abstract |
A crystalline paroxetine hydrochloride mixed solvate, that is more easily desolvated than the propan-2-ol solvate to form the anhydrate, is obtained by contacting crystalline propan-2-ol solvate with a transformation solvent. Suitable transformation solvents are an ether, ketone, chlorinated hydrocarbon, nitrile, lower alcohol, or ester, or a mixture thereof. <??>Crystalline paroxetine hydrochloride anhydrate is obtained by heating the mixed solvate in a vacuum oven. |