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39.1 g (0.20 mol) of 4-ethoxyphenylacetyl chloride in 200 ml of dichloromethane were added dropwise in the course of 1 hour at −78° C. to 53.4 g (0.4 mol) of aluminum chloride in 800 ml of dichloromethane. A vigorous stream of ethylene was subsequently passed in in the course of 15 minutes, and the mixture was allowed to come to room temperature and stirred for a further 3 hours. The dark red solution was cooled to 0° C. and carefully treated with 300 ml of ice-water. After phase separation, the organic phase was washed with 2N HCl (3×) and saturated sodium hydrogen carbonate solution, dried and evaporated on a rotary evaporator. After purification by column chromatography with petroleum ether/ethyl acetate (9:1, 8:2), 20.9 g (56% of theory) of a yellow syrup were obtained.

1. customwas subsequently passed in in the course of 15 minutes
2. customto come to room temperature
3. customAfter phase separation
4. washthe organic phase was washed with 2N HCl (3×) and saturated sodium hydrogen carbonate solution
5. customdried
6. customevaporated on a rotary evaporator
7. customAfter purification by column chromatography with petroleum ether/ethyl acetate (9:1, 8:2), 20.9 g (56% of theory) of a yellow syrup
8. customwere obtained