[Cl-].[Al+3].[Cl-].[Cl-].[H-].[Al+3].[Li+].[H-].[H-].[H-].[CH2:11]([N:18]1[CH2:27][CH2:26][C:21]2([O:25][CH2:24][CH2:23][O:22]2)[CH2:20][CH2:19]1)[C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1.[OH-].[Na+]>CCOCC.O>[CH2:11]([N:18]1[CH2:19][CH2:20][CH:21]([O:22][CH2:23][CH2:24][OH:25])[CH2:26][CH2:27]1)[C:12]1[CH:13]=[CH:14][CH:15]=[CH:16][CH:17]=1106.8 g of (0.8 mole) of aluminum chloride were added to a 2 liter, 3-neck flask and then 800 ml of anhydrous ether were added thereto with strong cooling. The mixture was stirred for 30 minutes and then a suspension of 7.6 g (0.2 mole) of lithium aluminum hydride in 200 ml of ether was added thereto. The mixture was stirred for 30 minutes and then a solution of 93.2 g (0.4 mole) of 8-benzyl-1,4-dioxa-8-aza-spiro [4,5] decane in 400 ml of anhydrous ether was added thereto dropwise. After the addition, stirring was continued at room temperature for 2 hours and 1 liter of water was then slowly added with strong cooling. The mixture was made alkaline with 90 g of sodium hydroxide pellets and the ether phase was decanted off. The aqueous layer was extracted again with ether and the combined ether phases were dried and the ether removed by distillation. The residue was distilled to obtain 63 g (67% yield) of 2-[1-benzyl-4-piperidyloxy]-ethanol in the form of a clear oil boiling at 140° C at 0.1 mm Hg and having a refractive index nD20 = 1.633.
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