Abstract
A general characteristic of cathodic reduction of α-phenylvinylphosphonic acid and its methyl- and chloro-parasubstituted derivatives on Pt/Pt, Pd/Pt, and Pd/Pt modified with Cd and Cu adatoms, is given. At effective pressures of about 103–104 Pa the processes occur at high rates and at some potentials are limited by the reactant diffusion from the bulk solution. In the presence of Cd and Cu adatoms two reduction waves (presumably, single-electron) may be isolated, i.e. the hampering by adatoms is more pronounced for a second successive stage of the process. At low effective hydrogen pressures the hydrogenation rate is higher on Pd electrodes, which possess a larger sorption capacity. Potential intervals where the reduction of substituted reactants may be complicated by destruction, are found. It is shown that α-phenylvinylphosphonic acid undergoes a complete reduction with a current efficiency of 100% in both hydrochloric- and sulfuric-acid solutions. Conditions where the reduction of α-(4-chlorophenyl)vinylphosphonic acid proceeds largely without destruction are found. Prospects for use of electrochemical reduction as a preparative method of a selective production of α-arylethylphosphonic acids are considered.
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Smirnova, N.V., Gulyukina, N.S., Astaf'ev, E.A. et al. Electrochemical Hydrogenation of α-Arylvinylphosphonic Acids on Platinum and Palladium Modified with Adatoms. Russian Journal of Electrochemistry 38, 626–632 (2002). https://doi.org/10.1023/A:1016002618106
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DOI: https://doi.org/10.1023/A:1016002618106