[CH3:1][O:2][C:3](=[O:15])[C:4]1[CH:13]=[C:12]([OH:14])[CH:11]=[C:6]([C:7]([O:9][CH3:10])=[O:8])[CH:5]=1.C([O-])([O-])=O.[K+].[K+].[CH2:22](I)[CH3:23]>CN(C=O)C.O>[CH3:10][O:9][C:7](=[O:8])[C:6]1[CH:11]=[C:12]([O:14][CH2:22][CH3:23])[CH:13]=[C:4]([C:3]([O:2][CH3:1])=[O:15])[CH:5]=1To a suspension of 10 g (47.57 mmol) 5-hydroxy-isophthalic acid dimethyl ester and 9.86 g (71.36 mmol) K2CO3 in 50 ml DMF is added dropwise 7.67 ml (95.1 mmol) ethyl iodide. After the addition the mixture is stirred for 5 h, diluted with water and extracted with TBME. The organic phase is washed with water, dried with sodium sulfate and evaporated to give the title compound.
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