Sulfuros clúster de molibdeno como catalizadores selectivos en procesos de reducción para la síntesis de aminas

Abstract

This PhD Thesis describes the synthesis, characterization and catalytic applications of new molybdenum sulphide clusters bearing nitrogen-donor ligands. The synthesis of the first diamino Mo3S4 cluster of formula [Mo3S4Cl3(dmen)3]+ (dmen = N,N'-dimethylethyilenediamine) is presented and its activity in the reduction of nitro and azoarenes to produce anilines using silanes as reducing agents is demonstrated. Next, the complexes [Mo3S4Cl3(dmen)3]+ and [Mo3S4Cl3(dnbpy)3]+ (dnbpy = 4,4'-dinonyl-2,2'-bipyridyl) are tested in the reduction of nitroarenes with molecular hydrogen, which is known to be the most environmentally benign reducing agent. The diamino cluster is also used in the tandem reductive amination of aldehydes from nitroarenes to obtain secondary amines. Finally, the heterobimetallic cluster [Mo3(Pt(PPh3))S4Cl3(dmen)3]+ is evaluated for the preparation of tertiary amines through the direct methylation of nitroarenes using formic acid as a renewable C1 source and silanes as reducing agents.