Novel homogeneous Salen Mn(III) catalysts synthesized from dialdehyde or diketone with o-aminophenol for catalyzing epoxidation of alkenes

作者：Xiong, Donglu; Fu, Zaihui^*; Zhong, Sheng; Jiang, Xiangfen; Yin, Dulin

来源：Catalysis Letters, 2007, 113(3-4): 155-159.

DOI：10.1007/s10562-007-9018-8

• novel Salen(III) Mn complexes
• dialdehyde
• diketone
• o-aminophenol
• epoxidation of alkenes
• molecular oxygen/isobutyaldehyde

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) center dot 2H(2)O center dot 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.

• 出版日期2007-2
• 单位湖南师范大学