Cleavage of a Bicyclo[2.2.1]hepta-2,5-dienyl Ligand During Transfer From Nickel to Ruthenium. X-Ray Structure of Ru₂{μ-η¹,O:η²-C(CO₂Me)=CHC(O) Ome }(CO)₄Cp

Abstract

The reaction between Ru₃(CO)₁₂ and Ni{η¹,η²-C₅H₅C₂(CO₂Me)₂}Cp afforded orange Ru₂{μ-η¹,O:η²-C(CO₂Me)=CHC(O) Ome }(CO)₄Cp(43%) as the only isolable complex. An X-ray structure determination showed that a C(CO₂Me)=CHC(O) OMe ligand bridges an Ru-Ru bond [2.7744(9) Ǻ] via a μ-η¹:η²-vinyl interaction and by coordination of one of the ester CO groups [ Ru -O 2.148(2) Ǻ]. One ruthenium atom bears three terminal CO ligands and the other ruthenium atom has one CO ligand and an η5-C₅H₅ group. In the reaction, transfer of Cp and the vinyl group (from the bicyclo [2.2.1]hepta-2,5-dienyl ligand originally present) from nickel to ruthenium has occurred.