Tris(triphenylphosphine)ruthenium(II) dichloride is a versatile organometallic complex used as a catalyst in homogeneous catalysis. It is particularly employed in hydrogenation reactions, including the reduction of alkenes, alkynes, and dienes, as well as transfer hydrogenation of ketones and aldehydes under mild conditions. The compound also facilitates olefin isomerization and serves as a precursor for other ruthenium-based catalysts. Its phosphine ligands stabilize the ruthenium center, enhancing catalytic activity and selectivity. Widely applied in organic synthesis, pharmaceutical research, and fine chemicals production for efficient and selective transformations.