Tejas posted an Question
August 29, 2021 • 18:37 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Please explain the reaction ?

please explain the reaction ?........ .......... .........

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  • Suman Kumar best-answer

    In the pericyclic reaction the stereochemistry shown are relative stereochemistry not absolute. To explain the stereo chemistry of DA reaction think like that your dienophile comes under the diene to get orbitals in a right direction to overlap there and the stereo chemistry of the substituents are you can fix that outer substituents ( in my ans Phenyl group) are on the same side of the product. If in this approach we get wedge form the substituents but in the reality both diene and dienophile are planner so there is equal possibility that the dienophile comes above the diene. So we get Dash stereochemistry arround the phenyl substituents but both are Cis to each other

  • Suman Kumar Best Answer

    Please find the attachment for the answer written below.

    cropped7152518571074574865.jpg
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    can you explain stereochemistry in product..

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    if we show both phenyl on dash then what will be the stereochemistry of anhydride??

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    Stereochemistry of anhydride will be cis to the Groups attached on the diene

    eduncle-logo-app

    In the pericyclic reaction the stereochemistry shown are relative stereochemistry not absolute. To explain the stereo chemistry of DA reaction think like that your dienophile comes under the diene to get orbitals in a right direction to overlap there and the stereo chemistry of the substituents are you can fix that outer substituents ( in my ans Phenyl group) are on the same side of the product. If in this approach we get wedge form the substituents but in the reality both diene and dienophile are planner so there is equal possibility that the dienophile comes above the diene. So we get Dash stereochemistry arround the phenyl substituents but both are Cis to each other

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