An efficient aerobic oxidation for p-xylene to p-toluic acid by unsymmetrical Schiff base manganese(III) complexes with pendant benzo-10-aza-crown ether or morpholino-groups

作者：Li, Jian-Zhang^*; Yang, Zhu-Zhu; He, Xi-Yang; Zeng, Jun; Qin, Sheng-Ying

来源：Journal of Chemical Research, 2010, 34(10): 581-584.

DOI：10.3184/030823410X12867297532755

• benzo-10-aza-15-crown-5
• unsymmetrical salicylaldimine bis-Schiff base
• aerobic oxidation
• Schiff base manganese(III) complexes
• oxidation of p-xylene

Unsymmetrical Schiff base Mn(III) complexes with pendant aza-crown or morpholino groups have been synthesised and studied as catalysts in aerobic oxidation of p-xylene to p-toluic acid (PTA). The oxidation of p-xylene to p-toluic acid with air at 120 degrees C under normal atmospheric pressure occurred efficiently in the presence of aza-crown ether substituted unsymmetrical Schiff base Mn(III) complexes. Significant selectivity (up to similar to 90%) and conversion levels (up to similar to 40%) were obtained. The effect of the pendant aza-crown ether group in Mn(III) Schiff base complexes on the oxidation of p-xylene was also investigated by comparison with the pendant morpholino-group analogues. The addition of Na+ cation accelerated the rate of conversion of p-xylene to p-toluic acid.

• 出版日期2010-10
• 单位四川大学; 四川轻化工大学