Affiliation:
1. Department of Chemistry University of Louisville 2320 S. Brook Street Louisville KY 40292 USA
2. Conn Center for Renewable Energy Research University of Louisville Louisville KY 40292 USA
3. Chemical & Analytical Development Novartis Pharma AG 4056 Basel Switzerland
4. Department of Chemistry University of Missouri 601 S College Ave # 125 Columbia MO 65211 USA
Abstract
AbstractHerein, we developed the recyclable ligand‐free iridium (Ir)‐hydride based Ir0 nanoparticles (NPs) for the first regioselective partial hydrogenation of PV‐substituted naphthalenes. Both the isolated and in situ generated NPs are catalytically active. A control nuclear magnetic resonance (NMR) study revealed the presence of metal‐surface‐bound hydrides, most likely formed from Ir0 species. A control NMR study confirmed that hexafluoroisopropanol as a solvent was accountable for substrate activation via hydrogen bonding. High‐resolution transmission electron microscopy of the catalyst supports the formation of ultrasmall NPs, and X‐ray photoelectron spectroscopy confirmed the dominance of Ir0 in the NPs. The catalytic activity of NPs is broad as showcased by highly regioselective aromatic ring reduction in various phosphine oxides or phosphonates. The study also showcased a novel pathway toward preparing bis(diphenylphosphino)‐5,5′,6,6′,7,7′,8,8′‐octahydro‐1,1′‐binaphthyl (H8‐BINAP) and its derivatives without losing enantioselectivity during catalytic events.
Funder
National Science Foundation