C=O.O=[C:4]([CH:10]([C:16]1[CH:21]=[CH:20][CH:19]=[C:18]([Cl:22])[CH:17]=1)[C:11]([O:13][CH2:14][CH3:15])=[O:12])C(OCC)=O>>[Cl:22][C:18]1[CH:17]=[C:16]([C:10](=[CH2:4])[C:11]([O:13][CH2:14][CH3:15])=[O:12])[CH:21]=[CH:20][CH:19]=1This compound is prepared according to the method of Klioze and Ehrgott (U.S. Pat. No. 4,216,218) from formaldehyde and diethyl 2-oxo-3-(3-chlorophenyl)succinate (Example 26, Part A).
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