Polysubstituted Benzenes
73.2 Naming Conventions.
When a benzene ring has more than one substituent group attached, the location of all of
the groups not directly attached to carbon number one must be explicitly declared. This is
done by listing the number of the carbon atom where the group is attached, followed by a
hyphen and the group’s name. The carbon atoms of the benzene ring should be numbered
in order of previously established precedence, i.e., a bromine would take precedence over a
nitro group, which itself would take precedence over an alcohol or alkane group. The names
of the groups should be listed in alphabetical order, i.e. ”2-methyl-5-nitrobenzaldehyde.”