Chapter 9 / 9.3 Nomenclature

• Common vs IUPAC names: ethylamine → ethanamine 🏷️:contentReference[oaicite:0]{index=0}
• Use of N-locant for groups on nitrogen: N-methylethanamine ✏️:contentReference[oaicite:1]{index=1}
• Numbering when several –NH₂ groups appear: ethane-1,2-diam​ine 🔢:contentReference[oaicite:2]{index=2}
• Aromatic amines: aniline = benzenamine 🛑➡️🧪:contentReference[oaicite:3]{index=3}

📝 1. Classifying Amines

Replace one, two, or three hydrogen atoms in ammonia ($\text{NH}_3$) with alkyl or aryl groups ($\text{R}$ or $\text{Ar}$) and you get primary (1°), secondary (2°), or tertiary (3°) amines. Simple amines have identical groups; mixed amines don’t. 😎:contentReference[oaicite:4]{index=4}

🧭 2. Common (Trivial) Naming Rules

Aliphatic amines are named in one word: alkyl + amine. Example: methylamine for $\text{CH}_3\text{NH}_2$. If two or three identical groups hug the same nitrogen, pop di- or tri- in front: trimethylamine. 🚀:contentReference[oaicite:5]{index=5}

📚 3. IUPAC Naming Made Easy

1. Primary amines: swap the final “e” in the parent alkane for “amine”. Example: $\text{CH}_3\text{NH}_2$ → methanamine. ✨:contentReference[oaicite:6]{index=6}
2. Got extra –NH₂ groups? Number their carbons and keep the “e”: $\text{H}_2\text{N–CH}_2\text{–CH}_2\text{–NH}_2$ → ethane-1,2-diam​ine. 🔢:contentReference[oaicite:7]{index=7}
3. Secondary & tertiary amines: show side chains on nitrogen with the locant N. $\text{CH}_3\text{NHCH}_2\text{CH}_3$ → N-methylethanamine $(\text{CH}_3\text{CH}_2)_3\text{N}$ → N,N-diethylethanamine. 🎯:contentReference[oaicite:8]{index=8}

🌸 4. Aromatic Amines

When –NH₂ sticks straight on a benzene ring, the simplest case is aniline ($\text{C}_6\text{H}_5\text{NH}_2$). IUPAC says: replace “e” in benzene with “amine” → benzenamine. 🌼:contentReference[oaicite:9]{index=9}

📊 5. Handy Name Converter Table

📐 Practice swapping names back and forth—super skill for quick MCQ wins! 💪:contentReference[oaicite:10]{index=10}