1. Alkenes, Alkynes and Functional Groups
Chapter 25 & 26 Notes, part II
Alkenes, Alkynes and Functional Groups

2. Alkenes
Up to now, we have only talked about carbons that are single bonded. They have been saturated—they have a hydrogen in every possible position.
Alkenes are hydrocarbons that contain at least one double bond in the carbon chain.

3. Naming Alkenes
To name an alkene, count the number of carbons in the main chain and use the prefix, then end it in –ene.
If there is more than one spot where a double bond could occur, number it just like you would number a substituent.

4. Alkynes
An alkyne is a hydrocarbon that contains at least one triple bond.
Both alkenes and alkynes are considered unsaturated, because more hydrogens could be added if the double or triple bonds were broken.

5. Naming Alkynes
To name an alkyne, count the number of carbons in the main chain and use the prefix, then end it in –yne.
If there is more than one spot for a triple bond, number it just like you would number a substituent.

6. Functional Groups
A specific arrangement of atoms in an organic compound that is capable of characteristic chemical reactions is called a functional group.
We will look at the structure and name of several functional groups.

7. Alcohols (R-OH)
The functional group –OH is called a hydroxyl group. A hydrocarbon with a hydroxyl group attached is an alcohol.
To name an alcohol, drop the –e ending from the parent alkane and add –ol.
If there is more than one spot where a hydroxyl group can go, number it just like a substituent.

8. Carboxylic acids (R-COOH)
A carboxyl group is a carbon with an oxygen double bonded to it and an oxygen single bonded to it and single bonded to a hydrogen.
To name a carboxylic acid, take the –e off of the end of the parent alkane and add –oic acid.

9. Amines (R-NH2)
Amines are an ammonia based organic compound. It consists of a carbon chain connected to an amine group.
Amines are closely related to amino acids—they are amines with a carboxyl group.
Amines are named by taking the parent alkane, drop the -e and adding the ending –amine.

10. Other Functional Groups
Ethers R-O-R O
Aldehydes R-C-H
Ketones R-C-R
Esters R-C-O-R