Used as a highly active metathesis catalyst in organic synthesis, particularly in ring-closing metathesis (RCM) and cross-metathesis (CM) reactions. It enables the formation of carbon-carbon double bonds with excellent selectivity and functional group tolerance. Commonly applied in the synthesis of complex molecules such as pharmaceuticals, natural products, and advanced materials. Exhibits superior stability and reactivity compared to earlier generation catalysts, especially in sterically hindered and electron-deficient substrates. Often employed in low catalytic loadings under inert atmosphere conditions.