carboxamide

Carboxamides are a significant class of amides, which are nitrogen-containing compounds derived from ammonia or amines. They are formed by replacing the hydroxyl group of a carboxylic acid with an amino group. Carboxamides (R'CONR₂) are generally neutral and, if they contain fewer than five carbon atoms, are soluble in water.

While simple covalent amides are not abundant in nature, polyamides, which are linked amides forming polymers, are abundant as proteins in living organisms. A well-known example is urea, also called carbamide, a key product of protein metabolism. Amides are characterized by their relative unreactivity, with hydrolysis being their most common reaction, converting them back to acids and amines. Some amides, like acetamide and dimethylformamide, are used as solvents, and others, such as the sulfa drugs and nylons, have important commercial applications. The amide bond is crucial for forming polypeptides and proteins.123