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


  • Conjugation is not complete however we have O atoms
  • Os are both sp3 hybridized. If one of the O donates 1 lone pair, this fits Huckle's number (4n+2) however, the conjugation is not complete
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Problem Details

Which heterocycles are aromatic?