Synthesis and Study of Mono-Schiff Base Mn III Complexes with Aza-crown or Morpholino Pendant as Catalyst in Aerobic Oxidation of p -xylene to p -toluic Acid

Author: Yan Jie   Li Jian-zhang   Li Ke-bin   Zhou Bo   Zeng Wei   Qin Sheng-ying  

Publisher: Springer Publishing Company

ISSN: 0340-4285

Source: Transition Metal Chemistry, Vol.31, Iss.3, 2006-04, pp. : 286-292

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Abstract

Novel mono-Schiff base MnIII complexes with pendant aza-crown or morpholino groups have been synthesized and studied as catalysts in aerobic oxidation of p-xylene to p-toluic acid. The oxidation of p-xylene to p-toluic acid with air at 120 °C under normal atmospheric pressure occured efficiently in the presence of aza-crown ether substituted mono-Schiff base MnIII complexes. Significant selectivity (up to ~90%) and conversion levels (up to ~38%) were obtained. The effect of the aza-crown ether pendant in MnIII Schiff base complexes on the oxidation of p-xylene was also investigated by comparison with the morpholino pendant analogues. The addition of alkali metal ions accelerated the rate of conversion of p-xylene to p-toluic acid.

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