Double N,B-Type Bidentate Boryl Ligands Enabling a Highly Active Iridium Catalyst for C–H Borylation

Boryl ligands hold promise in catalysis due to their very high electron-donating property. In this communication double N,B-type boryl anions were designed as bidentate ligands to promote an sp2 C–H borylation reaction. A symmetric pyridine-containing tetraamino­diborane(4) compound (1) was readily prepared as the ligand precursor that could be used, in combination with [Ir­(OMe)­(COD)]2, to in situ generate a highly active catalyst for a broad range of (hetero)­arene substrates including highly electron-rich and/or sterically hindered ones. This work provides the first example of a bidentate boryl ligand in supporting homogeneous organometallic catalysis.