1. Alkenes and Alkynes SWBAT: Name and Draw Alkenes and Alkynes

2. More Substituent Groups  methoxy -OCH 3  nitro -NO 2  neopentyl  neohexyl  vinyl -CH=CH 2  allyl -CH2-CH=CH 2 Only iso-, neo- are alphabetized, tert, sec are not neopentyl, neohexyl, vinyl and allyl are usually only found on aromatic compounds

3. Alkenes – naming rules  Number longest continuous chain of carbons, double bond receives lowest possible numbers  Alphabetize groups without using prefixes  Use cis and trans stereoisomerism  List the numbers for the double bonds  Alkenes end in -ene  If more than one double bond end in diene, triene, tetraene

4. Alkenes Practice 5-chloro-2-hexene 1,5-dichloro-1,4-hexadiene CH 3 –CH=CH–CH 2 –CH 3 2-pentene

5. Alkenes Practice 5-bromo-4-chloro-7,7- dimethyl-4-undecene 4-ethenylcyclohexanol 1,2-difluoro-cyclohexenetrans-8-ethyl-3-undecene Tip – 11 carbon is undec-

6. Stereoisomerism Cis Trans Carbon that is double bonded (alkenes) have an sp 2 hybridization – so they are trigonal planer – ergo, we need to account for placement of substituents

7. Alkenes Practice 5-chloro-cis-2-hexene c

8. Cycloalkenes – naming rules  Number the carbons double bond receives the lowest possible number, start with #1  Groups receive next lowest number  List groups  List double bond numbers  Long chain name  End in diene, triene, tetraene for multiple double bonds

9. Naming alkenes (Don’t forget the cis or trans) 5 – methyl – trans – 2 – heptene Why is the cyclohexene numbered the way it is numbered?

10. Alkynes  Naming is similar to alkenes except no cis or trans.  Alkynes end in -yne

11. Moodle  Sign out a computer  Go to Moodle (link off my website)  Go through all links under  Alkanes  Alkenes & Alkynes