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Shweta Thakur posted an Question

January 10, 2021 • 16:14 pm

30 points

IIT JAM
Chemistry (CY)

Is meta claisen rearrangement is possible.

is meta claisen rearrangement is pogkckhdmh kdkhdkkhdkskzgjzjtztjzkbhssible.

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Priyanshu kumar Best Answer

Not possible...rather meta substituents affects the regioselectivity of reaction. Claisen rearrangement is [3,3] sigmatropic rearrangement
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sir m not getting
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meta pe substituents rehne se ye reaction possibilty ko change krte hai but 3,3 sigmatropic hai ye meta pe nahi aa payega na
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allyl group ke presence rhte hai...to first sigmatropic rearrangement hote hai to ortho pr jate hai...if ortho pe substituents phle se rehte hai then para pe jate hai
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sir
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ok
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got this?
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sir ye wrong hai n
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haa naming nhi hai thk...sigmatropic ke liye..saturated se unsaturated naming krte hai...so if double bond aise rahenge then naming oxygen se krne pe wrong hoga
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sir vase bhi oxygen pe double bond JB aayega tb carbon ki valency satisfy ni hogi
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haa ye bhi hai
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but Jo Aapne kha vo mujhe samagh ni aaya
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sigmatropic rearrangement me ye condition hai saturated se unsaturated naming karna rehta hai
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ok
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Dinesh khalmaniya 1

Not possible. only ortho and para possible. Actually here 3,3 sigmatropic rearrangement takes place and for this allylic group must be present so there is no possibility for allylic position on meta position
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sir m not getting
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check this
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after ortho rearrangement, there is not possibility of 3,3 rearrangement in meta position but it's possible for para
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why
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check the image which I've sent you. I've marked the reaaon
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ok
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ap check krke dekho ki meta pr 3,3- rearrangement possible he ya nhi... you will surely get your answer
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sir
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ok
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sir always 3 3 bond main hi claisen rearrangement possible hai
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sir
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yes, claisen rearrangement 3,3 hi hota he
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