Hydrochloric Acid → 1-Naphthalenecarboxaldehyde, 5,6,7,8-tetrahydro-4-hydroxy-

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Reaction Steps

5,6,7,8-Tetrahydro-naphthalen-1-ol (108, 20 g, 135 mmol) was stirred in 100 mL of ethanol, and potassium hydroxide (7.57 g, 135 mmol) as an aqueous solution was added. The mixture was stirred for 15 minutes and went clear. Solvents were removed and dried. PEG (MW 380-420, 53 mL) was added, followed by chloroform (32.3 mL, 405 mmol) and toluene (34 mL). An aqueous potassium hydroxide solution (50% by weight, 54.4 mL) was introduced dropwise with stirring over 15 minutes. The stirring was continued for another 30 minutes. 1M HCl was added to acidify the reaction mixture and it was extracted with EtOAc three times. The combined organic layers were washed with water and brine The combined organic layers were dried over MgSO4, filtered, concentrated, and purified by flash chromatography (0-40% EtOAc/hexane) to give 4-hydroxy-5,6,7,8-tetrahydro-naphthalene-1-carbaldehyde (109, 4.7 g).

Provenance & Evidence