O-Phenylenediamine → 1-(4-methoxybenzyl)-2-(4-methoxyphenyl)-1H-benzo(d)imidazole

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In a methanol (5 mL) solvent in the presence of NH4Br (362.3 mg, 3.70 mmol), a solution including 1,2-phenylenediamine (100 mg, 0.92 mmol) and p-anisaldehyde (0.11 mL, 0.82 mmol) was stirred at room temperature for 6 hours, and methanol was evaporated therefrom. The residual was distributed between ethyl acetate and water. An organic layer was dried by using MgSO4, filtered, and evaporated. The residual was purified by silica gel column chromatography using hexane and ethyl acetate (3:1) to obtain a solid Compound 116.

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