[CH:1](=O)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Cl-:9].[Cl-:10].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>>[CH:1]([Cl:10])([Cl:9])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1Furthermore, it is known from Liebig's Annalen der Chemie, Volume 626, pages 26 to 34 (1959) to react benzaldehyde with triphenylphosphine dichloride to give benzal chloride, but the yield is only 59%. When cyclohexanone is reacted with triphenylphosphine dichloride in the presence of an equimolar amount of triethylamine it is not the corresponding geminal dihalide which is obtained but 1-chlorocyclohex-1-ene in 45% yield (loc. cit., page 33).
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