3-Ethylphenol → 3-Ethyl-1-hydroxy-5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphthalene

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Reaction Conditions

Reaction Steps

Next, 2,5-dimethyl-2,5-dichlorohexane (183 g, 1 mol) is stirred with 3-ethylphenol (146.4 g, 1.2 mol) and aluminum chloride (4 g) is added. The mixture is heated at 95° C., with stirring, for 1.5 hr, after which ethylene dichloride (100 ml) is added, and then the heating continued. After 1 hr, the mixture is cooled to 20° C., and poured onto an ice water/hydrochloric acid mixture (150 ml, 10% HCl solution). The mixture is then extracted with toluene (500 ml), the organic layer separated, washed with brine (3×50 ml) and dried (Na2SO4). The solvent is removed by distillation and the residue crystallized from a hexane/benzene solvent mixture to give 7-ethyl-1,1,4,4-tetramethyl-5-hydroxy-1,2,3,4-tetrahydronaphthalene.

Provenance & Evidence