Thiolactic Acid
Title: Thiolactic Acid
CAS Registry Number: 79-42-5
CAS Name: 2-Mercaptopropanoic acid
Additional Names: 2-mercaptopropionic acid; 2-thiolpropionic acid; a-mercaptopropanoic acid
Molecular Formula: C3H6O2S
Molecular Weight: 106.14
Percent Composition: C 33.95%, H 5.70%, O 30.15%, S 30.21%
Line Formula: CH3CH(SH)COOH
Literature References: First prepd from a-chloropropionic acid and potassium hydrosulfide: Schacht, Ann. 129, 3 (1864); prepn from a-chloropropionic acid and sodium thiosulfate: Martin, US 2413361 (1946 to Martin Labs). From sodium sulfide, sulfur and a-bromopropionic acid: Dumesnil, US 2985557 (1961 to Frank E. Jonas). Review: Reid, Organic Chemistry of Bivalent Sulfur vol. I (Chemical Publ. Co., New York, 1958) p 449.
Properties: Oil, disagreeable odor. Solidif on cooling, crystals mp about 10°. d415 1.220. bp16 117°. nD16 1.4823. Miscible with water, alcohol, ether, acetone.
Melting point: mp about 10°
Boiling point: bp16 117°
Index of refraction: nD16 1.4823
Density: d415 1.220
 
Derivative Type: Copper salt
Molecular Formula: C3H5CuO2S
Molecular Weight: 168.68
Percent Composition: C 21.36%, H 2.99%, Cu 37.67%, O 18.97%, S 19.01%
Properties: Yellow precipitate. Practically insol in water and in dil HNO3.
 
Derivative Type: Barium salt
Molecular Formula: Ba(C3H5O2S)2
Molecular Weight: 347.60
Percent Composition: Ba 39.51%, C 20.73%, H 2.90%, O 18.41%, S 18.45%
Properties: Rubbery compd, very sol in water. Practically insol in alcohol.
 
Derivative Type: Mercury salt
Molecular Formula: Hg(C3H5O2S)2
Molecular Weight: 410.86
Percent Composition: Hg 48.82%, C 17.54%, H 2.45%, O 15.58%, S 15.61%
Properties: Small shiny platelets, sparingly sol in water, very sol in alcohol.
 
Derivative Type: Sodium salt pentahydrate
Molecular Formula: C3H5NaO2S.5H2O
Molecular Weight: 218.20
Percent Composition: C 16.51%, H 6.93%, Na 10.54%, O 51.33%, S 14.70%
Properties: Crystals. Dec about 250°. Sol in water, methanol, ethanol. Less sol in propanol.
 
Derivative Type: Calcium salt decahydrate
Molecular Formula: Ca(C3H5O2S)2.10H2O
Molecular Weight: 430.50
Percent Composition: Ca 9.31%, C 16.74%, H 7.02%, O 52.03%, S 14.90%
Properties: Crystals. Dec 270°. Sol in water, methanol, ethanol. Less sol in propanol.
 
Derivative Type: Platinum salt
Molecular Formula: Pt(C3H5O2S)2
Molecular Weight: 405.36
Percent Composition: Pt 48.13%, C 17.78%, H 2.49%, O 15.79%, S 15.82%
Properties: Greenish-yellow precipitate. Practically insol in water and dil acids. Sol in sodium hydroxide and sodium carbonate.
 
Derivative Type: Silver salt
Molecular Formula: C3H5AgO2S
Molecular Weight: 213.00
Percent Composition: C 16.92%, H 2.37%, Ag 50.64%, O 15.02%, S 15.05%
Properties: Yellow precipitate. Practically insol in water and dil HNO3.
 
Use: In depilatory and hair waving prepns.

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