Acetone → Diacetone L-sorbose

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To 200 ml of acetone were added 10.0 g of L-sorbose and 223 mg of hydriodic acid (57%) and the mixture was refluxed with stirring in a water bath at 60° C. for 6 hours. During this reaction, the refluxing solvent was dried with 20 g of Molecular Sieves 3A interposed between the reaction vessel and the cooling jacket. After completion of the reaction, a small amount of pyridine was added. The acetone was then distilled off under reduced pressure and the residue was dissolved in benzene. The benzene solution was washed with aqueous sodium bicarbonate and water and dried over anhydrous magnesium sulfate. The benzene was distilled off under reduced pressure to give 12.13 g (84.0%) of 2,3:4,6-di-O-isopropylidene-L-sorbofuranose (purity ≥98%). Melting point: 77°-78° C. (recrystallized from petroleum ether).

Herkunft & Nachweise