Half‐Sandwich ( <i>p</i> ‐Cymene) Ru Complexes With Hydrazone Ligands: Synthesis and Catalytic Activity in the Dehydrogenation of Alcohols

Three derivatives of hydrazone‐based N, O‐chelated half‐sandwich ruthenium complexes were synthesized via a convenient synthetic route, yielding satisfactory results. In the context of mild reaction conditions, the prepared air‐stable ruthenium complexes give sheen to exhibit efficient catalytic properties in the process of dehydrogenation of aromatic primary alcohols, resulting in the formation of the corresponding carboxylic acids. This reaction has been demonstrated to yield high productivities in open vessels, exhibit a broad substrate scope, and demonstrate good tolerance toward sensitive functional groups. Such half‐sandwich ruthenium catalyst systems have been shown exceptional catalytic activity and stability, thus highlighting their potential for industrial application. Ruthenium complex Ru1 molecular structure was confirmed via single crystal X‐ray analysis.