[C:1]([CH:6]([CH2:18][CH3:19])[CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][C:12]1[C:13](=[O:17])[CH2:14][CH2:15][CH:16]=1)([O:3][CH2:4][CH3:5])=[O:2].[CH2:20]([CH:22](C(OCC)=O)[C:23](OCC)=O)[CH3:21]>>[C:1]([CH:6]([C:18]1[CH:23]=[CH:22][CH:20]=[CH:21][CH:19]=1)[CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][C:12]1[C:13](=[O:17])[CH2:14][CH2:15][CH:16]=1)([O:3][CH2:4][CH3:5])=[O:2]This cyclopentenone is prepared by the procedure described in Belgium Pat. No. 786,215 (Jan. 15, 1973) for the preparation of 2-(6-carbethoxyoctyl)cyclopent-2-en-1-one by substituting diethyl phenylmalonate for diethyl ethylmalonate.
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