Bromine → HCID 13059708, compound

Participants

Reaction Steps

Dissolve 7-chlorothiochroman-4-one (10 gms., 50.3 mmols) in chloroform (100 ml.) and cool the solution to 0°-5° C. Add bromine (2.60 ml., 50.3 mmols) dropwise over a 10-minute period. Stir the reaction mixture at room temperature for one hour, then add chloroform (100 ml.) and extract with 10% aqueous sodium sulfite (100 ml.) followed by water (200 ml.). Dry the chloroform solution over anhydrous magnesium sulfate, filter and evaporate in vacuo to a residue. Recrystallize the residue from cyclohexane to give 3-bromo-7-chlorothiochroman-4-one, m.p. 109°-110° C.

Provenance & Evidence