Ethylene Glycol → 1-Bromo-3-(1,3-dioxolan-2-YL)-4-methoxybenzene

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To a stirred solution of 5-bromo-2-methoxybenzaldehyde (5.0 g, 23.25 mmol) in toluene (50 mL) was added ethylene glycol (2.6 mL, 46.5 mmol) and p-toluenesulfonic acid monohydrate (0.45 g, 2.32 mmol) and the reaction mixture was azeotroped for 2 h, quenched with sat. NaHCO3 (50 mL). Reaction mixture was concentrated under reduced pressure, extracted with ethyl acetate (2×100 mL), washed with water, brine, dried over sodium sulfate, concentrated and purified by silica gel column chromatography to furnish 2-(5-bromo-2-methoxy-phenyl)-[1,3]dioxolane (3.75 g).

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