Ethanolamine → N-(2-Hydroxyethylamino)-ethanesulfonic acid

Participants

Reaction Steps

A solution in 2 liters of water of 315 g of sodium bromoethanesulphonate (Organic Synthesis, Coll. Vol. II, p. 558) and 450 g of ethanolamine was heated to 60°-70° C. for 30 minutes. Excess ethanolamine and water were then distilled off under vacuum, and the residue dissolved in 250-270 ml of water. 2.2 Liters of concentrated hydrochloric acid was added and the solution kept in a refrigerator for 15-20 hours. The precipitated sodium chloride was filtered off using a filter pump, and the solution concentrated until a viscous oil was obtained. The oil was diluted with 60 ml of water and ethanol (about 500 ml) then added to precipitate the reaction product. After the mixture has been left one night in a refrigerator, precipitation was almost complete. The product obtained was filtered off with a filter pump. About 130-140 g of crystalline product was obtained, having a melting point of 180°-183° C.

Provenance & Evidence