Linear free energy relationships of half-wave reduction potentials of (E)-4-aryl-4-oxo-2-butenoic acids
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Half-wave reduction potentials of a set of twelve (E)-4-aryl-4-oxo-2-butenoic acids obtained by direct current polarography in methanol are reported. E(1/2) is correlated with Hammett sigma values as well as with values of frontier molecular orbitals calculated at a semiempirical molecular orbital level. Constant potential electrolysis of a representative compound shows that the first polarographic wave corresponds to one-electron reduction. The isolation of the product proves reduction of the activated double bond. (C) 2009 Elsevier Ltd. All rights reserved.
Keywords:Aroylacrylic acids / Half-wave potentials / Linear free energy relationship / Hammett sigma / Frontier orbitals
Source:Tetrahedron Letters, 2010, 51, 4, 734-738
- Pergamon-Elsevier Science Ltd, Oxford