• Amides: one word R1-C(=O)NHR2
1) alkyl side chain = R2
2) long-alkyl root = R1-CO suffix -amide
e.g CH3CON(Et)H Þ N-ethylethanamide
• Acid chlorides two words. R1-C(=O)Cl
• long-alkyl root = R1 suffix –oyl chloride
e.g CH3C(=O)Cl Þ ethanoyl chloride