1-Methoxynaphthalene → 4-Methoxy-1-naphthaldehyde

Beteiligte Stoffe

Reaktionsschritte

Phosphorus oxychloride (315 g, 1.6 mole) was added dropwise over 4 hours to a stirred solution of 1-methoxynaphthalene (250 g) (2) in dried dimethylformamide (150 g). the reaction mixture was heated on a water bath for a further 4 hours, cooled, and poured onto ice (1 k) and 2M aqueous sodium acetate (1.5 l). The organic layer was extracted with dichloromethane (1 l) and washed with dilute hydrochloric acid and then with water. The organic layer was dried (MgSO4), filtered, and the solvent removed. 4-Methoxy-1-naphthaldehyde (3) was obtained as a pale yellow oil.

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