1 Reply Latest reply on Aug 5, 2017 11:21 AM by

    Between fluorine anc chlorine attached to vinylic carbon,Which has more  m effect?, Between fluorine anc chlorine attached to vinylic carbon,Which has more  m effect?

    Prem Prasoon
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      Between fluorine and chlorine which has greater +M effect when attached to vinyl group.

      The confusion is, thiophene has almost twice the resonance energy of furan which encourage to think chlorine has better +M.

      Now when we compare acidic strength of these two lewis acids BF3 and BCl3( latter on is stronger) it encourage to think fluorine has better +M effect than chlorine.

      Kindly help me out..