Electrochemical Properties ofN-Substituted α-Diphenylphosphinoglycines

The electrochemical properties of theN-substituted alpha-diphenylphosphinoglycinesN-(2-methoxybenzyl) diphenylphosphinoglycine (1),N-(pyrazin-2-yl) diphenylphosphinoglycine (2),N-(1-adamantyl) diphenylphosphinoglycine (3), andN-(2,5-dimethoxycarbonylphenyl) diphenylphosphinoglycine (4) obtained in the three-component condensation of diphenylphosphine, glyoxylic acid hydrate, and the corresponding amine were studied by cyclic voltammetry on a glassy carbon electrode. The structure of compound4was confirmed by X-ray diffraction analysis. Compounds1-4exhibited electrochemical activity in the anodic region of potentials due to the presence of an oxidizable diphenylphosphine fragment in the molecule. Compound4can also be electrochemically reduced at the cathodic potentials of the working electrode due to the ester groups in the aromatic fragment.