[CH3:1][CH:2]([CH3:11])[C:3](=[O:10])[CH2:4][C:5]([O:7][CH2:8][CH3:9])=[O:6].[C:12]([O:16][CH3:17])(=[O:15])[CH:13]=[CH2:14]>C1CCN2C(=NCCC2)CC1.C1CCCCC1>[CH3:17][O:16][C:12](=[O:15])[CH2:13][CH2:14][C:4]([C:5]([O:7][CH2:8][CH3:9])=[O:6])([C:3](=[O:10])[CH:2]([CH3:1])[CH3:11])[CH2:3][CH2:4][C:5]([O:7][CH3:8])=[O:6]12.0 g (0.08 mol) of ethyl 4-methyl-3-oxo-pentanoate and 0.5 g (0.003 mol) of DBU were placed in a three necked round bottom flask, equipped-with dropping funnel and reflux condenser. At room temperature, 16.0 g (0.18 mol) of methyl acrylate was slowly added drop by drop. After the exothermal behavior of the reaction leveled off, the reaction mixture was stirred at 60° C. for an additional two hours. The mixture was poured into cyclohexane and was washed with diluted hydrochloric acid and was subsequently washed with distilled water until the aqueous layer was neutral. The organic layer was dried over sodium sulfate, the solvent was removed, and the addition product was isolated by fractional distillation in a vacuum. 15.0 g (0.045 mol) of 4-(ethoxycarbonyl)-4-(2-methyl-1-oxopropyl)-heptanedioic acid 1,7-dimethyl ester was obtained (yield: 56%; boiling point: 145° C. at 0.02 mbar; colorless).
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