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the theoretical calculations of the electronic absorption spectra for group 3A meta110porphyrins.l~ In addition, this formulation is consistent with the ESR data of 3 which indicate that the initial reduction site occurs at the ligand and specifically at the tungsten atom. This formulation is also consistent with a shift of the potential for P radical formation to more negative values and would also suggest the formation of a transient [(P)In1(Mo(CO),Cp)]2-species after the second reduction and before cleavage of the metal-metal bond. Unfortunately, this dianion has not been isolated but is postulated to be a transient species by cyclic voltammetry.

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