NHC-boranes are robust Lewis pairs and powerful hydride and hydrogen atom donors.1 Comparatively, their coordination chemistry is quasi-unknown since only a single report described it in 2010.2 This feature might be explained by the instability of such construction. Aiming at studying the coordination chemistry of NHC-borane with transition metal complexes, we targeted NHC-borane structures featuring two-electron donor ligands to serve as anchor of coordination. Using a known diphosphine carbene platform, we prepared NHC-borane species featuring two pendant phosphine moieties in order to target bimetallic structures. Homogeneous multi-metallic systems are indeed powerful materials to achieve cooperative effects otherwise unreachable by their mono-metallic counterparts, as exemplified by heterogeneous surfaces and metallo-enzymes.3 The synthesis and characterization of these original organoboron compounds and their coordination toward various TM precursors will be presented.

Synthesis and coordination of diphosphine-NHC-borane compounds

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ACS Fall 2022

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