Abstract
The vibration frequencies ν(CO) of twelve para substituted phenyl acetates p- XC 6H 4OCOMe have been studied by i.r. absorption. In some cases the observed spectra are composed of two or three bands. The solvent variation method shows that this multiplicity arises from Fermi resonance. The unperturbed frequencies are calculated by means of the method described above (part I). According to the Taft procedure, it is found that substituent effects are of the σ° type in phenyl acetates, and not of the σ − type as for corresponding phenols.
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