[C:1]([C:3]1[CH:22]=[CH:21][C:6]([O:7][C:8]2[CH:20]=[CH:19][C:11]([C:12]([O:14]C(C)(C)C)=[O:13])=[CH:10][CH:9]=2)=[CH:5][CH:4]=1)#[N:2]>ClCCl.FC(F)(F)C(O)=O>[C:1]([C:3]1[CH:22]=[CH:21][C:6]([O:7][C:8]2[CH:20]=[CH:19][C:11]([C:12]([OH:14])=[O:13])=[CH:10][CH:9]=2)=[CH:5][CH:4]=1)#[N:2]The solution of tert-butyl 4-(4-cyanophenoxy)benzoate (80 mg, 0.27 mmol) in dichloromethane: trifluoroacetic acid (4:1, 3 mL) was stirred overnight at room temperature. The solvent was evaporated in vacuo to give 4-(4-cyanophenoxy)benzoic acid (45 mg, 70%). LRMS (M+H+) m/z: calcd 239.06. found 239.
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