p-Toluenesulfinic Acid CAS Registry Number: 536-57-2 对甲苯亚磺酸

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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.