Phosphorus pentachloride → HCID 86693069, compound

Participants

Reaction Steps

Into a 20000-mL 4-necked round-bottom flask was placed a solution of 5-bromo-4-fluoro-9-azatricyclo[8.1.1.0[2,7]]dodeca-2,4,6-trien-8-one (800 g, 2.96 mol, 1.00 equiv) in toluene (10000 mL), followed by the addition of PCl5 (1540 g, 7.40 mol, 2.50 equiv) in several batches at 25° C. over 1 hour. The resulting solution was heated to reflux for 5 hr, cooled to room temperature and diluted with 5000 mL of ether. The solids were collected by filtration and dissolved in 10000 mL of ether. The resulting mixture was washed with 5000 mL of ammonia (10%), dried over anhydrous sodium sulfate and concentrated under vacuum to afford 700 g (82%) of 5-bromo-8-chloro-4-fluoro-9-azatricyclo[8.1.1.0[2,7]]dodeca-2,4,6,8-tetraene as a white solid.

Provenance & Evidence