[Na].[Cl:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[OH:9].[O:10]1[CH2:14][CH2:13][CH2:12][C:11]1=[O:15]>C(O)C>[Cl:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[O:9][CH2:14][CH2:13][CH2:12][C:11]([OH:15])=[O:10]To a solution of sodium (405 mg, 1.08 mmol) in ethanol (11.1 mL) was added 2-chlorophenol and the reaction mixture was stirred for 5 minutes before adding dihydro-furan-2-one (1.4 g, 16.1 mmol). The reaction mixture was stirred for 5 hours at 100° C. after which time the ethanol was slowly evaporated by continuous heating to 150° C. for another 12 hours. After such time the residue was dissolved in water (7 mL) and aqueous hydrochloric acid (1N) was added until precipitation occurred. The precipitate was isolated by filtration, washed with water and dried in vacuo to yield the title compound as yellow solid (2.79 g, 80.4%).
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