Scheme 4. Various SSB Pathways through the Formation of a Phosphate-Centered TNI*.

Processes 4 and 5, which result in the formation of C3′_dephos• and C5′_dephos•, account for nearly a majority of the products.^11,14,25 R′PO₂^•– and the nonradical anion moiety formed in process 6 are due to the P–O bond cleavage which occurs only to a minor extent.^11,14,25