[Cl:1][C:2]1[CH:3]=[C:4]([CH:14]=[C:15]([O:17][C:18]2[CH:23]=[C:22]([C:24]#[N:25])[CH:21]=[C:20]([Cl:26])[CH:19]=2)[CH:16]=1)[O:5][CH2:6][C:7]([O:9]C(C)(C)C)=[O:8].FC(F)(F)C(O)=O>>[Cl:1][C:2]1[CH:3]=[C:4]([CH:14]=[C:15]([O:17][C:18]2[CH:23]=[C:22]([C:24]#[N:25])[CH:21]=[C:20]([Cl:26])[CH:19]=2)[CH:16]=1)[O:5][CH2:6][C:7]([OH:9])=[O:8]221 mg (0.561 mmol) of tert-butyl [3-chloro-5-(3-chloro-5-cyanophenoxy)phenoxy]acetate (5-2) was treated with neat trifluoroacetic acid until an LC/MS analysis indicated that the reaction was complete. The reaction was concentrated in vacuo and no further purification was done on the resultant desired product 5-3 which was isolated as an oil. MS: M+1=338.
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