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Other derivatives like thiophene, pyrrole give electrophilic substitution but why not selenophene? Is it because selenophene does not have enough electron donating effect and not having its electrons in conjugation, making the ring anti-aromatic?

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The Se atom has such diffuse valence orbitals compared with carbon that there is not good pi overlap, so we don't really have a conjugated cycle. By definition when there isn't a conjugated cycle, it's non-aromatic, not anti-aromatic.

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    $\begingroup$ We can, however, make aromatic selenium compounds if the selenium is placed outside the ring, see for instance google.je/patents/US4755589 $\endgroup$ – Oscar Lanzi Mar 20 '16 at 2:11

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