[CH2:1]=[CH:2][C:3](=[CH2:5])[CH3:4].[C:6]1([O:13][CH3:14])[C:7](=[CH:9][CH:10]=[CH:11][CH:12]=1)[OH:8].P(=O)(O)(O)O.O>C1(C)C(C)=CC=CC=1.C1C2NC3C(=CC=CC=3)SC=2C=CC=1>[CH3:4][C:3]1([CH3:5])[C:10]2[C:11](=[CH:12][C:6]([O:13][CH3:14])=[C:7]([OH:8])[CH:9]=2)[CH2:1][CH2:2]1449 g of isoprene, stabilized with 1.4 g of phenothiazine, were added dropwise over the course of 6 hours to a solution of 744 g of guaiacol, 76 g of 85% strength phosphoric acid and 6 ml of water in 1.4 liters of xylene at 110° C. To complete the reaction, stirring of the mixture was continued overnight at 110° C. The acid phase was separated off and extracted by shaking with toluene. The combined organic phases were washed until neutral. Fractional distillation gave 443 g of 3,3-dimethyl-5-hydroxy-6-methoxy-indane, boiling point: 145- 46° C/12 mm Hg, melting point 43.5° - 44.5° C. ##STR35##
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