3-Methyl
CH 3
heptane
CH 3 CH 2 CH 2 CH 2 CH
CH 2
CH 3
7 6 5 4 3
2
1
2-Methyl
CH 3
hexane
CH^63 CH^52 CH^42 CH^322 CHCH^13
1) The parent name is placed last; the substituent group, preceded by the
number indicating its location on the chain, is placed first.
- When two or more substituents are present, give each substituent a number
corresponding to its location on the longest chain.
4-Ethyl-2-methyl
CH 3
hexane
CH 3 CH CH 2 CHCH 2 CH 3
CH 2
CH 3
1) The substituent groups are listed alphabetically.
2) In deciding on alphabetically order disregard multiplying prefixes such as “di”
and “tri”.
- When two substituents are present on the same carbon, use the number twice.
CH 3 CH C CHCH 2 CH 3
CH 3
CH 3
methyl
CH 2
3-Ethyl-3- hexane
- When two or more substituents are identical, indicate this by the use of the
prefixes di-, tri-, tetra-, and so on.
