Introduction to Nomenclature
18.8 Branched Substituents.
18.8.1 Naming branched substituents
Figure 49
3-(1-methylethyl)-2,4-dimethylpentane
The main chain in the drawing is numbered 1-5. The main part of the branched substituent,
an ethyl group, is numbered 1’ and 2’. The methyl substituent off of the ethyl substituent
is not numbered in the drawing.
To name the compound, put the whole branched substituent name in parentheses and then
number and alphabetize as if a simple substituent.
18.9 Common system
Some prefixes from the common system are accepted in the IUPAC system.