Phosphorus oxychloride → HCID 13234213, compound

Participants

Reaction Steps

4-Isopropyl-1-(4-chloro-2-fluorophenyl)-1,2,4-triazolidine-3,5-dione (6.32 g; 0.023 mol) and phosphorus oxychloride (50 ml) were boiled with stirring for 30 hours. After completion of the reaction, excessive phosphorus oxychloride was removed by distillation under reduced pressure. The separated oily substance was poured into icewater and extracted with chloroform (50 ml) three times. The chloroform layer was washed with a saturated sodium chloride solution until the washings became neutral, dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The resulting oily substance was chromatographed on silica gel to give 2.5 g of 3-chloro-4-isopropyl-1-(4-chloro-2-fluorophenyl)-1,2,4-triazolin-5-one.

Provenance & Evidence