ELECTROCHEMICAL REACTIONS .6. APPLICATION OF HAMMETT RELATIONSHIP TO POLAROGRAPHIC REDUCTION OF SUBSTITUTED 9-BENZYLIDENFLUORENES AND 3-PHENYLCOUMARINS

The influence of substituents on the half-wave potentials for the polarography of 9-benzylidenefluorenes in 68.1% methanol has been examined. The same linear correlation with Hammett σ-values and ρ = +0.23 volt is found for substituents on both the benzyl group and the fluorene ring. The half-wave potentials for substituted 3-phenylcoumarins in 68.1% methanol show two linear correlations with Hammett σ-values. Substituents on the phenyl group have ρ = +0.11 volt and substituents on the coumarin ring have ρ = +0.33 volt.