[Cl:1][C:2]1[CH:10]=[C:9]([Cl:11])[CH:8]=[C:7]2[C:3]=1[CH2:4][CH:5]([CH3:13])[C:6]2=O.C1COCC1.CO.[BH4-].[Na+]>O>[Cl:11][C:9]1[CH:8]=[C:7]2[C:3](=[C:2]([Cl:1])[CH:10]=1)[CH2:4][C:5]([CH3:13])=[CH:6]2To a solution of 29.3 g (0.136 mol) of 4,6-dichloro-2-methylindan-1-one in 370 ml of a mixture of THF-methanol (2:1, vol.), 11.8 g (0.312 mol) of NaBH4 was added in small portions, while vigorously stirring, over 2 h at 0° C. This mixture was stirred for 12 h at room temperature and then added to 1000 ml of cold water. The organic layer was separated, the aqueous layer was extracted with 3×300 ml of methyl-tert-butyl ether. The combined organic fractions were dried over K2CO3 and then evaporated to dryness. The residue was dissolved in 700 ml of toluene, and 2.0 g of p-TosOH was added. The resulting solution was refluxed for 4 h using a Dean-Stark trap to remove the water formed, and then it was passed through a short Silica Gel 60 column (40-63 um, d 100 mm, l 80 mm, eluent: hexanes). This column was additionally washed with 250 ml of toluene. The combined organic fractions were evaporated to dryness. The product was isolated by flash chromatography on Silica Gel 60 (40-63 um, d 60 mm, l 150 mm). Yield 24.6 g (91%).
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