Enantiopure P‐aryl‐2,5‐diphenylphospholanes and its corresponding P‐aryl‐phospholanium salt appear as very efficientligands for rhodium‐catalyzed asymmetrichydrogenation reaction with similar activities and enantioselectivities. The hydrogenation product was obtained in good enantiomeric excesses (up to 93 % ee) in only few minutes under an atmospheric pressure of dihydrogen. The excellent activity