Novel homogeneous Salen Mn(III) catalysts synthesized from dialdehyde or diketone with o -aminophenol for catalyzing epoxidation of alkenes
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- 作者：Donglu Xiong ; Zaihui Fu ; Sheng Zhong ; Xiangfen Jiang and Dulin Yin
- 关键词：novel Salen(III) Mn complexes ; dialdehyde ; diketone ; o ; aminophenol ; epoxidation of alkenes ; molecular oxygen/isobutyaldehyde
- 刊名：Catalysis Letters
- 出版年：2007
- 出版时间：February, 2007
- 年：2007
- 卷：113
- 期：3-4
- 页码：155-159
- 全文大小：306 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Catalysis
Physical Chemistry
Industrial Chemistry and Chemical Engineering
Pharmacy - 出版者：Springer Netherlands
- ISSN：1572-879X
文摘
A series of novel non-salicylaldehyde based Salen ligands have been synthesized from the condensation of dialdehyde or diketone with o-aminophenol and the corresponding manganese(III) complexes prepared by further coordination of them with Mn(OAc)2·2H2O{\hbox{Mn(OAc)}_{2}\cdot 2\hbox{H}_{2}\hbox{O}} . FT-IR, UV–Vis spectra, chemical analysis and the structure optimized by Hartree-Fork/3-21G+ all indicated that the qualities of these novel Mn complexes were relative to their molecular structures. More specifically, glyoxal based Mn complex 2c, which was similar to the traditional Mn(III)-salicylethylenediamine, had a short carbon chain and non geometrical constraint of the aliphatic bridge in the two o-aminophenol, and its quality was the best when compared to glutaraldehyde, 2,4-pentanedione and 1,3-cyclohexanedione based Salen Mn(III) complexes (3c, 4c and 5c). And it was also the excellent catalyst for the epoxidations of several non-functionalized alkenes with molecular oxygen/sacrificial-isobutyaldehyde, PhI(OAc)2 or H2O2 as oxidant.