Interactions of arenes and thioethers resulting in facilitated oxidation

(Figure Presented) Synthesis of 6-endo and 6-exomethylthio-2- endoarylbicyclo[2.2.1]heptanes was accomplished stereoselectively. The ionization energies, determined by photoelectron spectroscopy, and electrochemical oxidation potentials, determined by cyclic voltammetry, were lower for the 6-endomethylthio compounds than for their 6-exomethylthio analogues. Calculations supported the notion that facilitation of electron transfer in the 6-endomethylthio compounds results from through-space S⋯π interaction.