Bacteriogenic iron oxide as an effective catalyst for Baeyer-Villiger oxidation with molecular oxygen and benzaldehyde. Issue 50 (16th December 2015)

• Record Type: Journal Article
• Authors: Mandai, Kyoko; Hanata, Minae; Mitsudo, Koichi; Mandai, Hiroki; Suga, Seiji; Hashimoto, Hideki; Takada, Jun
• Is Part Of: Tetrahedron. Volume 71:Issue 50(2015)
• Page Start: 9403
• Page End: 9407
• Publication Date: 2015-12-16
• Subjects: Iron oxide -- Oxidation -- Baeyer-Villiger oxidation -- Silicon -- Synergetic effect; Chemistry, Organic -- Periodicals; 547.005
• DOI: 10.1016/j.tet.2015.10.057
• Languages: English
• ISSNs: 0040-4020

Abstract

Abstract: Iron oxide produced by iron-oxidizing bacteria, Leptothrix ochracea, ( L -BIOX) obtained from a freshwater purification plant, Joyo City in Kyoto, Japan catalyzed Baeyer-Villiger oxidation with molecular oxygen in the presence of benzaldehyde at 25 °C more efficiently than usual iron compounds. L -BIOX can promote the reactions of various substrates to give the desired products in sufficient yields and was found to be reusable. Scanning transmission electron microscopy and 57 Fe Mössbauer spectroscopy revealed that no change of the surface structure of L -BIOX was observed even after four times of the recycling test and the oxidation state of iron in L -BIOX is trivalent before and after the oxidation of cyclohexanone. An investigation with analogous amorphous iron oxides which contain silicon revealed that the catalytic activity of L -BIOX might stem from a synergetic effect of iron and silicon in the structure. Graphical abstract: