[CH2:1]([O:5][C:6]1[CH:13]=[CH:12][C:9]([CH:10]=[O:11])=[CH:8][C:7]=1[CH2:14]Cl)[CH2:2][CH2:3][CH3:4].[P:16]([O:23]CC)([O:20][CH2:21][CH3:22])[O:17][CH2:18][CH3:19]>>[CH2:18]([O:17][P:16]([CH2:14][C:7]1[CH:8]=[C:9]([CH:10]=[O:11])[CH:12]=[CH:13][C:6]=1[O:5][CH2:1][CH2:2][CH2:3][CH3:4])(=[O:23])[O:20][CH2:21][CH3:22])[CH3:19]4-Butoxy-3-chloromethylbenzaldehyde and triethyl phosphite in a 1:1 ratio were heated until no more gas evolved and the reaction mixture had turned light orange. The reaction mixture was then vacuum distilled to give the desired product. bp 188° C. at 1.4 mm Hg.
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