Sodium Hydroxide → Rotigotine

Participants

Reaction Steps

2400 g Rotigotine hydrochloride were added to a solution of 272.8 g NaOH in 3488 g ethanol (96%). The resulting mixture was stirred for approximately 10 minutes. Then 379.2 g of sodium phosphate buffer solution (27.6 g Na2HPO4×2H2O) and 53.2 g NaH2PO4×2H2O in 298.5 g water) was added. Insoluble or precipitated solids were separated from the mixture by filtration. The filter was rinsed with 964 g ethanol (96%) to obtain a particle-free ethanolic solution of rotigotine essentially in the form of the free base.

Provenance & Evidence