80765-44-2Relevant academic research and scientific papers
Effects of α Substitution on the Carbonyl Stretching Frequencies of Phenyl Carboxylates
Almeida, Maria Ines de,Amaral, Antonia T. do,Amaral, Luciano do
, p. 1567 - 1571 (2007/10/02)
The infrared carbonyl stretching frequencies for several esters of the general formula R1R2R3C-COOPh were determined in carbon tetrachloride.The ?* and Es Taft parameters as well as the νCharton parameters for the same esters were determined.The carbonyl stretching frequencies are well correlated by a dual substituent parameter treatment: νC=O = νC=O0 + ρ*?* + δES or νC=O = νC=O0 + ρ*?* + ΨνCharton.In both cases the steric parameter is much larger than the polar parameter, suggesting that the effect of the substituents on the carbonyl stretching frequencies is of a steric nature, although a small contribution of the polar effect is observed.
