Synthesis of σ-aryl compounds of molybdenum, rhenium, ruthenium, and rhodium from the metal–metal bonded binuclear acetates of molybdenum(II), rhenium(III), ruthenium(II,III), and rhodium(II)

Abstract

The interaction between diarylmagnesiums, MgAr₂(Ar = C₆H₅, 2-MeOC₆H₄ and 4-FC₆H₄) and the metal–metal bonded binuclear bridged tetra-acetates, M^II₂(CO₂Me)₄, (M = Mo and Rh) and Ru^II,III(CO₂Me)₄Cl in the presence of trimethylphosphine produces monomeric (Ru, Rh) or dimeric (Mo) aryls; for Ru and the 2-methoxyphenyl, hydrogen loss from the MeO group leads to formation of a metallocycle. In the absence of PMe₃, Re₂(O₂CMe)₄Cl₂ gives a dimeric binary aryl, Re₂(2-MeOC₆H₄)₆.

The compounds have been studied by ¹H, ³¹P, and ¹³C n.m.r. and i.r. spectroscopy. Likely structures are discussed.