Shristy posted an Question
July 22, 2020 • 23:23 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Why this compound is anti aromatic.....i think it doesn't have regular conjugation

Why this compound is anti aromatic.....I think it doesn't have regular conjugation

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  • Suman Kumar

    Yes Shristy as it is five membered so it has no choice but to participate in conjugation. Cyclooctatetraene is 8 membered ring so it has flexibility so it becomes non planar

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    Priyanshu kumar

    shristy here conjugation is pi bond - empty p orbital - pi bond

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    so 4 pi electrons...Anti aromatic

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    got this??

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    any doubt shristy you can ask

  • Suman Kumar Best Answer

    It is anti aromatic. As it has only 4 pi eletron. Boron has only 3 valence electron. So Boron is sp2 hybridized. Vacant p orbital is there.

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    means due to vacant p orbital it takes part in conjugation ?

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    Yes Shristy as it is five membered so it has no choice but to participate in conjugation. Cyclooctatetraene is 8 membered ring so it has flexibility so it becomes non planar

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    Hope you got this Shristy

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    Dinesh khalmaniya 1 best-answer

    because Boron doesn't have lp in p orbital so over molecule have 4n pi electrons

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    it's follow every rule to be aromatic such as planar ,cyclic, conjunction. but doesn't have 4n+pi electron. it contains 4n pi electrons so it is antiaromatic

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    got it?

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