Used as a precursor in the synthesis of N-heterocyclic carbene (NHC) ligands, this compound plays a key role in organometallic chemistry and catalysis. Its bulky mesityl group stabilizes metal complexes, making it valuable in homogeneous catalysts for cross-coupling reactions, olefin metathesis, and CO2 reduction. The rigid fused-ring structure enhances electronic and steric control in catalytic cycles. It is also employed in the development of novel ionic liquids and functional materials due to its thermal stability and tunable solubility.