Efficient cyclohexane oxidation with hydrogen peroxide catalysed by a C-scorpionate iron(II) complex immobilized on desilicated MOR zeolite

Authors:   L.M.D.R.S. Martins, A. Martins, E.C.B.A. Alegria, A.P. Carvalho, A.J.L. Pombeiro

Abstract:
The hydrotris(pyrazol-1-yl)methane iron(II) complex [FeCl₂{ŋ³-HC(pz)₃}] (Fe, pz = pyrazol-1-yl) immobilized on commercial (MOR) or desilicated (MOR-D) zeolite, catalyses the oxidation of cyclohexane with hydrogen peroxide to cyclohexanol and cyclohexanone, under mild conditions. MOR-D/Fe (desilicated zeolite supported [FeCl2{ŋ³-HC(pz)₃}] complex) provides an outstanding catalytic activity (TON up to 2.90 × 10³) with the concomitant overall yield of 38%, and can be easy recovered and reused. The MOR or MOR-D supported hydrotris(pyrazol-1-yl)methane iron(II) complex (MOR/Fe and MOR-D/Fe, respectively) was characterized by X-ray powder diffraction, ICP-AES, and TEM studies as well as by IR spectroscopy and N₂ adsorption at −196^◦C. The catalytic operational conditions (e.g., reaction time, type and amount of oxidant, presence of acid and type of solvent) were optimized.

Keywords:
C-scorpionates iron(II)
Cyclohexane oxidation
Supported catalysis
Desilicated MOR zeolite

Published in: Applied catalysis A: General  (Volumes 464–465, Pages 1-384, 15 August 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Efficient cyclohexane oxidation with hydrogen peroxide catalysed by a C-scorpionate iron(II) complex immobilized on desilicated MOR zeolite

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