Abstract
The vibration frequencies ν(CO) and 2ν(CO) of meta and para substituted benzaldehydes XC 6H 4CHO have been studied by i.r. absorption. In most cases the observed spectra are composed of two or three bands. The solvent variation method shows that this multiplicity arises from Fermi resonance. A method is devised to calculate the unperturbed frequencies. Then it is verified that substituent effects are the same in benzaldehydes as in similar acetophenones XC 6H 4COCH 3.
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