Oxidative carbonylation of benzene and toluene catalyzed by compounds of Pd or Rh in trifluoroacertic acid and its anhydride in the presence of Cu, Fe, V, or Mo compounds, with oxygen as an oxidant

Abstract

Oxidative carbonylation of benzene and toluene catalyzed by Pd or Rh compounds in the presence of Cu, Fe, V, or Mo compounds in a mixture of trifluoroacetic acid and its anhydride at 125-150°C and partial pressures of carbon monoxide of 0.6-4.7 MPa and oxygen of 0.2-0.8 MPa leads to the corresponding aromatic acids with the yields of up to ca. 50% and 1800 mol per g-atom of the platinum group metal which is tens times higher than that achievable in the absence of oxygen. With the use of IR spectroscopy in situ it was shown that an acyl complex of Pd is formed, and the possibility of determination of the oxidation state of the cation of Cu in the course of oxidative carbonylation was demonstrated.