Abstract
The i.r. spectra from 1 300 to 1 650 cm–1 of a number of meta- and para-substituted N-ammoniobenzamidates have been studied. The strong bands near 1 560 and 1 355 cm–1 in water are assigned to asymmetrical and symmetrical stretching vibrations of the CO group. The coupling of νa(CO) and ν8 ring modes is shown up by the solvent variation method. It causes the failure of the Hammett equation for νa(CO). The similarity of the mechanics of vibration of the benzamidate and benzoate groups is emphasized.
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