摘要：

An excellent linear relationship is observed between log (k/kH) for sixteen meta substituted t-cumyl chlorides and the Hammett meta substituent constants. The reaction constant, -4.54, is used to calculate a total of forty-one electrophilic substituent constants. The degree of constancy exhibited by these and other electrophilic substituent constants in representative aromatic substitutions and electrophilic side-chain reactions is examined. The data are used to estimate substituent constants for additional groups not examined Ui the t-cumyl system. These substituent constants correlate the available data on electrophilic aromatic substitution and electrophilic side-chain reactions with reasonably good precision.

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