2-Chlorobenzaldehyde → 4-Chloro-3-formylbenzenesulfonic acid

Participants

Reaction Conditions

Reaction Steps

2-chlorobenzaldehyde 500 g (3.35 moles) was added to 23% oleum 1050 g (1.35 moles), and the contents were cooled to 0 to 5° C. The reaction mixture was stirred for 2.5 hours between 0-15° C. To this stirred solution, 660 g of 65% oleum (2.41 moles) was added over a period of 2.5 hours, maintaining the temperature below 15° C. The reaction mass was stirred and allowed to come to a temperature of 25-30° C.

Provenance & Evidence