[H-].[Al+3].[Li+].[H-].[H-].[H-].C([O:10][C:11]1[C:26]([CH3:27])=[C:25]([CH3:28])[C:14]2[O:15][C:16]([CH2:20][C:21](OC)=[O:22])([CH3:19])[CH2:17][CH2:18][C:13]=2[C:12]=1[CH3:29])(=O)C.S([O-])([O-])(=O)=O.[Na+].[Na+]>CCOCC>[OH:10][C:11]1[C:26]([CH3:27])=[C:25]([CH3:28])[C:14]2[O:15][C:16]([CH2:20][CH2:21][OH:22])([CH3:19])[CH2:17][CH2:18][C:13]=2[C:12]=1[CH3:29]Lithium aluminum hydride (LAH) (8.0 g) was suspended in ether (500 ml). A solution of methyl 2-(6-acetoxy-2,5,7,8-tetramethyl-3,4-dihydro-2H-benzo[1,2-b]pyran-2-yl)acetate (12.16 g) in ether (200 ml) was added dropwise to the suspension. The mixture was stirred for 1 hour. A saturated aqueous solution of sodium sulfate was added dropwise to the reaction solution at room temperature to decompose excess LAH. The solution was filtered. The filtrate was evaporated to give the title compound (9.31 g) having the following physical data.
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