Thiosalicylic Acid
Title: Thiosalicylic Acid
CAS Registry Number: 147-93-3
CAS Name: 2-Mercaptobenzoic acid
Additional Names: o-sulfhydrylbenzoic acid
Molecular Formula: C7H6O2S
Molecular Weight: 154.19
Percent Composition: C 54.53%, H 3.92%, O 20.75%, S 20.80%
Literature References: Prepd by heating o-halogenated benzoic acids with an alkaline hydrosulfide in the presence of copper: DE 189200 (1906); by reduction of dithiosalicylic acid: Claasz, Ber. 45, 2427 (1912); DE 205450; C. F. H. Allen, D. D. MacKay, Org. Synth. coll. vol. II, 580 (1943).
Properties: Sulfur-yellow flakes, plates, needles from glacial acetic acid or alcohol. Softens at 158°. mp 164-165°. Sublimes. Slightly sol in hot water; freely in glacial acetic acid, alc. Exposure to air yields dithiosalicylic acid, which is produced also when an alcoholic soln of thiosalicylic acid comes in contact with FeCl3 (resulting in a transitory blue color).
Melting point: mp 164-165°
Derivative Type: Sodium salt
Trademarks: Jecto-Sal (Mallard); Thiocyl
Molecular Formula: C7H5NaO2S
Molecular Weight: 176.17
Percent Composition: C 47.72%, H 2.86%, Na 13.05%, O 18.16%, S 18.20%
Properties: Crystals, sol in water.
Use: Manuf thioindigo dyes, reagent for determn of iron.

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