1,4-Dichlorobenzene → 3,3'-Diisopropyl-5,5',6,6',7,7',8,8'-octahydro-2,2'-binaphthol

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A mixture of 5,5′,6,6′,7,7′,8,8′-octahydro-2,2′-binaphthol (44.0 g), dichlorobenzene (10 ml) and phosphotungstic acid (2.3 g) was heated to 130° C. To the mixture was added excess propylene via a dry-ice condenser. The reaction was monitored by GC analysis. The reaction mixture contained 6% of monoisopropylated product and 83% of diisopropylated product. The mixture was purified by flash column to give 20.0 g of 3,3′-diisopropyl-5,5′,6,6′,7,7′,8,8′-octahydro-2,2′-binaphthol.

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