Answer :
Using anhydrous diethyl ether in reactions with Grignard reagents provides protective vapor barriers against O₂, stabilizes the Grignard reagent, and coordinates ether molecules to the Grignard reagent forming stable complexes. Therefore, the correct answer is option D. All of the above.
To understand why we use anhydrous diethyl ether in reactions involving Grignard reagents, consider the following reasons:
- A. Since Grignard reagents react with O₂ to form hydroperoxides, vapors from highly volatile diethyl ether solvent prevent O₂ from reaching the reaction mixture.
- B. Ether molecules coordinate with the Grignard reagent. This is crucial as ether molecules can donate lone pair electrons to the magnesium in the Grignard reagent, forming a stable complex.
- C. Ether helps stabilize the Grignard reagent. The solvent is essential because it stabilizes the Grignard reagent, increasing its ability to react.
Thus, the correct answer is D. All of the above.
Complete question.
Why do we use anhydrous diethyl ether? Choose the right answer.
A. Since Grignard reagents react with O₂ to form hydroperoxides, vapors from highly volatile diethyl ether solvent prevents O₂ from reaching the reaction mixture.
B. Ether molecules coordinate with grignard Reagent
C. Ether helps stabilize the Grignard reagent.
D. All of the above
We use anhydrous diethyl ether since Grignard reagents react with O2 to form hydroperoxides, vapors from highly volatile diethyl ether solvent prevents O2 from reaching the reaction mixture. Option A is the correct answer.
Anhydrous diethyl ether is commonly used as a solvent in Grignard reactions. The main reason for using anhydrous diethyl ether is to prevent the Grignard reagent from reacting with moisture or oxygen in the air, which would lead to unwanted side reactions or a reduction in the yield of the desired product.
Diethyl ether is highly volatile, and its vapors help to exclude oxygen from the reaction mixture, preventing the formation of hydroperoxides. Additionally, diethyl ether helps to dissolve the reactants and stabilize the Grignard reagent, making it more reactive towards the substrate. Hence option A is correct.
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