Butanal → HCID 85631103, compound

Participants

Reaction Steps

A suspension of 2.46 g of 3-aminopropylphosphonous acid in 20 ml of hexamethyldisilazane is heated to reflux under an inert gas for 24 hours. The resulting clear solution is cooled to room temperature and 14.8 g of freshly distilled n-butyraldehyde are added. An exothermic reaction ensues, the reaction temperature, rising to approximately 60° C. The reaction mixture is stirred for 1 hour at a temperature between 10° and 60°. After cooling to room temperature, the volatilematerials are removed in vacuo to yield a colourless oil. This oil is dissolved in water and stirred at room temperature for 1 hour and the aqueous layer is evaporated to dryness at 55°. A semi-solid residueis obtained which is dissolved in 50 ml of 2.0M aqueous hydrochloric acid and washed with dichloromethane, (3×100 ml), and ether (1×100 ml). After removal of the water the white solid is co-evaporated with water (10×50 ml), and then with 10×50 ml of absolute ethanol. Crystallisation of the residue form ethanol yields 3-aminopropyl(1-hydroxybutyl)phosphinic acid hydrochloride, m.p. 154°-160°. Treatment of the hydrochloride with propylene oxide/ethanol or passage through a DOWEX® 50 W×8 (14-40 mesh) ion-exchange column gives 3-aminopropyl(1-hydroxybutyl)phosphinic acid, m.p. 187°-188°, as a white solid.

Provenance & Evidence