Abstract

Abstract The diastereoisomers of the ethyl-2,2,2-trichloroethyl diester of optically active 1-amino-1-phenylmethanephosphonic acid derivatives were examined by 1H NMR and IR methods. The configuration of the phosphorus atom in each diastereoisomer was determined on the basis of conformational analysis using 1H NMR spectra. Calculations of the location of the methylene protons in the trichloroethyl group as a function of dihedral angles were performed and compared with the experimental values.

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