The ionization energies of some substituted pyrroles have been determined by u.v. photoelectron spectroscopy. Relationship between the lowest ionization potentials and the Hammett σ constants have been determined. The different influence of substituents in the α- and β-positions is discussed.
C. Cauletti, C. Giancaspro, A. Monaci and M. N. Piancastelli, J. Chem. Soc., Perkin Trans. 2, 1981, 656 DOI: 10.1039/P29810000656
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