Ammonia → 2-Bromo-1,10-phenanthroline

Participants

Reaction Conditions

Reaction Steps

Under a stream of argon, to compound (2) (10 g; 47.6 mmol), phosphorus pentabromide (28 g; 65 mmol) and phosphorus oxybromide (50 g; 174 mmol) were added at room temperature. The reaction temperature was raised to 80° C. and the reaction mixture was stirred for 6 hours. The reaction mixture was cooled in an ice bath, and then poured into ice water. Concentrated aqueous ammonia was added thereto and the resulting mixture was made alkaline. The reaction mixture was extracted with chloroform, and the organic layer thus obtained was washed with water, dried over sodium sulfate, and then evaporated under reduced pressure. The resulting residue was separated and purified by silica gel column chromatography (SiO2, 250 g) (toluene/ethyl acetate=5/1 to 3/1 to 1/1 to ethyl acetate), to give 6.9 g (yield: 94%) of the title compound (7).

Provenance & Evidence