Hydrochloric Acid → Levobunolol Hydrochloride

Participants

Reaction Steps

To the above toluenic solution containing levobunolol as free base, 16 ml ethanol and the stoichiometric amount of hydrogen chloride were added. The stirred mixture was cooled below 10° C. and kept at this temperature for one hour. The precipitated solid was filtered, washed with toluene, recrystallized twice from 43 ml ethanol and dried to give 10.0 g (51% yield) of levobunolol hydrochloride having a rotary power at 25° C. below -19°.

Provenance & Evidence