Ethyl Acetate → 2,2'-Dibromo-5,5',6,6',7,7',8,8'-octahydro-1,1'-binaphthalene

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A 500 ml capacity stainless steel autoclave was charged with 35 g (0.085 mol) of 2,2'-dibromo-1,1'-binaphthyl, 5.25 g of 5%-ruthenium-carbon (manufactured by NECHEMCAT), 130 ml of ethyl acetate and 130 ml of 95% ethanol. After carrying out 20 hours of hydrogenation at a temperature of 100° C. under a hydrogen pressure of 50 kg/cm2, absorption of 4 mols of hydrogen per mol substrate was confirmed. The reaction mixture was cooled to 30° C. to remove the catalyst by filtration, the resulting filtrate was allowed to stand overnight at room temperature and then 30.6 g of the thus precipitated crystals were collected by filtration (yield, 85.7%).

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