Nucleophile Electrophile orbital interaction

Clearly, the above diagrams depict the interaction between empty orbital of electrophile with filled orbital of nucleophile. We may assume that the HOMO of nucleophile being more electronegative will have energy less than that of less electronegative electophile as above.

As on the diagram enter image description hereon page 111 on Organic chemistry by Clayden, it is stated that the empty orbitals of Nu are too high in energy to interact with the electrophile. But if the HOMO energy is higher than the vacant orbital of electrophile will the reaction not be feasable?

  • $\begingroup$ If the HOMO energy was higher than the vacant orbital of the electrophile, it would transfer those electrons to the electrophile. If electrons get a lower energy level that they can occupy, they will do so. $\endgroup$
    – S R Maiti
    Apr 29, 2021 at 17:23
  • $\begingroup$ Why is the electrophile lumo at a higher energy than nucleophile filled orbital? $\endgroup$ Aug 25, 2021 at 12:33
  • $\begingroup$ chemistry.stackexchange.com/questions/115150/… $\endgroup$ Aug 25, 2021 at 12:34


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