Synthesis and catalytic performance of mono-Schiff base manganese(III) complexes with aza-crown or morpholino pendants |
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| Authors: | Jian-zhang Li Xi-yang He Jun Zeng Zheng-hua Xiao Sheng-ying Qin |
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| Affiliation: | (1) Key Laboratory of Green Catalysis of Higher Education Institutes of Sichuan, Department of Chemistry, Sichuan University of Science and Engineering, Zigong, Sichuan, 643000, People’s Republic of China;(2) Department of Chemistry, Sichuan University, Chengdu, Sichuan, 610064, People’s Republic of China |
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| Abstract: | Abstract Mono-Schiff base Mn(III) complexes of general formula MnL2Cl, with pendant aza-crown or morpholino substituents, have been synthesized and investigated as catalysts for the epoxidation of styrene at ambient temperature and pressure. The highest conversion yield of styrene and selectivity for epoxide were 40 and 96%, respectively. These complexes have been also studied as catalysts for the aerobic oxidation of p-xylene to p-toluic acid. The effects of the crown ether group on the catalytic properties of the complexes are discussed. The oxidation of p-xylene to p-toluic acid with air at 120 °C under normal pressure proceeded efficiently in the presence of the aza-crown ether substituted complexes. Significant selectivity for p-toluic acid (up to ~87%) and conversion of p-xylene (up to ~30%) were obtained. |
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