Abstract
Effects of neutral and anionic substitutents on frequencies (ν CO) and integrated intensities ( A CO) of the carbonyl stretching bands of substituted methylbenzoates (solvent dimethyl sulphoxide) have been studied in relation to Hammett's equation: satisfactory correlations have been found between ν CO and σ + constants, as well as by using the dual-parameter equations to Yukawa, Tsuno and Taft; A CO have been found to increase in cases of strong electron-releasing substituents. It has been found that constants of anionic substituents, determined on the basis of nitrile i.r. frequencies and intensities, reflect satisfactorily the effects of these substituents on ν CO and A CO of methylbenzoates.
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