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In organic chemistry, an amide , also known as an organic amide or a carboxamide, is a compound with the general formula RCNR′R″, where R, R', and R″ represent organic groups or hydrogen atoms. The amide group is called a peptide bond when it is part of the main chain of a protein, and an isopeptide bond when it occurs in a side chain, such as in the amino acids asparagine and glutamine. It can be viewed as a derivative of a carboxylic acid RCOH with the hydroxyl group –OH replaced by an amine group −NR′R″; or, equivalently, an acyl group RC− joined to an amine group.
Common examples of amides are acetamide H3C−CONH2, benzamide C6H5−CONH2, and dimethylformamide HCON2.
Amides are qualified as primary, secondary, and tertiary according to whether the amine subgroup has the form −NH2, −NHR, or −NRR', where R and R' are groups other than hydrogen.
The core −CN= of amides is called the amide group.