S(=O)(=O)(O)O.[C:6]1([CH:12]2[CH2:16][CH2:15][NH:14][CH2:13]2)[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=1.[CH3:17][C:18](=[CH2:20])[CH3:19].O>C(Cl)(Cl)(Cl)Cl>[C:18]([C:9]1[CH:10]=[CH:11][C:6]([CH:12]2[CH2:16][CH2:15][NH:14][CH2:13]2)=[CH:7][CH:8]=1)([CH3:20])([CH3:19])[CH3:17]98 g (1 mole) of concentrated sulfuric acid were added dropwise to 29.4 g (0.2 mole) of 3-phenylpyrrolidine in 400 ml of carbon tetrachloride at 0°-5° C. After 15 minutes, 15.2 g (0.27 mole) of isobutylene were passed in gaseous form, the mixture was stirred for 1 hour at 0°-5° C. and hydrolysis was carried out with 400 ml of water at 20° C. The organic phase was separated off and the aqueous phase was extracted with twice 100 ml of dichloromethane. Working up of the organic phases gave 42 g of a crude product, which was fractionated under reduced pressure to give 13.4 g (33%) of a colorless oil of boiling point 84°-87° C./0.5 mbar.
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