Question:
When phenolic allyl ether are heated, produces 2-allyl phenols. This rearrangement is:
When phenolic allyl ether are heated, produces 2-allyl phenols. This rearrangement is:
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Claisen = Allyl group migration from Oxygen to Carbon.
Updated On: May 28, 2026
- Claisen rearrangement
- Fries rearrangement
- Riemer Timmen rearrangement
- Friedel Craft rearrangement
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The Correct Option is A
Solution and Explanation
Step 1: Concept
The Claisen rearrangement is a powerful carbon-carbon bond-forming chemical reaction.
Step 2: Meaning
It involves the [3,3]-sigmatropic rearrangement of an allyl vinyl ether or, in this specific case, an allyl phenyl ether upon heating.
Step 3: Analysis
When allyl phenyl ether is heated, the allyl group migrates from the oxygen to the ortho-position (2-position) of the phenyl ring. Fries rearrangement involves phenolic esters; Reimer-Tiemann is for formylation; Friedel-Crafts involves alkylation/acylation.
Step 4: Conclusion
The migration of an allyl group from oxygen to the ortho-carbon of phenol is the Claisen rearrangement.
Final Answer: (A)
The Claisen rearrangement is a powerful carbon-carbon bond-forming chemical reaction.
Step 2: Meaning
It involves the [3,3]-sigmatropic rearrangement of an allyl vinyl ether or, in this specific case, an allyl phenyl ether upon heating.
Step 3: Analysis
When allyl phenyl ether is heated, the allyl group migrates from the oxygen to the ortho-position (2-position) of the phenyl ring. Fries rearrangement involves phenolic esters; Reimer-Tiemann is for formylation; Friedel-Crafts involves alkylation/acylation.
Step 4: Conclusion
The migration of an allyl group from oxygen to the ortho-carbon of phenol is the Claisen rearrangement.
Final Answer: (A)
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