D-Lactic Acid

Title: D-Lactic Acid
CAS Registry Number: 10326-41-7
CAS Name: (2R)-2-Hydroxypropanoic acid
Additional Names: D(-)-lactic acid; levorotatory lactic acid; l-lactic acid; D-Milchsäure (German)
Molecular Formula: C3H6O3
Molecular Weight: 90.08
Percent Composition: C 40.00%, H 6.71%, O 53.28%
Literature References: Obtained by resolution of DL-lactic acid: Purdie, Walker, J. Chem. Soc. 61, 754 (1892); Borsook et al., J. Biol. Chem. 102, 449 (1933). Convenient laboratory prepn from glucose using Lactobacillus leichmannii: Brin, Biochem. Prep. 3, 61 (1953).
Properties: Crystals from ether + isopropyl ether, mp 52.8°. [a]54621.5 -2.6° (c = 8). pK = 3.83. Sol in water, alcohol, acetone, ether, glycerol. Practically insol in chloroform. Forms salts with many metals. Most of these salts are dextrorotatory.
Melting point: mp 52.8°
pKa: pK = 3.83
Optical Rotation: [a]54621.5 -2.6° (c = 8)
Derivative Type: Zinc D(+)-lactate
Molecular Formula: Zn(C3H5O3)2.2H2O
Molecular Weight: 279.58
Percent Composition: Zn 23.40%, C 25.78%, H 5.05%, O 45.78%
Properties: Crystals, [a]D14 +8.18° (c = 2.5).
Optical Rotation: [a]D14 +8.18° (c = 2.5)
DL-Fructose DL-Lactic Acid DL-Tartaric Acid D-Lyxose DMAN