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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