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solution of 3.4 g sodium hydroxide in 6 ml of water and then 14 g of 2,5-dichlorobenzaldehyde (H. Erdmann, Justus Liebigs Ann. Chem. 272, 155, 1893) are added to a solution of 10.8 g 2-fluorothiophenol (reference above) in 20 ml of hexamethylphosphortriamide. Then, the mixture is heated for 5.5 hours to 100° C. After cooling it is diluted with 150 ml of water and extracted with benzene. The extract is washed with a 5% sodium hydroxide solution and with water, dried with magnesium sulfate and evaporated. Crude 2-(2-fluorophenylthio) 5-chlorobenzaldehyde is obtained which is then recrystallized from 20 ml ethanol; 16.0 g, m.p. 85.5°-88° C. A further crystallization affords an analytically pure product, m.p. 87°-88° C.

1. temperatureThen, the mixture is heated for 5.5 hours to 100° C
2. temperatureAfter cooling it
3. extractionextracted with benzene
4. washThe extract is washed with a 5% sodium hydroxide solution and with water
5. dry with materialdried with magnesium sulfate
6. customevaporated