Title: Rhodanine
CAS Registry Number: 141-84-4
CAS Name: 2-Thioxo-4-thiazolidinone
Additional Names: 2-thio-4-ketothiazolidine; 4-oxo-2-thionothiazolidine; rhodanic acid
Molecular Formula: C3H3NOS2
Molecular Weight: 133.19
Percent Composition: C 27.05%, H 2.27%, N 10.52%, O 12.01%, S 48.15%
Literature References: Prepd by the action of sodium chloroacetate on ammonium dithiocarbamate: Julian, Sturgis, J. Am. Chem. Soc. 57, 1126 (1935); Redemann et al., Org. Synth. coll. vol. III, 763 (1955).
Properties: Pale yellow crystals (long blades) from glacial acetic acid or water. d 0.868. mp 168.5° (capillary); mp 170.5-171° (hot stage). May explode on rapid heating. pK (25°) 5.52. Freely sol in boiling water, in methanol, ethanol, DMF, ether, alkalies, ammonia, hot acetic acid.
Melting point: mp 168.5° (capillary); mp 170.5-171° (hot stage)
pKa: pK (25°) 5.52
Density: d 0.868
Use: In the synthesis of phenylalanine.

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