Cl[CH2:2][C:3]1[CH:8]=[CH:7][C:6]([CH2:9]Cl)=[CH:5][C:4]=1[C:11]1[CH:16]=[C:15]([CH3:17])[CH:14]=[CH:13][C:12]=1[CH3:18].[P:19]([O:26]CC)([O:23][CH2:24][CH3:25])[O:20][CH2:21][CH3:22]>>[CH2:21]([O:20][P:19]([CH2:2][C:3]1[CH:8]=[CH:7][C:6]([CH2:9][P:19]([O:20][CH2:21][CH3:22])([O:23][CH2:24][CH3:25])=[O:26])=[CH:5][C:4]=1[C:11]1[CH:16]=[C:15]([CH3:17])[CH:14]=[CH:13][C:12]=1[CH3:18])(=[O:26])[O:23][CH2:24][CH3:25])[CH3:22]50 g (180 mmol) of 2′,5′-bis-chloromethyl-2,5-dimethylbiphenyl are heated at 160° C. in 63 ml (366 mmol) of triethyl phosphite until the evolution of gas is complete. The residue which remains is employed in the subsequent reaction without further purification.
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