Infrared Spectrography: Valence Frequencies of the Carbonyl Group of a Series of Mono- and di- Substituted Benzoic Acids and Esters: Relationship with the pK of the Acids

摘要

The results concern 14 benzoic acids, 61 substituted toluic acids, and 51 corresponding methyl esters. In the acids, the frequency nu /sub c=0/ of the carboxylic dimer is 40 to 45 cm exp -1 less than in the monomer. In the methyl esters, except the ortho-amino esters, the frequency nu /sub c=0/ is reduced by 13 cm exp -1 relative to the monomer acid. Several cases are distinguished with respect to the pK. (ERA citation 04:014178)