Mixed Oxides as Catalysts for the Condensation of Cyclohexanol and Benzaldehyde to Obtain a Claisen-Schmidt Condensation Product

被引:0
|
作者
Stoylkova, Tanya [1 ]
Stanimirova, Tsveta [1 ]
Chanev, Christo D. [2 ]
Petrova, Petya [3 ]
Metodieva, Kristina [1 ]
机构
[1] Univ Sofia St Kliment Ohridski, Fac Geol & Geog, Dept Mineral Petrol & Econ Geol, 15 Tsar Osvoboditel Blvd, Sofia 1504, Bulgaria
[2] Univ Sofia St Kliment Ohridski, Fac Chem & Pharm, Dept Organ Chem, 1 James Bourchier Blvd, Sofia 1164, Bulgaria
[3] Bulgarian Acad Sci, Inst Catalysis, Acad G Bonchev St,Block 11, Sofia 1113, Bulgaria
关键词
mixed oxides; cyclohexanol; Claisen-Schmidt condensation; 2,6-dibenzyliden-cyclohexanone; LAYERED DOUBLE HYDROXIDES; MG-AL HYDROTALCITES; BETA-POSITION; ALCOHOLS; METAL; ETHANOL;
D O I
10.3390/catal14070445
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Acid-base M2+MgAlO and M2+AlO mixed oxides (where M2+ = Mg, Cu, Co, Zn, and Ni) were obtained by thermal decomposition of the corresponding layered double hydroxide (LDH) precursors and used as catalysts for cyclohexanol and benzaldehyde condensation under solvent-free conditions. The catalysts were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), and temperature-programmed desorption of CO2 (TPD-CO2). Gas chromatography-mass spectroscopy (GC/MS) was used for the identification and quantification of the product mixtures. In the reaction of cyclohexanol and benzaldehyde on M2+MgAlO and MgAlO catalysts, a 2,6-dibenzylidene-cyclohexanone was obtained as the main product as a result of consecutive one-pot dehydrogenation of cyclohexanol to cyclohexanone and subsequent Claisen-Schmidt condensation. In the reaction mixture obtained in the presence of NiAlO, CoAlO, and ZnAlO catalysts, a cyclohexyl ester of 6-hydroxyhexanoic acid was detected together with the main product. This is most likely a by-product obtained after the oxidation, ring opening, and subsequent esterification of the cyclohexanol.
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页数:12
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