Complex Organic Structures STEM Fair Practice Chemistry GT 1/26/15

Drill l New seats! l Set up your STEM Fair board and locate your grading sheets (or the ones that were given to you) l Draw the condensed structural formula for pentane.

Objectives l IWBAT Draw and name alkanes, alkenes, and alkynes. Name branched-chain alkanes Practice presenting my STEM fair board, and become more comfortable with the presentation portion of the STEM fair.

Practice Presentation l You will be paired up for the purposes of presentation. l One person will present their STEM fair board and the second will ask questions about the experiment (5-7 minutes). l Using the judges’ scoring guide, the second will evaluate the board. (2-3 minutes)

Partners (Set 2) Cook, Michael ATu, Kara G Jacobson, SamuelWashington, Orchid Knudson, Zachary IMcKay, Audrey M Whitaker, Samuel RMenjivar Perez, Samuel A Demers, CorySchluederberg, Katie T Orzechowski, Ella RThames, Maya W Lumsden, PatrickKanja, Grace Ahmed, TineerNelson, Victoria M Feinleib, Leanna MGarcia, Immanuel V Houser, Ashley KSullivan, Paige M Walter, Rachel ESweet, Sarah E Carey, Jenna LHilterbrick, Trevor A Chau, Nhu TBrown, Lindsey

Let’s Discuss l What was useful? l What do you need to improve? l What are you going to do to prepare for the STEM fair?

Alkenes and Alkynes l Alkenes contain a double bond between adjacent carbon atoms. l Alkenes have the general formula C n H 2n. l Alkynes contain a triple bond. l Alkynes have the general formula C n H 2n-2. Copyright © 2007 by Pearson Education, Inc. Publishing as Benjamin Cummings

Learning Check l Draw a condensed structural formula for: butene pentyne What do we see is confusing?? Maybe we need another way to name. l Identify this structure:

Complex Organic Nomenclature

What do you notice about these molecules?

How about these molecules?

So how can we name molecules so we know the locations of the side chains and the double/triple bonds?

Naming Rules 1. Count the longest chain of consecutive carbons. 2. Use the appropriate prefix and suffix to name the longest chain (same as before) 3. Number the carbons so the double/triple bonds or side groups have the lowest number l Example:

Naming Rules Continued 4. Write the number of the carbon the double or triple bond begins on in front of the name l Example:

You Try!

Naming Rules Continued 5. If there is a side chain: - follow the same naming rules -then name the side chain by writing the number of the carbon it is located on - count the number of carbons in the side chain - use the appropriate prefix for the side chains and add the ending -yl  Example:

You Try!

Naming Rules Continued 6. If there is more than one side chain, the side group names must be written in alphabetical order l Example:

You Try!

Naming Rules Continued 7. If there are multiples of the same side group, it needs to be denoted using a prefix - See example l Example:

You Try!