Thioglycolic Acid → 2-(2,5-Dichlorophenyl)-2-mercaptoacetic acid

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Using the same procedure as in Example 8, 45.2 g (0.2 mol) of 1-bromo-2,5-dichlorobenzene, 23.7 g (0.4 mol) of 95% potassium hydroxide, 18.4 g (0.2 mol) of thioglycolic acid and 320 g of N-methyl-2-pyrrolidone were added, followed by stirring at 140° to 150° C. for 2 hours. Then, 30.4 g (0.26 mol) of sodium monochloroacetate was added to the reaction solution, followed by stirring at 90° C. for 1 hour. After distilling off the solvent, 300 g of water and 50 g of toluene were added for layer separation. To the water layer was added 45 g of concentrated hydrochloric acid, and the mixture was cooled to room temperature. The resulting crystal was filtered and dried to yield 34.0 g of 2,5-dichlorophenylthioglycolic acid with a yield of 71.7%. The results are given in Table 2.

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