Abstract: A method for the preparation of crystal form 1 of polymorphous crystalline torsemide, wherein torsemide is dissolved in an ethanol-water mixture with heating, after which the torsemide is subsequently cooled and dried once crystal separation has been performed. Drying takes place in a blade drier, for example, with the crystals being subjected to mechanical stress, wherein the crystals of crystalline form 2 are transformed into crystalline form 1.

Abstract: The invention relates to processes, which can be performed on an industrial scale, for the production of norgalanthamine, norgalanthamine derivatives and isomers thereof of general formula (A) as well as salts or hydrates thereof with general formula (B). As processes for the production of compounds with general formula (A) or (B), an oxidative demethylation and a catalytic demethylation of the corresponding galanthamine compounds are indicated.