Oxidative benzylic C(sp³)-H functionalisation of electron-poor substrates with photoexcited DDQ.

ABSTRACT: 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) is a common oxidant used for myriad oxidation reactions, including the functionalisation of electron-rich benzylic C(sp³)-H bonds. Under photochemical excitation, DDQ becomes a far more powerful oxidant, though it has scarcely been utilised for C(sp³)-H functionalisation nor is the mechanism by which it operates well understood. Here, we report that photochemical excitation of DDQ enables oxidative functionalisation of previously inaccessible electron-poor benzylic C(sp³)-H bonds to form benzylic quinol ethers. The methodology is amenable to both batch and flow setups and is demonstrated across a series of primary and secondary benzylic substrates. Transient absorption spectroscopy revealed mechanistic insight

SUBMITTER: Atkins AP 

PROVIDER: S-EPMC12447515 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature