Page 22 - Pharm.Org.Chem-I 02-06-05-101
P. 22
3- When two or more substituents are identical, use
the prefixes di-, tri-, tetra- etc.
4- When branching first occurs at an equal distance
from either end of the parent chain, choose the
name that gives the lower number at the first point
of difference.
CH3
H3C CH H2 CH3
CH C
C CH
H2
CH3 CH3
2,5,6-Trimethylheptane X
2,3,6-Trimethylheptane
39
5- When two chains of equal length compete to
be parent, choose the chain with the greatest
number of substituents.
CH3 CH3
13 5 7
H3C 2 CH 4 CH 6 CH3
CH CH C
H2
CH3 CH2CH2CH3
2,3,5-Trimethyl-4-propylheptane
(alphabetical)
40
20
