[OH:1][C:2]1[CH:11]=[C:10]2[C:5]([CH:6]=[CH:7][C:8]([C:12]([O:14][CH2:15][CH3:16])=[O:13])=[CH:9]2)=[CH:4][CH:3]=1.C(=O)([O-])[O-].[K+].[K+].[CH2:23](Br)[CH:24]=[CH2:25]>[I-].[K+].CC(C)=O>[CH2:25]([O:1][C:2]1[CH:11]=[C:10]2[C:5]([CH:6]=[CH:7][C:8]([C:12]([O:14][CH2:15][CH3:16])=[O:13])=[CH:9]2)=[CH:4][CH:3]=1)[CH:24]=[CH2:23]A mixture of ethyl 7-hydroxynaphthalene-2-carboxylate (37.5 g), anhydrous potassium carbonate (24.0 g), potassium iodide (0.5 g), and allyl bromide (29.0 g) was heated in refluxing acetone (200 ml) with stirring for 15 hours. The mixture was filtered and the filtrate was evaporated. The residue was dissolved in ethyl-acetate, washed with 2% sodium hydroxide solution and water, dried and evaporated to give a solid. Crystallisation from petroleum ether (b.p. 40-60) afforded ethyl 7-allyloxynaphthalene-2-carboxylate (36 g), m.p. 60°-61°.
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