Phosphorus pentachloride → HCID 59562418, compound

Participants

Reaction Steps

To a suspension of 2,2,6,6-tetramethylpyran-3,5-dione (741 mg, 4.35 mmol) in chloroform (10 ml) is added phosphorus pentachloride (454 mg, 2.18 mmol), and the reaction is heated to reflux for 5 hours. Silica gel is added to the cooled crude reaction mixture, the solvent is evaporated under reduced pressure and the residue is purified by flash chromatography on silica gel to give 5-chloro-2,2,6,6-tetramethyl-6H-pyran-3-one (349 mg).

Provenance & Evidence