Title: Methionic Acid
CAS Registry Number: 503-40-2
CAS Name: Methanedisulfonic acid
Molecular Formula: CH4O6S2
Molecular Weight: 176.17
Percent Composition: C 6.82%, H 2.29%, O 54.49%, S 36.40%
Line Formula: CH2(SO3H)2
Literature References: Prepn from methane + sulfur trioxide: Snyder, Grosse,
US 2493038 (1950 to Houdry Process); by H2SO4 oxidation of acetic acid: Schwab, Neuwirth,
Ber. 90, 567 (1957); from MeSO3H + SO3: Crowder, Gilbert,
US 2842589 (1958 to Allied Chem.). Prepn of aluminum salt: Christian, Jenkins,
J. Am. Pharm. Assoc. 39, 633 (1950);
US 2504107 (1950 to Purdue Res. Found.).
Properties: Crystals, mp 96-100°.
Melting point: mp 96-100°
Derivative Type: Aluminum salt
Molecular Formula: C3H6Al2O18S6
Molecular Weight: 576.42
Percent Composition: C 6.25%, H 1.05%, Al 9.36%, O 49.96%, S 33.38%
Properties: Crystals from water + alcohol. Hygroscopic. Soly in water at 27°: 69 w/v. pH of 5% aq soln = 3.5.
Use: Antiperspirant.
Therap-Cat: Aluminum salt as topical astringent.
Keywords: Astringent.
