Abstract
Under mild microwave irradiation conditions a variety of symmetrical and unsymmetrical N,N′-disubstituted thioureas and ureas were prepared via the reaction of N-monosubstituted hydroxylamines with isocyanate and isothiocyanate derivatives over MgO under solvent-free conditions. This new method afforded satisfactory results with good yields, short reaction time, and simplicity in the experimental procedure.
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