[F:1][C:2]1[CH:3]=[C:4]([C:8]2[CH:17]=[CH:16][C:15]3[C:10](=[CH:11][CH:12]=[C:13]([O:18][CH3:19])[CH:14]=3)[C:9]=2[O:20][C:21]2[CH:28]=[CH:27][C:24](C=O)=[CH:23][CH:22]=2)[CH:5]=[CH:6][CH:7]=1.OO.S(=O)(=O)(O)[OH:32]>C(OCC)(=O)C.O>[F:1][C:2]1[CH:3]=[C:4]([C:8]2[CH:17]=[CH:16][C:15]3[C:10](=[CH:11][CH:12]=[C:13]([O:18][CH3:19])[CH:14]=3)[C:9]=2[O:20][C:21]2[CH:22]=[CH:23][C:24]([OH:32])=[CH:27][CH:28]=2)[CH:5]=[CH:6][CH:7]=1Charge a 100 mL round-bottom flask with 4-[2-(3-fluoro-phenyl)-6-methoxy-naphthalen-1-yloxy]-benzaldehyde (2.5 g, 6.71 mmol) and ethyl acetate (5 mL). At room temperature add 2 mL of 35% hydrogen peroxide. To this solution slowly add 2 mL of concentrated sulfuric acid. The mixture warms to approximately 40° C. and returns to room temperature where it is stirred for 2 hours. Dilute the reaction with water and ethyl acetate (100 mL) and dry the organic layer over sodium sulfate, filter and concentrate in vacuo. Purify the crude product using radial chromatography eluting with CH2Cl2 to yield 540 mg (22%) of the title compound: mass spectrum (ion spray) m/z=359 (M−H).
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