[F:1][C:2]([F:15])([F:14])[S:3]([O:6]S(C(F)(F)F)(=O)=O)(=[O:5])=[O:4].O[C:17]1[CH:22]=[CH:21][C:20]([C:23]2[CH:28]=[CH:27][CH:26]=[C:25]([CH2:29][O:30][C:31]3[CH:38]=[CH:37][C:34]([CH:35]=[O:36])=[CH:33][CH:32]=3)[C:24]=2[CH3:39])=[C:19]([CH3:40])[CH:18]=1.N1C=CC=CC=1>ClCCl>[F:1][C:2]([F:15])([F:14])[S:3]([O:6][C:17]1[CH:22]=[CH:21][C:20]([C:23]2[CH:28]=[CH:27][CH:26]=[C:25]([CH2:29][O:30][C:31]3[CH:32]=[CH:33][C:34]([CH:35]=[O:36])=[CH:37][CH:38]=3)[C:24]=2[CH3:39])=[C:19]([CH3:40])[CH:18]=1)(=[O:5])=[O:4]Trifluoromethanesulfonic anhydride was dropwise added under ice-cooling to a mixture of 4-[(4′-hydroxy-2,2′-dimethylbiphenyl-3-yl)methoxy]benzaldehyde, pyridine and dichloromethane; followed by stirring at 0° C. for 1 hour to obtain 3′-[(4-formylphenoxy)methyl]-2,2′-dimethylbiphenyl-4-yl trifluoromethanesulfonate.
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