Drill: Name the
following:
Alkenes
Alkenes
•Hydrocarbons with
at least one double
bond
Alkenes
•Each double bond
reduces the number
of hydrogens in the
hydrocarbon by two
Alkenes
•All alkenes are
unsaturated
hydrocarbons
Unsaturated
Hydrocarbons
•Contain less than the
maximum number of
hydrogens
Alkenes
Naming Alkenes
•Number the carbons on
the chain; so that, the
double bond has the
lowest possible number
Naming Alkenes
•The double bond will
always fall between
two numbered carbons
Naming Alkenes
•Apply the lower of
those two numbers to
the double bond
Naming Alkenes
4
2
1
3
2-butene or
Buta-2-ene
Problems
4
2
1
3
2
1
3
4
Geometric Isomers
4
2
1
3
2
1
3
4
Geometric Isomers
•Isomers whose
arrangement is same
side (cis) or opposite
side (trans) of a
stationary bond
Naming Alkenes
•Draw a line through the
double bond parallel to
each of the bonds in the
double bond
Naming Alkenes
4
2
1
3
Naming Alkenes
•If the two ends of the
chain are on the same
side of the line, it is a
cis-double bond
Naming Alkenes
•If the two ends of the
chain are on opposite
sides of the line, it is a
trans-double bond
Naming Alkenes
•Place cis or trans at the
start of the name in the
organic compound
trans-2-butene
trans-buta-2-ene
4
2
1
3
Draw the Following:
trans-3-ethyl-4,6dimethyl-5cyclopentyl-2-octene
Drill: Draw the
condensed, skeletal, &
stick structures for:
cis-3-ethyl-4,6-dimethyl-5cyclopropyl-2-octene
Review
Alkenes &
Cycloalkanes
Name:
Main chain
Name ending
Branches
trans-3,4-dimethyl3-hexene
Name:
Main Chain
Name ending
Branches
trans-3-methyl-2cyclopropyl-3-heptene
Name:
Main Chain
Name Ending
Branches
cis,trans-7-methyl2,4-nonadiene
Name:
Main chain or cycle:
Branches:
1,1,2,2,4,4hexamethylcyclohexane:
Name:
Main chain or cycle:
Branches:
Cyclohexylcyclohexane:
Name:
Main chain or cycle:
Branches:
1,4-dicyclohexyl
cyclohexane:
Draw:
•trans-1cyclobutyl-2methyl-3-hexene
Draw:
cis-2-methyl-1octylcyclohexene
Draw & Name
isomers of:
•C5H10
Naming Alkenes
•Name the alkenes
on the board