### 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):** -

Reactios of dienes with HBr or Br2 gives 1,2 and 1,4 addition products .

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

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

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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