[CH2:1]([OH:3])C.[Na].[C:5]([O:14][CH2:15][CH3:16])(=[O:13])[CH2:6][CH2:7][C:8]([O:10][CH2:11][CH3:12])=[O:9].C(OCC)=O>C1(C)C=CC=CC=1.O>[CH:1]([CH:6]([CH2:7][C:8]([O:10][CH2:11][CH3:12])=[O:9])[C:5]([O:14][CH2:15][CH3:16])=[O:13])=[O:3]Ethanol (20 cm3) was added portionwise to a suspension of finely divided sodium (10.0 g) in dry toluene (100 cm3). On completion of the addition the mixture was heated for 3.5 hours at 80° C. To the resulting yellow suspension, cooled to 20° C., was added dropwise, over a period of 1 hour, a mixture of diethyl succinate (70.0 g) and ethyl formate (35.0 g), whilst the temperature of the mixture was maintained in the range 20° to 30° C. The mixture was kept at the ambient temperature for 16 hours after which water (100 cm3) was added carefully.
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