Immobilization of an Iridium(I)-NHC-Phosphine Catalyst for Hydrogenation Reactions under Batch and Flow Conditions

Na2[Ir(cod)(emim)(mtppts)] (1) with high catalytic activity in various organic- and aqueous-phase hydrogenation reactions was immobilized on several types of commercially available ion-exchange supports. The resulting heterogeneous catalyst investigated batch an H-Cube flow reactor the phenylacetylene, diphenylacetylene, 1-hexyne, benzylideneacetone. Under proper conditions, highly selective alkynes to alkenes, demonstrated excellent selectivity C=C over C=O hydrogenation; furthermore, it displayed remarkable stability. Activity 1 levulinic acid γ-valerolactone also assessed.