For more such content, click here.

The Annulenes

Annulenes are monocyclic compounds with alternating double and single bonds

Naming

• Annulenes are named using a number in brackets that indicates the ring size. Benzene is [6]annulene and cyclooctatetraene is [8]annulene.

Aromatic vs Non-Aromatic

• The [14]and [18]annulenes are aromatic

• The [10]annulenes below should be aromatic but none of them can be planar

• A is not planar because of steric interaction of the indicated hydrogens
• B and C can not be planar because of large angle strain in the flat molecules

Benzenoid Aromatic Compounds

• Polycyclic benzenoid aromatic compounds have two or more benzene rings fused together

For more such content, click here.