Abstract
Visible-light-mediated C(sp3)-H activation has recently emerged as a powerful tool for functionalization of CH bonds. In this work, we reported that the triplet state of Lumiflavin is a good candidate to directly abstract hydrogen atom from C(sp3)-H substrates. Following photoexcitation by visible light (440nm), the organic molecule Lumiflavin (LF) can form the excited-state 3*LF, which is competent to oxidize a range of CH substrates. Product analysis and kinetic data showed that these reactions occurred via rate determining hydrogen-atom-transfer (HAT), with a linear correlation for log(k) vs BDE (CH) and KIE=3.2 for 9, 10-dihydroantracene (DHA).
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