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Citation: Baojiao Gao, Liqin Zhang, Tao Chen. TEMPO immobilized on polymer microspheres-catalyzed oxidation of cyclohexanol by molecular oxygen[J]. Chinese Journal of Catalysis, ;2015, 36(8): 1230-1236. doi: 10.1016/S1872-2067(15)60902-0 shu

TEMPO immobilized on polymer microspheres-catalyzed oxidation of cyclohexanol by molecular oxygen

1.
Department of Chemical Engineering, North University of China, Taiyuan 030051, Shanxi China

Corresponding author: Baojiao Gao,
Received Date: 9 March 2015
Available Online: 16 May 2015

2,2,6,6-four methyl piperidine nitroxide (TEMPO) was bonded on crosslinked poly(glycidyl methacrylate) microspheres (CPGMA microspheres) by ring opening reactions between the epoxy group on the CPGMA microspheres and the hydroxyl group of 4-OH-TEMPO. The obtained heterogeneous TEMPO-immobilized polymeric (TEMPO/CPGMA) microspheres combined with a homogeneous co-catalyst Fe(NO₃)₃ was used in the oxidation of cyclohexanol by molecular oxygen. The catalytic property and catalytic mechanism were examined. This combination catalyst effectively catalyzed the oxidation of cyclohexanol by molecular oxygen to cyclohexanone as the only product. Both Fe³⁺ ion and NO₃^- ion in Fe(NO₃)₃ together played the role of co-catalyst. For this combination catalyst, under the conditions of 1:1 molar ratio of immobilized TEMPO to Fe(NO₃)₃, 55 ℃, ordinary pressure and with a suitable amount of this combination catalyst, the cyclohexanone yield was 44.1%, effectively transforming cyclohexanol to cyclohexanone under mild conditions.
- Nitroxide free radical,
- Poly (glycidyl methacrylate),
- Immobilization,
- Combination catalyst,
- Cyclohexanol oxidation,
- Molecular oxygen
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