Study On Catalytic Oxidation Of Alcohols In Ionic Liquid By Metal Complexes

Ionic liquids are liquid salts at room temperature which are composed by anions and cations. Oxidations of alcohols are catalyzed by the method based on metal compounds and ionic liquids, which not only make catalysts reusably, but also have important meaning and application for the green chemical engineering.Catalyzed oxidation of alcohols by copper acetylacetonate in ionic liquid was studied. For optimizing the reaction condition, the influence of several factors on reaction was studied, and then a satisfied reaction condition was obtained in 5 hours at room temperature with 2 mmol 1-Phenylpropan-1-ol, 10 mmol t-BuOOH, 3 mol% copper acetylacetonate and 1 mL [bmim]PF6. In this condition, the conversion and yield of 1-Phenylpropan-1-ol was 93% and 87%. The sec-alcohols of benzylic and aliphatic alcohols were all oxidized to the corresponding ketones with t-BuOOH as oxygen resource in this catalytic condition. The catalytic system can be recycled and reused for five runs without any significant loss of catalytic activity.N-acac-amino acid-M and Sal-amino acid-M were synthesized by changing structure of complexes based on copper acetylacetonate in order to study the influence between catalyzed ability and complexes. The molecular structures were confirmed by FT-IR, TGA, EA and NMR, etc. N-acac-amino acid-Cu and Sal-amino acid-Mn were satisfied catalytic system by studying the factors on reactions. The N-acac-amino acid-Cu system oxidized not only the sec-alcohols of benzylic and aliphatic alcohols to corresponding ketones, but also the primary alcohol to the corresponding carboxylic acid. The catalytic system can be recycled and reused for five runs without any significant loss of catalytic activity. The selectivity of primary alcohols was improved due to introduced amino acid to metal complexes. For the Sal-amino acid-Mn catalytic system, the selectivity of products was the same as the copper acetylacetonate catalytic system, but it cannot be reused.Metal complexes task-special ionic liquids with ionic liquid tags were synthesized in order to improved the reusability of catalytic system. The molecular structures were confirmed by FT-IR, TGA, EA and NMR, etc. It should be noted that the catalytic ability was greatly improved by these Metal complexes task-special ionic liquids, but the reusability still needed to improve.Oxidations of benzylic and aliphatic alcohols were catalyzed efficiently by [bmim]BF4/NaClO system. This system oxidized not only the sec-alcohols to the corresponding ketones, but also the primary alcohols to the corresponding carboxylic acid. What's more, the catalytic system can be recycled and reused for five runs without any significant loss of catalytic activity.