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Magazine Chapter 14: Problem 55
Aldrin, a chlorinated insecticide now banned from use in the United States, can be made by Diels-Alder reaction of hexachloro-1,3-cyclopentadiene with norbornadiene. What is the structure of aldrin?
Short Answer
Expert verified
Aldrin is formed by a Diels-Alder reaction creating a hexachloro-bicyclic structure.
Step by step solution
01
Understand the Diels-Alder Reaction
The Diels-Alder reaction is a chemical reaction between a conjugated diene and a dienophile. It forms a cyclohexene derivative, which is six-membered ring structure. Here, hexachloro-1,3-cyclopentadiene acts as the diene, and norbornadiene acts as the dienophile.
02
Examine the Reactants
Hexachloro-1,3-cyclopentadiene has six chlorine atoms attached to a five-carbon ring. Norbornadiene is a bicyclic molecule with alternating double bonds. When you visualize these structures, the diene needs to pair with the dienophile to form new carbon-carbon bonds, expanding into a hexagonal ring.
03
Identify the Product Formation
In the Diels-Alder reaction, the diene's two double bonds react with a single double bond of the dienophile. Norbornadiene provides the single double bond. During the reaction, the double bonds rearrange to form a six-membered ring, merging the two structures into one.
04
Draw the Aldrin Structure
The final structure of aldrin consists of a bicyclic system where the cyclopentadiene and norbornadiene are joined. The hexachloro-component retains all six chlorine atoms. Aldrin has a unique structure where chlorine atoms are positioned around the cyclic system: a chlorine-laden polycyclic compound.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Conjugated Diene
A conjugated diene is a chemical compound that features two double bonds separated by a single bond. This arrangement allows for electron delocalization, which stabilizes the molecule. In the Diels-Alder reaction, a conjugated diene is one of the two starting materials.
- The presence of conjugated double bonds in such compounds enhances their reactivity due to the overlapping p-orbitals.
- This type of electron arrangement results in an increased ability to form bonds with other reactive molecules like dienophiles.
- A common example is 1,3-butadiene, but in the case of aldrin synthesis, hexachloro-1,3-cyclopentadiene serves as the conjugated diene.
Dienophile
A dienophile is a chemical species that readily reacts with a diene in the Diels-Alder reaction. The term "dienophile" literally means "diene-loving." This is because dienophiles act as electron-deficient counterparts that attract the electron-rich dienes.
- In the Diels-Alder reaction, the dienophile typically contains one or more electron-withdrawing groups that make it more reactive with dienes. These groups help stabilize the transition state, leading to cycloaddition.
- Norbornadiene is a classic example of a dienophile, especially in the context of forming aldrin.
- The pi-bond within the dienophile, like the one present in norbornadiene, participates directly in forming the new cyclic bond structure with the diene.
Hexachloro-1,3-cyclopentadiene
Hexachloro-1,3-cyclopentadiene is an organochlorine compound used in the synthesis of insecticide aldrin through a Diels-Alder reaction. It acts as the diene in this process, characterized by its heavily chlorinated structure.
- This compound possesses a five-membered carbon ring with six chlorine atoms, making it very electron-rich and reactive.
- The chlorines add to its stability and influence its reactivity, allowing it to easily engage in the Diels-Alder reaction with dienophiles such as norbornadiene.
- The dense chlorine configuration around the structure also plays a significant role in maintaining the identity of the product, embedding its unique chemical properties.
Norbornadiene
Norbornadiene is a bicyclic compound known for its role as a dienophile in the synthesis of complex ring systems via the Diels-Alder reaction. It features two double bonds set within a rigid bicyclic framework, allowing for efficient cycloaddition.
- This molecule's structural properties make it particularly reactive as a dienophile, meaning it can easily react with a diene such as hexachloro-1,3-cyclopentadiene in our context.
- The bicyclic nature reflects its ability to introduce structural complexity, beneficial when synthesizing compounds like aldrin.
- Its double bonds are the reactive sites, crucial for forming new bonds during the reaction.
Cyclohexene Derivative
In the Diels-Alder reaction, the product formed is often a cyclohexene derivative. This type of compound arises from the cycloaddition involving a diene and a dienophile, creating a six-membered ring structure.
- The cyclohexene derivative represents the fundamental structure in which the original reactant molecules are combined and transformed.
- In the case of aldrin formation, the reaction between hexachloro-1,3-cyclopentadiene and norbornadiene results in a complex derived structure.
- This product preserves the multiple chlorine atoms from the diene, illustrating the Diels-Alder capability of maintaining specific substituents, which can be crucial for the biological or chemical properties of the material.
