How is 3,3-Difluorocyclopentanamine hydrochloride (CAS: 939398-48-8) typically synthesized?

3,3-Difluorocyclopentanamine hydrochloride is typically synthesized by the reaction of 3,3-difluorocyclopentanamine with hydrochloric acid. The process involves the addition of the base to anhydrous HCl gas, followed by refluxing to form the hydrochloride salt. The reaction is carried out under atmospheric pressure in a round-bottom flask equipped with a condenser. The yield is typically around 85-90%.