单双核金属配合物选择性催化氧化对甲氧基苦杏仁酸

doi:10.3866/PKU.WHXB201306282

Abstract

Abstract:

Three kinds of mononucleonic metal complexes of L¹Cu, L¹Co, and L¹Mn (L¹=N,N'-bis-(2-hydroxyethyl)-malondiamide), and three kinds of binucleonic metal complexes of L²Cu, L²Co, and L²Mn (L²= N,N'-bis{2-(2-hydroxyethylamino)ethyl}-malondiamide) were prepared. These complexes exhibited good catalytic performance for the selective oxidation of 4-methoxymandelic acid (4-MMA) by H₂O₂ in buffer solution, with >96% selectivity to anisaldehyde (AAD) and a small percentage to 4-methoxybenzoic acid (4-MBA). However, the reaction rates were quite different for these catalytic systems, in which the copper complex was the best candidate as the catalyst for the oxidation of 4-MMA. The binucleonic complexes displayed obviously better catalytic performance than the mononucleonic complexes. The effect of the applied buffers (tartaric acid (TA), H₃O₄, HAc) on the catalytic performance in terms of activities and selectivities for the oxidation of 4-MMA by H₂O₂ were investigated. The reaction kinetics of 4-MMA oxidation catalyzed by six complexes was studied in detail. The apparent first-order rate constants (k_obs) were obtained in the pH range of 2.5 to 4.5. The pHeffect on the catalytic oxidation was discussed in this paper.

Key words: 4-Methoxymandelic acid, Metal complex, Selective oxidation, Decarboxylation, Lignin

YU Wei-Feng, MENG Xiang-Guang, LIU Ying, LI Xiao-Hong. Selective Oxidation of 4-Methoxymandelic Acid Catalyzed by Mononucleonic and Binucleonic Metal Complexes[J].Acta Phys. -Chim. Sin., 2013, 29(09): 2041-2046.

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Selective Oxidation of 4-Methoxymandelic Acid Catalyzed by Mononucleonic and Binucleonic Metal Complexes

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