Thianthrenium-Enabled Phosphorylation of Aryl C-H Bonds via Electron Donor-Acceptor Complex Photoactivation

Anefficient strategy for the preparation of aryl phosphonatesvia blue-light-promoted single electron transfer process of an EDAcomplex between phosphites and thianthrenium salts has been demonstrated.The corresponding substituted aryl phosphonates were obtained in goodto excellent yields, and the byproduct thianthrene can be recoveredand reused in quantity. This developed method realizes the constructionof aryl phosphonates through the indirect C-H functionalizationof arenes, which has potential application value in drug discoveryand development.