Problem: Which heterocycles are aromatic?

FREE Expert Solution

For heterocycles, the heteroatom can donate 1 lone pair if:

1. They are already sp3 hybridized

2. It will help aromaticity

a.

  • Conjugation is not complete however we have 1 O atom
  • O is both sp3 hybridized. If the O donates 1 lone pair, this fits Huckle's number (4n+2 = 6 pi electrons). This completes the conjugation as well
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Which heterocycles are aromatic?


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