Mechanism of Reduction of Primary Alkyl Radicals by SmI<sub>2</sub>−HMPA

The measured value of <i>E</i>°(SmI<sub>2</sub><sup>+</sup>−HMPA − SmI<sub>2</sub>−HMPA) was used in combination with literature values for the <i>E</i>° of primary radicals to estimate the bimolecular rate constant for an outer-sphere electron transfer (ET). Comparison with the experimentally measured rate constant is consistent with an outer-sphere ET.