Separation of n-substituted benzylidene-p-aminobenzoic acid conformers of biological activity

Several aldimines were produced by the reaction of p-aminobenzoic acid and certain substituted benzaldehydes. The products I-XII were resolved into their conformers via formation of solvates in a definite volume of appropriate solvent. The solvent differed in their volatility at room temperature. The structure of each compound was established by elemental analysis and IR, PMR spectral data. The antibacterial activities for all prepared compounds were examined

Synthesis and chelating properties of tartaric acid diamide derivatives

Diamide of L[+]-tartaric acid derivatives were prepared by the reaction of di-O-acetyl-L [+]- tartaric acid anhydride or di-O-benzoyl-L [+]-tartaric acid anhydride or methyl ester of L[+]-tartaric acid with isopropanolamine or ethanolamine. The structure of the compounds was confirmed by spectroscopic data and microanalysis. The compounds, especially di-O-acetyl derivatives, reacted with metal ions [Cu++, Ca++ and Mg++] in methyl alcohol at room temperature producing crystalline, water soluble products. The chelating behavior of the compounds toward some metal ions was studied by spectrophotometric and IR methods. The chelating properties of the compounds were highly affected by the type of O-substitute groups in tartaric acid derivatives