7. For the following reactions of dienes, please draw the 1,2-product and the 1,4-product. Also, please choose one reaction to draw the reaction mechanisms highlighting how both addition products are formed. 1. H3C. ? + ? 1,2-Product 1,4-Product HBr (1 eq) 2. ? ? + Br2 (1 eq.) - 1,2-Product 1,4-Product 3. ? + ? 1,2-Product 1,4-Product + HBr (1 eq.) 4. CH2 ? ? + Br2 CH2 (1 eq) 1,2-Product 1,4-Product

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### Diene Addition Reactions

**Exercise:**

7. For the following reactions of dienes, please draw the 1,2-product and the 1,4-product. Additionally, select one reaction to illustrate the reaction mechanisms, highlighting how both addition products are formed.

**Reactions:**

1.  
   \[
   \chemfig{H_3C-[1]-[2]HCR-[1]-[?]-|H_3} \quad 
   \longrightarrow \quad (1,2-\text{Product}) \quad + \quad (1,4-\text{Product})
   \]

2.  
   \[
   \chemfig{*6\erase\polycycle} \quad + \quad \ce{Br2 (1 eq.)} 
   \quad \longrightarrow \quad (1,2-\text{Product}) \quad + \quad (1,4-\text{Product})
   \]

3.  
   \[
   \chemfig{*6\polycycle} \quad + \quad \ce{HBr (1 eq.)} 
   \quad \longrightarrow \quad (1,2-\text{Product}) \quad + \quad (1,4-\text{Product})
   \]

4.  
   \[
   \chemfig{*\chain\HIT\polycycle} \quad + \quad \ce{Br2 (1 eq.)} 
   \quad \longrightarrow \quad (1,2-\text{Product}) \quad + \quad (1,4-\text{Product})
   \]

### Detailed Reaction Mechanism

**Example Reaction Mechanism: 1,3-Butadiene with HBr**

**Step 1: Formation of Allylic Carbocation**
1. **Initial Electrophilic Attack:** 
   - The diene reacts with HBr.
   - The double bond attacks the hydrogen leading to a carbocation intermediate.

2. **Resonance Stabilization:**
   - The intermediate can shift to form an allylic carbocation, allowing for resonance stabilization.

**Step 2: Formation of Products**
1. **1,2-Addition Product (Direct Addition to Adjacent Carbon):**
   - The bromide ion attacks the carbocation directly adjacent to where the proton added.

2. **1,4-Addition Product (Addition Across the Diene):**
   -
Transcribed Image Text:### Diene Addition Reactions **Exercise:** 7. For the following reactions of dienes, please draw the 1,2-product and the 1,4-product. Additionally, select one reaction to illustrate the reaction mechanisms, highlighting how both addition products are formed. **Reactions:** 1. \[ \chemfig{H_3C-[1]-[2]HCR-[1]-[?]-|H_3} \quad \longrightarrow \quad (1,2-\text{Product}) \quad + \quad (1,4-\text{Product}) \] 2. \[ \chemfig{*6\erase\polycycle} \quad + \quad \ce{Br2 (1 eq.)} \quad \longrightarrow \quad (1,2-\text{Product}) \quad + \quad (1,4-\text{Product}) \] 3. \[ \chemfig{*6\polycycle} \quad + \quad \ce{HBr (1 eq.)} \quad \longrightarrow \quad (1,2-\text{Product}) \quad + \quad (1,4-\text{Product}) \] 4. \[ \chemfig{*\chain\HIT\polycycle} \quad + \quad \ce{Br2 (1 eq.)} \quad \longrightarrow \quad (1,2-\text{Product}) \quad + \quad (1,4-\text{Product}) \] ### Detailed Reaction Mechanism **Example Reaction Mechanism: 1,3-Butadiene with HBr** **Step 1: Formation of Allylic Carbocation** 1. **Initial Electrophilic Attack:** - The diene reacts with HBr. - The double bond attacks the hydrogen leading to a carbocation intermediate. 2. **Resonance Stabilization:** - The intermediate can shift to form an allylic carbocation, allowing for resonance stabilization. **Step 2: Formation of Products** 1. **1,2-Addition Product (Direct Addition to Adjacent Carbon):** - The bromide ion attacks the carbocation directly adjacent to where the proton added. 2. **1,4-Addition Product (Addition Across the Diene):** -
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