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Friedel-Crafts acylation - Chemistry, Class 11 Video Lecture
FAQs on Friedel-Crafts acylation - Chemistry, Class 11 Video Lecture
| 1. What is Friedel-Crafts acylation? |  |
Ans. Friedel-Crafts acylation is a chemical reaction that involves the acylation of aromatic compounds using an acyl chloride or an acid anhydride as the acylating agent. This reaction is catalyzed by a Lewis acid, typically aluminum chloride (AlCl3), and results in the introduction of an acyl group (-C=O) onto the aromatic ring.
| 2. What are the reagents used in Friedel-Crafts acylation? | |
Ans. The reagents used in Friedel-Crafts acylation are an acyl chloride or an acid anhydride as the acylating agent, and a Lewis acid catalyst such as aluminum chloride (AlCl3). The Lewis acid catalyst helps in activating the acylating agent and facilitating the reaction with the aromatic compound.
| 3. What are the limitations of Friedel-Crafts acylation? | |
Ans. Friedel-Crafts acylation has some limitations. Firstly, it cannot be used with aromatic compounds that have electron-withdrawing groups already present on the ring, as these groups deactivate the ring towards electrophilic substitution. Additionally, the reaction may lead to the formation of multiple acylated products due to the possibility of multiple acylation events. Lastly, Friedel-Crafts acylation is not suitable for the acylation of highly deactivated aromatic compounds.
| 4. How can side reactions be minimized in Friedel-Crafts acylation? | |
Ans. To minimize side reactions in Friedel-Crafts acylation, several precautions can be taken. One approach is to carefully control the reaction temperature to prevent excessive heat generation, which can lead to undesirable side reactions. Additionally, controlling the stoichiometry of the reagents and the reaction time can help reduce the formation of unwanted by-products. Lastly, choosing the appropriate solvent and reaction conditions can also minimize side reactions.
| 5. What are the applications of Friedel-Crafts acylation? | |
Ans. Friedel-Crafts acylation finds various applications in organic synthesis. It is commonly used to introduce acyl groups onto aromatic rings, allowing the synthesis of a wide range of aromatic ketones. These ketones can serve as important intermediates in the production of pharmaceuticals, fragrances, and other fine chemicals. Additionally, Friedel-Crafts acylation can be used in the synthesis of natural products and dyes.
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Dec 02, 2024 Last updated |
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