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The diethyl 2-trifluoromethylbenzylphosphonate (1.22 g, 4.12 mmol) was dissolved in a mixture of 50 mL of conc hydrochloric acid and 5 mL of EtOH and was heated at reflux temperature for 17 hours. After cooling the mixture in an ice bath, white crystalline acid was collected to give 0.46 g, 46% of the desired product, mp=190°-192° C.; D.C.I.M.S. [MH+, 241].

1. temperaturewas heated
2. temperatureat reflux temperature for 17 hours
3. temperatureAfter cooling the mixture in an ice bath
4. customwhite crystalline acid was collected