Draw the major 1,2- and 1,4-addition products ormed when this diene reacts with HBr. Do not include any byproducts formed.

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**Title: Understanding 1,2- and 1,4-Addition Reactions in Dienes**

**Objective:**
Learn how to predict and draw the major 1,2- and 1,4-addition products formed when a diene reacts with HBr.

**Instructions:**

1. **Starting Material:**
   The image includes a six-membered cyclic diene. The structure is a cyclohexene ring with two double bonds.

2. **Reagent:**
   - HBr (Hydrogen bromide) in 1 equivalent is indicated as the reagent that will react with the diene.

3. **Reaction Pathways:**
   - Two main types of addition products are possible in reactions involving dienes:
     - **1,2-Addition**: The hydrogen from HBr adds to the carbon at one end of the double bond, while the bromine adds to the adjacent carbon.
     - **1,4-Addition**: The hydrogen adds to one end of the diene's first double bond, while the bromine adds to the other end of the conjugated diene system.

**Diagram Explanation:**
- The diene structure with its two double bonds is shown, ready for reaction.
- A vertical arrow points downwards from the diene to the products, indicating the progression of the reaction.
- The dashed outline at the bottom suggests the space where students are asked to draw the resulting addition products.

**Conclusion:**
Identify and draw the structures for both the 1,2-addition and 1,4-addition products that result when the given diene reacts with HBr, not considering any byproducts. This exercise enhances understanding of regioselectivity in electrophilic addition reactions of dienes.
Transcribed Image Text:**Title: Understanding 1,2- and 1,4-Addition Reactions in Dienes** **Objective:** Learn how to predict and draw the major 1,2- and 1,4-addition products formed when a diene reacts with HBr. **Instructions:** 1. **Starting Material:** The image includes a six-membered cyclic diene. The structure is a cyclohexene ring with two double bonds. 2. **Reagent:** - HBr (Hydrogen bromide) in 1 equivalent is indicated as the reagent that will react with the diene. 3. **Reaction Pathways:** - Two main types of addition products are possible in reactions involving dienes: - **1,2-Addition**: The hydrogen from HBr adds to the carbon at one end of the double bond, while the bromine adds to the adjacent carbon. - **1,4-Addition**: The hydrogen adds to one end of the diene's first double bond, while the bromine adds to the other end of the conjugated diene system. **Diagram Explanation:** - The diene structure with its two double bonds is shown, ready for reaction. - A vertical arrow points downwards from the diene to the products, indicating the progression of the reaction. - The dashed outline at the bottom suggests the space where students are asked to draw the resulting addition products. **Conclusion:** Identify and draw the structures for both the 1,2-addition and 1,4-addition products that result when the given diene reacts with HBr, not considering any byproducts. This exercise enhances understanding of regioselectivity in electrophilic addition reactions of dienes.
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