Complex sentence: Treatment of ((cymene) RuCl 2) 2 with the chelating anionic ligand precursor TsDPENH gives (cymene) Ru (TsDPEN-H), a catalyst for asymmetric transfer hydrogenation.
Split into simpler sentences: Treatment of ((cymene) RuCl 2) 2 with the chelating ligand TsDPENH. The product (cymene) Ru (TsDPEN-H) is a catalyst for asymmetric transfer hydrogenation.