p-Toluenesulfonic acid → 2-(Benzyloxy)-3-tert-butyl-3'-(1-(2-methoxyphenyl)vinyl)biphenyl

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A solution of crude 37 (2.23 mmol) in toluene (80 mL) was treated with p-toluenesulfonic acid (100 mg) and refluxed under a Dean-Stark trap for 3 hr. After cooling, the reaction mixture was diluted with ethyl acetate (150 mL) and washed with saturated sodium bicarbonate (150 mL) and water (2×100 mL). The organic extract was dried over sodium sulfate and filtered. The solvent was removed in a rotary evaporator and the crude product was purified by chromatography on silica (75 g) with 2% ethyl acetate in heptane (4 L) to afford 38 (0.78 g, 78%).

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