Thionyl Chloride → Anthraquinone-2-carbonyl Chloride

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Reaction Steps

Anthraquinone-2-carboxylic acid (2.52 g, 10 mmol) was suspended in dichloro methane (100 ml). Thionyl chloride (50 ml) was added and the mixture heated to reflux in a nitrogen atmosphere for several hours giving a clear yellow solution. Dichloro methane and excess thionyl chloride was removed in vacuo giving a yellow solid. The solid was filtered off, washed several times with petroleum ether and dried in vacuo. Yield 2.69 g (99% from anthraquinone-2-carboxylic acid); MP: 143-144.5° C.; TLC (analyzed as the methyl ester: a small sample of the acid chloride was dissolved in dry methanol and analyzed immediately using ethyl acetate as eluent); Rf =0.68. MS (FAB+): 307.1 (MH+).

Provenance & Evidence