Ammonia → 2-Amino-3-chlorobenzoic acid

Participants

Reaction Conditions

Reaction Steps

A solution comprising 191 parts of 2,3-dichlorobenzoic acid and 40 parts of NaOH prills in 500 parts of water, and 3 parts of CuCl are initially introduced into a 2 l V4A autoclave. 425 parts of liquid NH3 (d20 : 0.61) are then also forced in, and the autoclave is heated at 165° to 175° C. for 3 hours, during which the pressure drops from initially 50 bar to about 46 bar. When the reaction has ended, the contents of the autoclave are cooled to 25° C. and drained off over the ascending line. The reaction solution is boiled under reflux until a bottom temperature of 100° C. is reached, and the NH3 gas driven off is collected in a waste gas washer. Working up in accordance with Example 1 gives 168 parts (98% of theory) of 2-amino-3-chlorobenzoic acid of melting point 185° to 187 ° C.

Provenance & Evidence