Electronic coupling geminate radical pairs

Similar and more extensive studies have been made of the RLi 4 R Y reaction [77]. For the latter, results support a mechanism analogous to eq. (2.6). A geminate radical pair is formed by transfer of an electron from RLi to R Y these radicals couple and disproportionate in competition wulli diffusion from the cage. Polarized alkyl iodide spectra also result from abstraction of iodine atoms by free alkyl radicals. Metal halogen... 

Some interesting electronic coupling data have been obtained from log(/ca) vs. - AG° plots for charge recombination within geminate radical pairs. It was found that Hat, = 10.7 cm" when the donor is a one-ring aromatic and that H b = 7.8 cm" when the donor is a two-ring aromatic (53). Since... 

A related pair of products (48, 50, R = H) was obtained upon photoinduced electron transfer reaction between phenylcyclopropane (47, R = H) and N-methylphthalimide [234]. In this system, as in the various coupling reactions discussed above, the formation of ethers indicates that the coupling reaction of the radical ion pair is slow, in spite of its geminate nature. 

---