Interception of Criegee intermediate via tandem acetalization and fragmentation reaction provides a novel oxidative decarbonylation of malondialdehyde.
Herein, a photoredox-neutral strategy for carboxylation of acylated alcohols via C(sp3)–O bond activation and cleavage with tetrabutylammonium oxalate (TBAO) as the carbonyl source and reductant as well as the promoter is described. Neither a pre-established CO2 atmosphere nor external electron donors are required as the TBAO is crucial for the transformation. Various primary, secondary, and tertiary