A systematic comparison is made, by using six different scales of substituent parameters, of the -, ß-, and -carbon-13 chemical shifts for the olefinic moiety in four series of styrene derivatives. There is no systematic significant superiority, in general, of a dual substituent parameter (DSP) treatment with respect to the simpler single substituent parameter (MSP) treatment. In the case of the 7-carbons, with the former type of analysis, the inductive effect is found to be more sensitive than the resonance effect to configurational differences.Many studies deal with linear free energy relationships (LEER),1 applied to NMR chemical shifts, especially to 13C values, with a view either to gain some insight into the (1) J. Shorter, "Correlation Analysis in Organic Chemistry", Clarendon Press, Oxford, 1973.

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