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Olefins oxidation with molecular O 2 in the presence of chiral Mn (III) salen complex supported on magnetic CoFe 2 O 4 @SiO 2 @CPTMS
Author(s) -
Hemmat Kaveh,
Nasseri Mohammad A.,
Allahresani Ali
Publication year - 2019
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.4937
Subject(s) - chemistry , thermogravimetric analysis , nanocomposite , catalysis , selectivity , transmission electron microscopy , scanning electron microscope , fourier transform infrared spectroscopy , heterogeneous catalysis , infrared spectroscopy , covalent bond , nuclear chemistry , crystallography , chemical engineering , organic chemistry , materials science , nanotechnology , composite material , engineering
In the present study, CoFe 2 O 4 @SiO 2 @CPTMS nanocomposite was synthesized and the homogeneous chiral Mn‐salen complex was anchored covalently onto the surface of CoFe 2 O 4 @SiO 2 @CPTMS nanocomposite. The heterogeneous Mn‐salen magnetic nanocatalyst (CoFe 2 O 4 @SiO 2 @CPTMS@ chiral Mn (III) Complex) was characterized by different techniques including transmission electron microscopy (TEM), Fourier transform infrared (FT‐IR), vibrating sample magnetometer (VSM), scanning electron microscopy (SEM), powder X‐ray diffraction (XRD) and thermogravimetric analysis (TGA). Then, the aerobic enantioselective oxidation of olefins to the corresponding epoxide was investigated in the presence of magnetic chiral CoFe 2 O 4 @SiO 2 @Mn (III) complex at ambient conditions within 90 min. The results showed the corresponding products were synthesized with excellent yields and selectivity. In addition, the heterogeneous CoFe 2 O 4 @SiO 2 @ CPTMS@ chiral Mn (III) complex has benefits such as high selectivity and comparable catalytic reactivity with its homogeneous analog as well as mild reaction condition, facile recovery, and recycling of the heterogeneous catalyst.