1. Schedule Today (4/17): Chapter 21 Friday (4/19): Chapter 21
Should have read through at least Section 21.4
Friday (4/19): Chapter 21
Read through at least 21.5
Review Sessions:
Monday (4/22): 203 Noyes Lab, 8-10 pm
Tuesday (4/23): 101 Armory, 4-6 pm

2. Alkenes and Alkynes These are called “unsaturated hydrocarbons”
Double bonds = alkene
Triple bonds = alkyne
Alkenes: CnH2n
Akynes: CnH2n–2
Cis-trans isomerism

3. Alkenes – ethene and propene
Ethene (ethylene)
Propene (propylene)

4. Alkenes – “butene” 1-butene IUPAC: But-1-ene a) cis-2-butene
b) trans-2-butene

5. Aromatic Hydrocarbons
Note: “phenyl” prefix versus “benzene” suffix. “Phenyl” is used when benzene is a substituent.

6. Clicker Question
Name this compound. a) 3-methyl-4-hexene b) 3-methyl-trans-4-hexene c) 3-methyl-trans-3-hexene d) 4-methyl-trans-2-hexene e) trans-2-isoheptane

7. Clicker Question
Name this compound. a) 3-methyl-cyclopentene b) 1-methyl-cyclo-3-pentene c) 4-methyl-cyclopentene d) cyclo-4-hexene e) 1-methyl-cyclopentene

8. Alkenes and Alkynes
Double (and triple) bonds take preference over alkyl groups.
trans-4-methyl-2-pentene
(not trans-2-methyl-3-pentene)

9. Organic Chemistry “Humor”

10. Organic Chemistry “Humor”
But keep triene!

11. Organic Chemistry “Humor”

12. Organic Chemistry “Humor”
Name this molecule.

13. Organic Chemistry “Humor”
Name this molecule.

14. Organic Chemistry “Humor”
Name this molecule.

15. Organic Chemistry “Humor”
Name this molecule.

16. Organic Chemistry “Humor”
Name this molecule.

17. Organic Chemistry “Humor”
Name this molecule.

19. Clicker Question
How many isomers of “chlorobutane” are there? a) 1 b) 2 c) 3 d) 4 e) 5

20. Question
How many isomers of “dichlorobutane” are there? Name them.

21. Alcohols (1°, 2°, and 3°)
We label these based on the number of carbons attached to the carbon that is attached to the –OH group.

22. Clicker question
Name the following compound. a) 7-methyl-2-propyl-5-octanol b) 4,9,-dimethyl-7-decanol c) 2,7,-dimethyl-4-decanol d) 2-methyl-7-propyl-4-octanol e) I get a different name/I cannot name this one

23. Ethers These are like alcohols (R-O-H vs. R-O-R’). Ether Boiling Pt.
Boiling Point
Dimethyl ether
CH3-O-CH3
–25°C
Ethanol
CH3CH2OH
79°C
Ethyl methyl ether
CH3-O-CH2CH3
11°C
Propanol
CH3CH2CH2OH
82°C
Diethyl ether
CH3CH2-O-CH2CH3
35°C
Butanol
CH3CH2CH2CH2OH
117°C

24. Aldehydes and Ketones
Similar to alcohols vs. ethers, the aldehydes and ketones have a similar structure (carbonyl group). This group is bonded to two carbons in ketones and at least one hydrogen in aldehydes.

25. Aldehydes – named with “-al”
Methanal Methanaldehyde Formaldehyde

26. Ketones – named with “-one”
2-propanone Propanone Dimethyl ketone IUPAC? Propan-2-one Acetone