Figure 2. Strain-induced increase in s character in alkyl radicals leads to favorable borylations in competition experiments.

A positive correlation between the degree radical s character and borylation efficiency is demonstrated by competition experiments between radicals with varies s characters. See supplementary information section 8.1 for more details and discussion. a. Competition experiments were performed between BCP redox-active ester 1f and other alkyl bearing redox-active esters with B₂pin₂ in DMA under 390 nm light irradiation. b. Results indicate that higher s character in the radical leads to more favorable borylation with B₂pin₂.