2,2'-Carbonylbibenzimidazole Ligand-Based Hyper-Cross-Linked Polymer-Supported Iridium Complex: A Recyclable Metal-Polymer Ligand Bifunctional Catalyst for Upgrading Ethanol to n-Butanol.

-butanol in up to 37% yield. Mechanistic investigations and density functional theory calculations were further conducted to gain insights into the catalytic pathway. The catalyst could be reused for six consecutive runs without significant activity decay.