**Annulenes are the completely conjugated monocyclic hydrocarbons containing an even number of carbon atoms. They have the general formula CnHn (when n is an even number) or Cn.Hn+1 (when n is an odd number)
**The first 3 members of the series, (4]-, -, and -annulene but you must have used their name as 1,3- cyclobutadiene, benzene and 1,3,5,7- cyclooctatetraene.
**Annulenes could be aromatic, anti aromatic or non-aromatic.
# Annulene: anti-aromatic
# Annulene: aromatic
#[81 Annulene: non-aromatic
# Annulene: non-aromatic
# Annulene anti-aromatic
# Annulene: anti-aromatic.
# Annulene: aromatic.
**The following bridgehead  annulenes are aromatic:
#9,10 methane  annulene
#9,10 oxa  annulerne
#9,10 aza  annulene
**Preparation of  annulene,  annulene and 9,10-methane  annulene from simple and easily available molecules.