structural integrity and flexibility provided by intermolecular hydrogen bonds leads to the outstanding properties of the 6‐diphenylphosphinopyridin‐(2H)‐1‐one ligand (see scheme) in the rhodium‐catalyzed hydroformylation of terminal alkenes, as demonstrated by the combination of spectroscopic methods and DFT computations. Hydrogen bonds were also detected in a competent intermediate of the catalytic cycle