5641. d-Lyxose

Nomenclature

CAS number: 1114-34-7
α-d-Lyxose.
C5H10O5; mol wt 150.13.
C 40.00%, H 6.71%, O 53.29%.

Description and references

Prepd by the oxidation of calcium d-galactonate: Clark, J. Biol. Chem. 31, 605 (1917); Fletcher et al., J. Am. Chem. Soc. 72, 4546 (1950); by γ-irradiation of lactose: Adachi, J. Dairy Sci. 45, 1427 (1962). Structure of β-d-lyxose: Hordvik, Acta Chem. Scand. 15, 1781 (1961).

Chemical structure

Properties

Hygroscopic monoclinic prisms from ethanol + ether, mp 106-107°. Sweet taste. d20 1.545. Shows mutarotation: [α]D20 +5.5° → -14.0° (c = 0.82 in water). Freely sol in water. One part dissolves in 38 parts abs alc at 17°; 100 ml of 90% alc satd at 20° contain 7.9 g.