*Article* **Copper-Free Halodediazoniation of Arenediazonium Tetrafluoroborates in Deep Eutectic Solvents-like Mixtures**

**Giovanni Ghigo 1,\*, Matteo Bonomo 1,2,\* , Achille Antenucci 1,2 , Chiara Reviglio <sup>1</sup> and Stefano Dughera 1,\***


**Abstract:** Deep Eutectic Solvent (DES)-like mixtures, based on glycerol and different halide organic and inorganic salts, are successfully exploited as new media in copper-free halodediazoniation of arenediazonium salts. The reactions are carried out in absence of metal-based catalysts, at room temperature and in a short time. Pure target products are obtained without the need for chromatographic separation. The solvents are fully characterized, and a computational study is presented aiming to understand the reaction mechanism.

**Keywords:** Sandmeyer reactions; deep eutectic solvents; reaction mechanism
