Chapter 13 Unsaturated Hydrocarbons 13.6 Aromatic Compounds
Aromatic Compounds Benzene is • An aromatic compound. • A ring of 6 C atoms and 6 H atoms. • A flat ring structure drawn with double bonds. • Represented by two structures because the electrons move among the C atoms.
Benzene Structure • Because the pi electrons in benzene are shared equally among the 6 C atoms, benzene can also be represented as a hexagon with a circle drawn inside.
Naming Aromatic Compounds • A benzene with a single substituent is often named as a benzene derivative. Methylbenzene Chlorobenzene
Some Common Names • Some substituted benzene rings have common names that have been in use for many years.
Naming Aromatic Compounds • A benzene ring with two or more substituents is numbered to give the lowest numbers to the side groups. • Common names use the prefixes ortho- (1,2-), meta- (1,3-) and para- (1,4-).