[OH:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[CH2:8][CH:7]([C:12]([OH:14])=[O:13])[CH2:6][CH2:5]2.[CH2:15](Br)[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1.[OH-].[K+].Cl>O.[I-].[Na+].C(O)C>[CH2:15]([O:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[CH2:8][CH:7]([C:12]([OH:14])=[O:13])[CH2:6][CH2:5]2)[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1A mixture of 10.60 g (50 mmol) of 1,2,3,4-tetrahydro-6-hydroxynaphthalene-2-carboxylic acid, 12.85 g (75 mmol) of benzyl bromide, 6.6 g (100 mmol) of 85% potassium hydroxide, 0.525 g (3.5 mmol) of sodium iodide, 200 ml of ethanol and 25 ml of distilled water was heated under reflux at 100° C. for 12 hours. To this reaction mixture was added 50 ml of 10% potassium hydroxide, followed by heating under reflux at that temperature for 2 hours. After allowing the reaction system to cool up to room temperature, the reaction mixture in cold water was acidified with 36% hydrochloric acid. The resulting deposited product was filtered, and recrystallized from toluene to obtain 13.08 g (46.4 mmol) of 1,2,3,4-tetrahydro-6-benzyloxynaphthalene-2-carboxylic acid.
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