Title: meso-Tartaric Acid
CAS Registry Number: 147-73-9
CAS Name: (2R,3S)-rel-2,3-Dihydroxybutanedioic acid
Additional Names: mesotartaric acid; internally compensated tartaric acid; unresolvable tartaric acid; Antiweinsäure (German)
Molecular Formula: C4H6O6
Molecular Weight: 150.09
Percent Composition: C 32.01%, H 4.03%, O 63.96%
Literature References: Prepd by boiling L-tartaric acid with alkali; as byproduct of racemization: Winther, Z. Phys. Chem. 56, 507 (1906); Holleman, Org. Synth. coll. vol. I (2nd ed., 1941) p 497; Milas, US 2414385 (1947). Microbial prepn: Martin, Foster, J. Bacteriol. 70, 405 (1955); Foster, US 2947665 (1960). Explanation of optical inactivity: Noller, Science 102, 508 (1945); C. R. Noller, Chemistry of Organic Compounds (Philadelphia, 2nd ed., 1957) p 339.
Derivative Type: Monohydrate
Properties: Rectangular plates, d420 1.666 (also reported as 1.737). mp 140° (also reported as 159-160°). pKa1 3.11; pKa2 4.80. Maximum soly in water at 20°: 125 g/100 ml.
Melting point: mp 140° (also reported as 159-160°)
pKa: pKa1 3.11; pKa2 4.80
Density: d420 1.666 (also reported as 1.737)
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