Sulfuric Acid → o-Phenoxybenzaldehyde

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At room temperature, under an argon atmosphere, n-butyllithium (15.45 mL of a 2.5M solution in hexanes, 38.61 mmol) was added to a solution of diphenyl ether (5.0 g; 29.38 mmol) in 100 mL of ether, and the reaction mixture was gently refluxed for 4 hrs. After cooling to 0° C., N,N-dimethylformamide (22.73 mL; 0.293 mol) was added dropwise and the reaction was stirred for 15 min at 0° C. and 1.5 hr at room temperature. After adding 10% H2SO4 to pH 1, it was stirred for 15 min and extracted into ethyl acetate. Chromatography of the crude product (10% ethyl acetate/hexane) provided 4.0 g (69%) of the aldehyde, 1H NMR (CDCl3): δ 6.97 (d, 1H); 7.02-7.11 (m, 2H); 7.18-7.22 (m, 2H); 7.29 (t, 1H); 7.39 (t, 1H); 7.43 (t, 1H); 7.95 (t, 1H).

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