B(F)(F)F.[CH3:5][CH:6]([CH2:9][C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1)[CH2:7][Cl:8].B(F)(F)F.O.O.[C:22](Cl)([CH3:25])([CH3:24])[CH3:23]>O>[CH3:5][CH:6]([CH2:9][C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1)[CH2:7][Cl:8].[CH3:5][CH:6]([CH2:9][C:10]1[CH:15]=[CH:14][C:13]([C:22]([CH3:25])([CH3:24])[CH3:23])=[CH:12][CH:11]=1)[CH2:7][Cl:8]BF3 is passed for 30 minutes into a mixture of 84 parts by weight of 2-methyl-3-phenyl-propyl chloride and 50 ml of BF3.2H2O at room temperature. 56 parts by weight of tert.-butyl chloride are then added dropwise at room temperature. The mixture is refluxed for 4 hours and is then allowed to cool; the crude product is introduced into water and extracted with chloroform. The organic phase is separated off, washed with water, dried over Na2CO3 and distilled. 30 parts by weight of 2-methyl-3-phenyl-propyl chloride, boiling point 105° C./16 mm Hg, and 45 parts by weight of 2-methyl-3-(p-tert.-butylphenyl)-propyl chloride, boiling point 80°-81° C./0.02 mm Hg, are obtained.
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