minimized, metal-catalyst-free halogenation of aryl diazonium salts under air. The method features a broad substrate scope, scalability, and recyclable piezoelectric materials without significant activity loss. This sustainable approach overcomes the limitations of traditional Sandmeyer reactions, providing an efficient and practical alternative for aryl halide synthesis.
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