A

Amide

−CONH− (amide linkage) | RCONH₂ (primary), RCONHR' (secondary)
Quick Reference
Formula / Notation−CONH− (amide linkage) | RCONH₂ (primary), RCONHR' (secondary)
Also Known AsCarboxamide, Acid amide, Peptide bond (in proteins)

What is Amide?

An amide is an organic functional group or compound containing a carbonyl group (C=O) bonded to a nitrogen atom. Amides are formed by the reaction of carboxylic acids with amines, and are found in proteins (peptide bonds), nylon, and many pharmaceuticals. They are generally less reactive than other carbonyl compounds.

Formula & Notation

−CONH− (amide linkage) | RCONH₂ (primary), RCONHR' (secondary)

Other Names / Synonyms: Carboxamide, Acid amide, Peptide bond (in proteins)

Properties & Characteristics

Formed by reaction of carboxylic acid derivative (acyl chloride, anhydride, ester) with amine. Resonance between C=O and C−N gives partial double bond character — planar amide linkage, restricted rotation (cis/trans isomers possible). Stable to hydrolysis vs esters. Acidic hydrolysis: RCONH₂ + H₂O/H⁺ → RCOOH + NH₄⁺. Basic hydrolysis: RCONH₂ + NaOH → RCOONa + NH₃. Nylon formed by condensation of diamine + diacid (or from amino acid). Peptide bonds link amino acids in proteins.

Uses & Applications

Nylon polyamides (Nylon-6,6 from hexanediamine + adipic acid) for textiles, ropes, engineering plastics. Kevlar (para-aramid): bulletproof vests, high-strength composites. Urea (H₂NCONH₂): nitrogen fertilizer, urea-formaldehyde resins, protein metabolism product. Dimethylformamide (DMF): industrial solvent. Paracetamol (acetaminophen): analgesic containing amide group. β-Lactam antibiotics (penicillin, cephalosporin): cyclic amides. Drug design heavily uses amide bonds for metabolic stability.

Safety Information

Formamide and DMF are reproductive toxins (teratogenic) — avoid exposure during pregnancy. N,N-Dimethylformamide penetrates skin rapidly. Acrylamide (used in gel electrophoresis) is a neurotoxin and probable carcinogen — handle with gloves. Urea is relatively safe. β-Lactam antibiotics cause allergic reactions in sensitive individuals. Use PPE when handling amide solvents — check SDS for specific hazards.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Amide
Formula −CONH− (amide linkage) | RCONH₂ (primary), RCONHR' (secondary)
Synonyms Carboxamide, Acid amide, Peptide bond (in proteins)

Frequently Asked Questions

An amide is an organic functional group or compound containing a carbonyl group (C=O) bonded to a nitrogen atom. Amides are formed by the reaction of carboxylic acids with amines, and are found in proteins (peptide bonds), nylon, and many pharmaceuticals. They are generally less reactive than other carbonyl compounds.

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