Propylene → 3-Isopropyl-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 (30.0 g), xylene (5 ml) and phosphotungstic acid (1.5 g) was heated to 140° C. To the mixture was added propylene (8.9 g) slowly via a dry-ice condenser. GC analysis of the reaction mixture indicated that 98% conversion of the 5,5′,6,6′,7,7′,8,8′-octahydro-2,2′-binaphthol. Small amounts of isopropylated xylene were observed as well. The mixture was purified by flash column to give 14.5 g of 3-isopropyl-5,5′,6,6′,7,7′,8,8′-octahydro-2,2′-binaphthol, mp 110° C.; 3.7 g of 3,3′-diisopropyl-5,5′,6,6′,7,7′8,8′-octahydro-2,2′-binaphthol, mp 152–3° C.; and a mixture (15 g) containing 38% of 3-isopropyl-5,5′,6,6′,7,7′,8,8′-octahydro-2,2′-binaphthol and 33% of 3,3′-diisopropyl-5,5′,6,6′,7,7′8,8′-octahydro-2,2′-binaphthol.

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