Ruthenium metal alkylidene complexes coordinated with triazolylidene ligands that exhibit high olefin metathesis activity

摘要

The invention discloses ruthenium alkylidene complexes of the type (PCy₃)(L)Cl₂Ru(CHPh), where L is a triazolylidene ligand of the general formula: ;These catalysts have been found to be considerably more active for olefin metathesis at elevated temperatures than the parent catalyst (PCy₃)₂Cl₂Ru(CHPh)(2). For example, complex 14 (L=1,3,4-triphenyl-4.5-dihydro-1H-triazol-5-ylidene) is able to catalyze the ring-closing metathesis of substituted dienes to give tetra-substituted cyclic olefins in good yield. In addition, this complex demonstrates the analogous stability towards oxygen and moisture exhibited by ruthenium alkylidene 2.