Let's solve each part step by step, with explanations after each step, and the final answers at the end. --- ## **9.18 Provide systematic names for the compounds** ### **a. Structure: N(CH₂CH₃)₂ attached to a butane backbone** #### **Step 1:** Identify the backbone and substituents. - The backbone is butane (4 carbons). - There is a diethylamino group (N(CH₂CH₃)₂) on the second carbon. #### **Explanation:** The parent chain is butane, and the diethylamino group is attached to carbon 2. --- ### **b. Structure: Cyclohexane ring with a methyl and N-methylamino substituent** #### **Step 2:** Assign locants and names. - Cyclohexane ring is the parent. - Methyl group at carbon 1, N-methylamino group at carbon 2. #### **Explanation:** Start numbering at the methyl group, so the substituents are at carbons 1 and 2. --- ### **Final Answers for 9.18:** - **a.** 2-(Diethylamino)butane - **b.** 1-Methyl-2-(N-methylamino)cyclohexane --- ## **9.36 Predict the products of the following S_N1 reactions** ### **a. 3-Chloro-3-methylpentane + (CH₃)₂NH** #### **Step 1:** Carbocation formation - The leaving group (Cl⁻) leaves, forming a tertiary carbocation at C-3. #### **Step 2:** Nucleophilic attack - Dimethylamine ((CH₃)₂NH) attacks the carbocation, forming an amine product. #### **Explanation:** S_N1 proceeds via a carbocation intermediate, then nucleophile attacks. --- ### **b. 1-Bromo-1-phenylpropane + ethanol** #### **Step 1:** Carbocation formation - The leaving group (Br⁻) leaves, forming a benzylic carbocation (stabilized by the phenyl ring). #### **Step 2:** Nucleophilic attack - Ethanol attacks the carbocation, forming an ether after deprotonation. #### **Explanation:** Benzylic carbocation is stabilized, so S_N1 proceeds easily. --- ### **Final Answers for 9.36:** - **a.** 3-(Dimethylamino)-3-methylpentane - **b.** 1-Ethoxy-1-phenylpropane --- ## **9.44 Predict the mechanism for each reaction and draw the product(s)** Let's address a few examples: ### **a. 1-Butyl tosylate + KCN** #### **Step 1:** Mechanism - KCN is a strong nucleophile. S_N2 reaction. #### **Step 2:** Product - Nucleophile (CN⁻) replaces OTs, forming 1-cyanobutane. --- ### **b. 1-Butyl tosylate + NH₃** #### **Step 1:** Mechanism - NH₃ is a nucleophile. S_N2 reaction. #### **Step 2:** Product - Nucleophile (NH₃) replaces OTs, forming 1-butylamine. --- ### **Final Answers for 9.44 (a & b):** - **a.** S_N2; **Product:** 1-cyanobutane (butanenitrile) - **b.** S_N2; **Product:** 1-butylamine --- **If you want detailed mechanisms or the rest of 9.44, let me know!**