2-chloro-2,3-dimethylbutane

Conditions: temp:20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 20 g of anhydrous, powdered aluminum chloride are added in portions to 2,040 g (21 mols) of vinylidene chloride at -10° C., in a dry apparatus equipped with a drying tube. 837 g (7 mols) of 2-chloro-2,3-dimethylbutane are then added dropwise in the temperature range from 0° to 10° C. The mixture is allowed to warm up to 20° C., and further aluminum chloride portions (a maximum of 20 g) are added, while cooling, until the reaction is no longer exothermic. The mixture is stirred for a further 4 hours at room temperature, the catalyst is deactivated by dropwise addition of 70 ml of acetic acid, and the mixture is filtered over sodium sulphate. The volatile constituents are separated from the sparingly volatile constituents by continuous-feed distillation under 1 mbar. The distillate is fractionated in a column. 824 g (65% of theory) of 1,1-dichloro-3,3,4-trimethyl-pent-1-ene of boiling point 60°-75° C./20 mbar are obtained. ##STR19## equipped with a drying tube while cooling, until the reaction the mixture is filtered over sodium sulphate The volatile constituents are separated from the sparingly volatile constituents by continuous-feed distillation under 1 mbar