Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 359, Issue 3, Pages 476-484Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.201600848
Keywords
aqueous hydrogen peroxide; asymmetric epoxidation; bioinspired manganese complexes; graphene oxide; synergistically
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Funding
- National Natural Science Foundation of China [21473226, 21133011]
- Youth Innovation Promotion Association CAS [2015325]
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Bioinspired manganese complexes of N-4 ligands and graphene oxide (GO) synergistically catalyze the highly enantioselective epoxidation of olefins (up to 99% ee), which is a rare example with GO as a co-catalyst in asymmetric catalysis. GO as a new and key additive not only successfully functions in catalytic amounts, but also has a positive effect for improving the enantioselectivity of the asymmetric epoxidation compared with the traditional stoichiometric organic carboxylic acid method [e.g., chalcone, 95% ee (3.5 mg GO) vs. 84% ee (5 equiv., 75 mg acetic acid), ethyl cinnamate, 84% ee (3.5 mg GO) vs. 19% ee (5 equiv., 75 mg acetic acid)]. The X-ray photoelectron spectroscopy (XPS) spectra of GO before and after the reaction indicate that the intensities of C-O become stronger after the reaction, which may have a certain relationship with hydrogen peroxide (H2O2) and gives a reasonable rationale for the large consumption of H2O2. Also, part of the hydrogen peroxide was used for the oxidation of GO.
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