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3,4-二氢吡喃、醇(酚)、磺化活性炭(附制备文献)和分子筛(3 A)于干燥二氯甲烷中室温反应,过滤后蒸去溶剂即
3,4-dihydropyran, alcohol (phenol), sulfonated activated carbon (with preparation literature) and molecular sieves (3A) in dry dichloromethane at room temperature, filtered and the solvent is evaporated