Aromatic rings, oxidation ipso substitution

Cyclic voltammetry experiments were used to quantify the oxidation potentials of these species (Ru to Ru ), showing that the substitution pattern of the alkoxystyrene ligand had an effect on the electron density at the metal center. This effect was communicated via the mthenium car-bene moiety, as shown by a good Hammett correlation when the carbene moiety was connected to the ipso carbon of the aromatic ring, and a poor correlation when the alkoxy substitutent was connected to the ipso position. 

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