[Cl:1][C:2]([Cl:4])=[CH2:3].Cl[C:6]([CH3:13])([CH2:9][CH2:10][CH2:11][CH3:12])[CH2:7][CH3:8].Cl>[Fe](Cl)(Cl)Cl>[Cl:1][C:2]([Cl:4])=[CH:3][C:6]([CH2:7][CH3:8])([CH3:13])[CH2:9][CH2:10][CH2:11][CH3:12]1,235 g (12.7 moles) of 1,1-dichloroethene and 630 g (4.23 moles) of 3-chloro-3-methylheptane are taken at 20° C. 85 g of anhydrous iron(III) chloride are added in portions, while cooling. The mixture is then subsequently stirred at 30° C. for 2 hours. It is poured onto ice and dilute aqueous hydrochloric acid. The organic phase is separated off, dried and subjected to fractional distillation. 627 g (71% of theory) of 1,1-dichloro-3-ethyl-3-methyl-hept-1-ene are isolated at boiling point6.1 50°-60° C.
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