Water → 3,3,6,7-Tetramethyl-2,3-dihydro-1H-inden-5-ol

Participants

Reaction Steps

449 g of isoprene, stabilised with 1.3 g of phenothiazine, were added dropwise in the course of 7 hours to a solution of 732 g of 2,3-dimethyl-phenol, 76.5 g of 85% strength phosphoric acid and 6 ml of water in 1.44 liters of o-dichlorobenzene at 150° C. To complete the reaction, stirring of the mixture was continued overnight at 150° C. The acid phase was separated off and the organic phase was washed until neutral. Fractional distillation gave 526 g of 5-hydroxy-3,3,6,7-tetramethyl-indan; boiling point: 165°-167° C./15 mm Hg; melting point: 117°-118° C. ##STR7##

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