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Cyclopropylbromide (3.84 g, 32 mmol) was added to magnesium (771 mg, 32 mmol) in 20 mL diethylether and refluxed for 10 min. Manganese(II) chloride (160 mg, 1.27 mmol) and butyl-[1-(2-fluoro-4,6-bis-trifluoromethyl-phenyl)-methylidene]-amine (intermediate M, 4 g, 13 mmol) was added. The reaction mixture was refluxed for 2 h. The reaction mixture was quenched with 8 mL water and filtered through dicalite. The organic phase was separated and dried on sodium sulfate, filtered and evaporated. The crude material, brown oil (3.54 g, 82%) was used without further purification.

1. temperaturerefluxed for 10 min
2. temperatureThe reaction mixture was refluxed for 2 h
3. customThe reaction mixture was quenched with 8 mL water
4. filtrationfiltered through dicalite
5. customThe organic phase was separated
6. customdried on sodium sulfate
7. filtrationfiltered
8. customevaporated
9. customThe crude material, brown oil (3.54 g, 82%) was used without further purification