[OH-].[Na+].[CH3:3][C:4]1[C:5]([Se:18][C:19]2[CH:29]=[CH:28][C:22]([C:23]([O:25]CC)=[O:24])=[CH:21][CH:20]=2)=[CH:6][C:7]2[C:8]([CH3:17])([CH3:16])[CH2:9][CH2:10][C:11]([CH3:15])([CH3:14])[C:12]=2[CH:13]=1.CO.Cl>C1COCC1.C(OCC)C.O.O>[CH3:3][C:4]1[C:5]([Se:18][C:19]2[CH:20]=[CH:21][C:22]([C:23]([OH:25])=[O:24])=[CH:28][CH:29]=2)=[CH:6][C:7]2[C:8]([CH3:17])([CH3:16])[CH2:9][CH2:10][C:11]([CH3:14])([CH3:15])[C:12]=2[CH:13]=1Sodium hydroxide (450 mg, 11.25 mmol) is added to a solution of ethyl 4-(3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydro-2-naphthylselanyl)benzoate (450 mg, 1.04 mmol) in a mixture of 10 ml of THF, 1 ml of methanol and 1 ml of water. The reaction medium is refluxed for 12 h. It is then poured into an ethyl ether/water mixture, acidified to pH 1 with concentrated hydrochloric acid solution and extracted with ethyl ether. After separation of the phases by settling, the organic phase is washed twice with water, dried over anhydrous magnesium sulphate and concentrated on a rotary evaporator under vacuum at 40° C.
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