A zwitterionic 1,2,3-triazolium amidate was designed
for use as
an effective modular hydrogen-atom transfer catalyst for photoredox
C–H functionalization. This zwitterionic amidate is stable
yet amenable to single-electron oxidation for generating a highly
reactive amidyl radical. In cooperation with an Ir-based visible-light
photoredox catalyst, the optimal catalyst enables the efficient direct
alkylation of the C–H bonds of various nitrogen- or oxygen-containing
organic compounds.