Kinetics and Mechanism of CO Substitution of M2(CO)10 (M=Mn, Re) with an Entering Ligand (PPh3 or Py) in the Presence of an O-Atom Transfer Reagent (Me3NO or (CH3OC6H4)2TeO)

Abstract

Detailed kinetic data are reported for the CO substitution of M2(CO)10 (M-Mn, Re) with PPh3 or Py in the presence of Me3NO or (CH3OC6H4) TeO as an O atom transfer reagent in CHCl3 solvent. The rate of reactions are first order in concentrations of M (CO)10 and of oxides but zero order in entering ligand concentrations. The reactions of M2(CO)10 with N-oxide are faster than for the corresponding reactions with Te oxide. Although the compound Mn2(CO)10 reacts at about the same rate as does Re2(CO)10 in the presence of N-oxide, the manganese compound reacts 28 times faster than does the rhenium compound in the presence of Te-oxide. The results obtained are discussed in terms of the presumed mechanism of reaction.