Evaluation of carbon electrodes and electrosynthesis of coumestan and catecholamine derivatives in the FM01-LC electrolyser |
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Authors: | D Szanto P Trinidad F Walsh |
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Affiliation: | (1) Applied Electrochemistry Group, School of Pharmacy, Biomedical and Physical Sciences, University of Portsmouth, St Michael's Building, White Swan Road, Portsmouth, PO1 2DT, Great Britain |
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Abstract: | This work extends the range of electrodes and conditions under which the FM01-LC reactor has been used in a laboratory environment and evaluates the performance of carbon electrodes. Reticulated vitreous carbon (RVC) has been used to provide a stable, inert, three-dimensional electrode surface for organic electrosynthesis; its performance is compared to that of nickel mesh for the oxidation of catechol to o-quinone. This product was then reacted in situ with (i) 4-hydroxycoumarin and (ii) 1,3-dimethylbarbituric acid to produce, respectively, coumestan and catecholamine, products of synthetic interest. In mass transport experiments using hydroquinone oxidation as a model reaction, performance was similar to nickel electrodes, but Sherwood numbers were reduced by about 5–10% when carbon electrodes were used. The best-performing RVC electrode, however, showed poorer behaviour than its nickel counterpart. Yields for the production of coumestan and catecholamine were approximately 45% and 25%, respectively, although this was mostly due to extraction problems, since current efficiencies were both in the region of 65–70%. The electrode material, rather than the fluid flow behaviour, leads to a reduction in overall cell efficiency; this is confirmed by studies which show a film forming on the surface of the electrode. |
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Keywords: | filter press parallel plate electrochemical reactor design electroorganic synthesis FM01-LC electrolyser |
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