Construction of hybrid ionic liquid-catalysts for the highly effective conversion of H₂S by nitriles into thioamides

Described herein presents a kind of multisite hybrid ionic liquid-catalysts and establishes a novel strategy for H2S utilization, which has been characterized by multiaspects to reveal internal structural characterization. Through chemical modification, the D101-based hybrid ILs were used for the direct synthesis of thioamides from the addition of H2S and nitriles. D101-[PMDETA][DMG] can achieve an impressive activity of quantitative conversion for benzonitrile. Reaction kinetics, adsorption thermodynamics, substrate universality, and catalyst cycling experiments have been systematically studied. A first-order kinetic model was constructed and studied experimentally for the reaction of nitriles with H2S to produce thioamides. The internal mechanism was proposed through experiments and confirmed by DFT-based theoretical calculations. Moreover, D101-based hybrid ILs can be easily recovered, thus completing the cyclic process of thioamide multiplication. This work not only offers an effective method for the construction of organic-inorganic hybrid materials but also provides a novel insight into efficient H2S conversion.