The infrared carbonyl stretching frequencies for several esters of the general formula R1R2R3C-COOPh were determined in carbon tetrachloride. The u* and E, Taft parameters as well as the vcbn parameters for the same esters were determined. The carbonyl stretching frequencies are well correlated by a dual substituent parameter treatment: uC4= v0-+ p* u*+ 6E, or vc4= v0-+ p* u*+ Wcharton. In both cases the steric parameter is much ...
