Photoinduced C-Br bond cleavage enables difluoroketene-mediated ground-state [2 + 2] cycloaddition: a TD-DFT study.
This work presents a TD-DFT computational study of the visible-light-driven [2 + 2] cycloaddition between alkynes and bromodifluoroacetylsilanes, leading to gem-difluorocyclobutenones. Visible-light irradiation of bromodifluoroacetylsilanes was recently shown by Zhou et al. to generate difluoroketene in situ for [2 + 2...