Photo‐induced Substitutive Introduction of the Aldoxime Functional Group to Carbon Chains: A Formal Formylation of Non‐Acidic C(sp³)−H Bonds

A photo‐induced substitutive introduction of an aldoxime functional group to carbon chains was achieved using photo‐excited 4‐benzoylpyridine as a C(sp 3 )−H bond cleaving agent and arylsulfonyl oxime as an aldoxime precursor. The non‐acidic C−H bonds in various substances, including cycloalkanes, ethers, azacycles, and cyclic sulfides, were chemoselectively converted at ambient temperature under neutral conditions. The present transformation is a formal formylation of non‐acidic C(sp 3 )−H bonds in a single step.