“…However, the common Isotopic labelling procedures for obtaining deuterated aldehydes entail the use of reagents such as LiAlD 4 , deuterated Schwartz's reagent (Cp 2 ZrDCl), D 2 gas with iridium catalysts, or D 2 O with Ru catalysts and Pd/Ru with D 2 O, CO. Moreover, recent catalytic methods, [11–23] for the formation of deuterated aldehydes (aldehyde‐ d ) are restricted in their practical application due to harsh reaction conditions, unselective reactions, limited substrate scopes, low reagent availability, higher amount of base and catalyst, and less deuterium incorporation. These restrictions are particularly severe for aldehydes containing polar or electron‐withdrawing substituents, which are prone to side reactions.…”