An iridium-catalyzed enantioselective ring-opening of alkenyl oxiranes by unactivated carboxylicacids has been developed. The reaction undergoes at ambient conditions between an in-situ-generated chiral iridium-π-allyl complex and carboxylicacids to provide rapid access to valuable alkenyl diols in high yields. The synthetic utility of this method is demonstrated by the elaboration of the products