Naming Unsaturated Naming Unsaturated HydrocarbonsHydrocarbons

AliphaticAliphatic

AlkenesAlkenes

Alkenes/AlkynesAlkenes/AlkynesAt the conclusion of our time At the conclusion of our time

together, you should be able to:together, you should be able to:

1. Define an alkene2. Name, write and draw various

alkenes/alkynes

EthyleneEthylene

Definitions by B.C.

The IUPAC RulesThe IUPAC Rules

Double bonds are named using an –ene ending.Double bonds are named using an –ene ending.More than one double bond will have a –diene More than one double bond will have a –diene for two, –triene for three, etc. for two, –triene for three, etc. Double or triple bonds are given priority for the Double or triple bonds are given priority for the lowest numbers before substituent groups.lowest numbers before substituent groups.The longest chain must include the double bond.The longest chain must include the double bond.

Naming AlkenesNaming Alkenes

Alkene NomenclatureAlkene Nomenclature

The Scientific Methodbegins with

Questions about the World Around You.

Ever Wonder Why?...

you drive on a parkway and park on a driveway?

PolyenesPolyenes

Name These AlkenesName These Alkenes

3,4,4-trimethylpentene

3,4,4-trimethylpenta-1-ene

3-methyl-3-hexene

3-methylhexa-3-ene

4,7-dimethyl-2,5-octadiene

4,7-dimethylocta-2,5-diene

You Might Be a Redneck If…

Your wife can climb a tree faster than your cat.

You have a complete set of salad bowls and they all say "Cool Whip" on the side.

Naming Unsaturated Naming Unsaturated HydrocarbonsHydrocarbons

AliphaticAliphatic

AlkynesAlkynes

Euphemisms in Science We all know that some politicians and

government spokesmen use certain euphemistic phrases to give an aura of respectability to

descriptions of events or actions which would be offensive when expressed in plain English. The following is a list of Euphemisms in Science and

their translations into plain English.

“These results will be reported at a later date...”

I may get around to this!

The IUPAC RulesThe IUPAC Rules

Triple bonds are named using an –yne ending.Triple bonds are named using an –yne ending.More than one triple bond will have a –diyne for More than one triple bond will have a –diyne for two, –triyne for three, etc. two, –triyne for three, etc. Double or triple bonds are given priority for the Double or triple bonds are given priority for the lowest numbers before substituent groups.lowest numbers before substituent groups.The longest chain must include the triple bondThe longest chain must include the triple bond

Alkyne NomenclatureAlkyne Nomenclature

Hexyne

2-hexyne

3-hexyne

Alkenes/AlkynesAlkenes/AlkynesLet’s see if you can:Let’s see if you can:

1. Define an alkene2. Name, write and draw various

alkenes/alkynes

Name These Alkenes/Alkynes from Name These Alkenes/Alkynes from Page 25:6Page 25:6

C

C

C

Name These Alkenes/Alkynes from Name These Alkenes/Alkynes from Page 26:4Page 26:4

1. Longest chain = Cyclohexene

2. Lowest number for –ene, therefore, start from lower right corner and go counterclockwise

3. Methyl and propyl at

4. 3 position

5. Methyl is first in the alphabet

6. 3 – methyl – 3 – propylcyclohexene

Little Known Phobias!

Charminophobia

Fear of being squeezed

The IUPAC RulesThe IUPAC Rules

Double bonds are named using an –ene ending.Double bonds are named using an –ene ending.More than one double bond will have a –diene More than one double bond will have a –diene for two, –triene for three, etc. for two, –triene for three, etc. Double or triple bonds are given priority for the Double or triple bonds are given priority for the lowest numbers before substituent groups.lowest numbers before substituent groups.The longest chain must include the double bond.The longest chain must include the double bond.