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Sourav posted an Question
August 14, 2020 • 22:03 pm 30 points
  • IIT JAM
  • Chemistry (CY)

However, when a hydroxy substituent is present in the substrate in proximity to the double bond, the zinc coordinates with the hydroxy substituent, directing cy

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  • Suman Kumar best-answer

    See the stereochemisty

    cropped874488745273579808.jpg
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    http://www.chemtube3d.com/Cyclopropanation.html

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    In reactant -OH is in dash & in product also -CH2 is in dash position. -OH group direct the incoming group due to chelation. Click the above link

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    but why hydrogen atoms have opposite position.

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    agar ek dash hai to remaining wedge me jayega na

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    Sourav

    i didn't understand sir. i could not understand also the diagram

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    Dinesh khalmaniya 1 Best Answer

    in simmon smith carbene, Zn show H bonding with polar group such as OH, OR so cyclopropanatin takes place according to stereochemistry of polar group

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    any doubt?

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    i couldn't understand it sir.

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    wait.. I'm sending pics

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    sorry image uploading was not working.check the image

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    in this case Zn is attached with OH group due to H bonding. so attack takes place towards polar group

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    now got it??

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