1. Naming Branched Chain Alkanes, Alkenes, and Alkynes

2. Isomers
Compounds that have the same molecular formulas but different structural formulas
Branches on the 1st or last C are not branches, they just extend the chain
How many isomers can you draw for C6H14?

3. Step 1 Name longest chain
Use ane for all single bonds
Number so first branch comes closest to an end.

4. Step 2 Name the branches with a yl ending
Remember to put them in alphabetical order
Put the number of the C where the branches come off of.

5. Example CH3-CH2-CH2-CH2-CH3
CH3 CH3 CH3 CH3-CH-CH-CH-CH-CH2-CH CH2-CH3
CH3-CH-CH-CH2-CH3
CH3 CH2-CH3

6. Drawing Structures

7. Step 1
Draw longest chain

8. Step 2 Put the branches on the chain
Put them on the #C given in the name

9. Step 3 Give the subscript to the H’s C on end get 3H
C in middle with no branch get 2H
C in middle with branch get H
C in middle with 2 branches get no H

10. Examples Butane 3,4-diethyl hetpane
3,7 diethyl 8-methyl 5-propyl nonane

11. Alkenes and alkynes

12. Step 1 Name longest chain
Use ane for all single bonds
Use ene if there is a double bond
Use yne if there is a triple bond
Remember if double or triple bond, put the number of the C where the double or triple bond starts.
Always number C so the double or triple bond comes closest to an end
If no multiple bonds, number so first branch comes closest to an end.

13. Step 2 Name the branches with a yl ending
Remember to put them in alphabetical order
Put the number of the C where the branches come off of.

14. Example CH2-CH3 CH3-CH=CH-CH-C-CH-CH3 CH2-CH2-CH3 CH3

15. Drawing Structures

16. Step 1 Draw longest chain
Remember to include any double or triple bonds starting on the #C in the name

17. Step 2 Put the branches on the chain
Put them on the #C given in the name

18. Step 3 Give the subscript to the H’s so all C have 4 bonds
C on end get 3H
C in middle with no branch get 2H
C in middle with branch get H
C in middle with 2 branches get no H
Look at double and triple bonds to determine how many H are needed by the C.
No C can have more than 4 bonds.

19. Examples 6-ethyl 4,4-dimethyl 2-octyne 3-ethyl 2-methyl 1-hexene
3-ethyl 4-,methyl 1-pentene