FC(F)(F)S(O[C:7]1[CH:8]=[C:9]([C:17]([O:19][CH3:20])=[O:18])[CH:10]=[C:11]([CH:16]=1)[C:12]([O:14][CH3:15])=[O:13])(=O)=O.OB(O)[C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1.C(N(CC)CC)C>CN(C)C=O>[C:25]1([C:7]2[CH:8]=[C:9]([C:17]([O:19][CH3:20])=[O:18])[CH:10]=[C:11]([CH:16]=2)[C:12]([O:14][CH3:15])=[O:13])[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1A mixture of dimethyl 5-(trifluoromethylsulfonyloxy)isophthalate (2.3 g), dihydroxy-phenylborane (1.23 g) and triethylamine (2.0 4 g) in N,N-dimethylformamide (30 ml) was heated at 100° C. and stirred for 3 hours under nitrogen. After evaporating the solvent, the residue was dissolved in a mixture of dichlomethane (100 ml) and water. The organic layer was successively washed with aqueous 10% sodium carbonate solution and brine, dried over magnesium sulfate and evaporated in vacuo. The residue was crystallized from hexane to afford dimethyl 5-phenylisophthalate (1.07 g).
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