[Cl:1][CH2:2][C:3](=[O:24])[CH:4]=P(C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.[CH:25](=O)[C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1>C1(C)C=CC=CC=1>[Cl:1][CH2:2][C:3](=[O:24])[CH:4]=[CH:25][C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1A mixture of 1-chloro-3-(triphenylphosphanylidene)-propane-2-one (2.8 g, 7.9 mmol) and freshly distilled benzaldehyde (0.7 g, 6.6 mmol) in toluene (10 ml) is heated at reflux for 20 hours. Evaporation to dryness yields a mixture containing the title compound that is used in the subsequent step without purification.
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