Ethyl 6-(4-chlorophenyl)-2,4,6-trioxohexanoate → Ethyl 6-(4-chlorophenyl)-4-oxo-4H-pyran-2-carboxylate

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Reaction Steps

A solution of ethyl 6-(4-chlorophenyl)-2,4,6-trioxohexanoate (0.26 g) in cold concentrated sulphuric acid (3 ml) was stirred for 3 hours at 0°-5° C. then poured on to ice (10 g). The solid product was recrystallised from ethanol-water to give the title product identical (mp, IR and NMR, and thin-layer chromatography) with the product described in Example 12.

Provenance & Evidence