Regioselective hydrothiolation of terminal acetylene catalyzed by magnetite (Fe<sub>3</sub>O<sub>4</sub>) nanoparticles

<p>Herein, we report a new and solvent-free methodology for the preparation of vinyl thioethers from terminal alkynes and thiols, using magnetite (Fe<sub>3</sub>O<sub>4</sub>) nanoparticles as a recyclable catalyst. With this greener method, the desired vinyl thioethers were achieved in good yields and with good stereoselectivity. In addition, the catalyst was easily recovered using a simple external magnet and reused for further catalytic reactions without significant loss of activity up to the fifth cycle.</p>