Authors:Robert A. Green, Richard C. D. Brown and Derek Pletcher
In recent papers, laboratory microfluidic electrolysis cells with extended channel lengths (0.7–2 m) and narrow interelectrode gap (≤0.5 mm) have been introduced; these cells permit high conversions at a flow rate consistent with the synthesis of products at a rate of multigrams/hour. Such microflow electrolysis cells must be operated with appropriate control parameters if good performance is to be achieved; thus, this paper emphasizes the correct selection of cell current, flow rate, and counter electrode chemistry. It is also shown that, within the limitations, the cells can be used for a number of electrosyntheses in the synthetic laboratory.
Authors:Ruiqin Zhao, Yuhai Tang, Saili Wei, Xiaoqian Xu, Xiaoyu Shi and Guangbin Zhang
olefins [ 14 – 18 ]. As the system gave good results only for electrophilic olefins, such as α,β-unsaturated ketones, the electrosynthesis of NaClO was considered in order to widen the scope of olefin substrates. Tanaka and co-workers gave a new design for
, and processes such as the Kolbe electrolysis [ 3 ] or the Hall–Héroult process for aluminium production [ 4 ] are described in many textbooks. Due to these developments, organic electrosynthesis is nowadays a versatile method with a large number of
Authors:Robert Green, Richard Brown and Derek Pletcher
In order for microflow electrolysis cells to make their full contribution to routine laboratory organic synthesis, they must be capable of carrying out reactions with good selectivity and high conversion at a high rate of conversion. In addition to appropriate choice of the electrolysis medium and control of the overall cell chemistry, both the design of the electrolysis cell (including materials of construction) and the correct selection of the cell current and flow rate of the solution are critical in determining performance. The conclusions are tested using the methoxylation of N-formylpyrrolidine as the test reaction in a microflow electrolysis cell with a single, long, patterned flow channel.
Authors:Tsuneo Kashiwagi, Fumihiro Amemiya, Toshio Fuchigami and Mahito Atobe
We have successfully demonstrated that a microflow reactor is extremely useful in controlling reactions involving an unstable o-benzoquinone. As a model reaction, Michael addition reaction between o-benzoquinone generated from electrochemical oxidation of catechol and benzenethiols was employed. This reaction system enables selective oxidation of catechol avoiding the oxidation of benzenethiol, although these oxidation potentials are close to each other. The examination of several reaction conditions indicated that the key features of the method are an effective o-benzoquinone generation and its rapid use for the following reaction without decomposition in a microflow system. In addition, cyclic voltammetry measurements elucidated that catechol concentration and selection of anode material were crucial factors for effective o-quinone generation.
. Bender Environmental Science & Technology 2015 , 49 , 8602 – 8610
“ Selective enrichment establishes a stable performing community for microbial electrosynthesis of acetate from CO 2 ” S. A. Patil , J. B. A. Arends , I
Authors:Gellért Sipos, Tamás Bihari, Dorottya Milánkovich and Ferenc Darvas
carbon dioxide is an emerging area . It does not require much imagination to conceptualize a light powered continuous-flow electrosynthesis system for methanol production. It is important to note that most often O 2 is produced on the anode as a