A thin-gap cell for selective oxidation of 4-methylanisole to 4-methoxy-benzaldehyde-dimethylacetal
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- 作者：Anis Attour ; Sabine Rode ; Athanassios Ziogas ; Michael Matlosz and Fran?ois Lapicque
- 关键词：Electroorganic synthesis ; 4 ; methylanisole oxidation ; Electrochemical microreactor ; Supporting electrolyte ; Process intensification
- 刊名：Journal of Applied Electrochemistry
- 出版年：2008
- 出版时间：March, 2008
- 年：2008
- 卷：38
- 期：3
- 页码：339-347
- 全文大小：523.1 KB
文摘
An electrochemical microreactor for organic electrosynthesis has been investigated for the anodic synthesis of 4-methylanisole to 4-methoxy-benzaldehyde-dimethylacetal in methanol solution. Selectivity and conversion in the single-pass thin-gap flow reactor were examined as a function of the composition of the electrolyte solution, the flow rate and the applied current. The experimental results indicate that potassium fluoride currently used for industrial synthesis and providing higher yields than sodium perchlorate, exerts an influence on the reaction mechanism: high KF concentrations facilitate the undesired oxidation of the diacetal. Nevertheless, a feed solution containing 0.1 M anisole in 0.01 M KF can be converted at 90 % in the 100 μm thin-gap cell with acceptable voltages and a measured selectivity of nearly 87 % . The selectivity observed substantially higher than that typically observed in conventional electrochemical cells.