[CH2:1]=[CH:2][C:3](=[CH2:5])[CH3:4].[Cl:6][C:7]1[CH:8]=[C:9]([OH:13])[CH:10]=[CH:11][CH:12]=1.P(=O)(O)(O)O.O>ClC1C=CC=CC=1Cl.C1C2NC3C(=CC=CC=3)SC=2C=CC=1>[Cl:6][C:7]1[CH:8]=[C:9]([OH:13])[CH:10]=[C:11]2[C:12]=1[CH2:1][CH2:2][C:3]2([CH3:5])[CH3:4]449 g of isoprene, stabilized with 1.35 g of phenothiazine, were added dropwise over the course of 5.5 hours to a solution of 771 g of m-chlorophenol, 77 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 was continued overnight at 150° C. After cooling, the acid phase was separated off and extracted by shaking with toluene. The combined organic phases were washed until neutral. Fractional distillation gives 194 g of 7-chloro-3,3-dimethyl-5-hydroxy-indane; boiling point 105°-110° C/0.5 mm Hg; melting point 86.5° - 87.5° C. ##STR38##
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