Boron tribromide → HCID 13050868, compound

Participants

Reaction Steps

In methylene chloride was dissolved 8-hydroxy-1-methoxy-3-methyl-7,12-dihydro-5H-benzo[d]naphtho[2,3-b]pyran-5,7,12-trione (2 g), and under ice-cooling, a methylene chloride solution of boron tribromide (2 ml) was added dropwise. The mixture was further stirred at that temperature for 2 hours, at the end of which time it was washed with water and dried over magnesium sulfate. The solvent was then distilled off to give crude crystals. Recrystallization from methanol gave yellow crystals (1.1 g).

Provenance & Evidence