A Versatile Precursor for the Synthesis of New Ruthenium Olefin Metathesis Catalysts

摘要

The ruthenium complex (IMesH_2)(Cl)_2(C_5H_5N)_2Ru═CHPh [IMesH_2 = 1,3-dimesityl-4,5-dihydroimidazol-2-ylidene] (3) was prepared by the reaction of (IMesH_2)(PCy_3)(Cl)_2Ru═CHPh (2) with an excess of pyridine. Complex 3 contains substitutionally labile pyridine and chloride ligands and serves as a versatile starting material for the synthesis of new ruthenium benzylidenes.