1-chloro-2-(dichloromethyl)benzene

Conditions: temp:120.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 195.3 g (1.0 mol) of 2-chlorobenza1 chloride are initially charged at 120° C. At this temperature 20 ml (21.8 g, 1.09 mol of water) of a 10% strength aqueous zinc chloride solution are metered in over a period of 5 hours. The mixture is stirred for a further 30 minutes at 120° C. After cooling to room temperature the reaction mixture is extracted with 1×10 ml and 2×5 ml of water. The organic phase is subsequently free of chloride and is worked up by distillation. 136.0 g (97% of theoretical) of 2-chlorobenzaldehyde (b.p.: 90° C./16 torr) with a purity of >99.9% are obtained. The combined aqueous phases (20 ml, 22.0 g) are used in Example 2 as catalyst solution. are metered in over a period of 5 hours After cooling to room temperature the reaction mixture is extracted with 1×10 ml and 2×5 ml of water is worked up by distillation