The Multiple Facets of Oxalate Dianion in Photochemistry

Abstract Oxalate salts are cheap and available reagents used in organic photochemistry as C1‐synthons, single‐electron transfer (SET) reductants, and hole scavengers. Relying on these multiple roles, a critical comparison of recent applications provides a roadmap to the diverse reductive functionalizations, highlighting the unmet challenges and the future developments.