p-Toluenesulfinic Acid
Title: p-Toluenesulfinic Acid
CAS Registry Number: 536-57-2
Molecular Formula: C7H8O2S
Molecular Weight: 156.20
Percent Composition: C 53.83%, H 5.16%, O 20.49%, S 20.53%
Literature References: Prepd by reduction of p-toluenesulfonyl chloride with zinc dust: Whitmore, Hamilton, Org. Synth. 2, 89 (1922). Because the sulfinic acid is difficult to dry without partial conversion to the sulfonic acid, the sodium salt, CH3C6H4SO2Na.2H2O, is usually prepd. The free sulfinic acid is then obtained as needed by dissolving the sodium salt in cold water and carefully acidifying the soln with the exact amt of HCl needed.
Properties: Long, rhombic plates or needles from water. mp 85°. Freely sol in alc, ether; sparingly sol in water, hot benzene.
Melting point: mp 85°

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