CHEM301 F08 CA5A key

CHEM301 F08 CA5A key - CHEM301, Fall 2008 Dr. Ruder 1 Class...

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CHEM301, Fall 2008 Dr. Ruder 1 Class Activity 5A Conformations of Alkanes Part A: Acyclic Compounds Model 1: Conformations of Ethane Conformational isomers have the same sequence of atoms, but the arrangement in space differs based on rotation around single bonds. There are three ways to represent conformations, illustrated below using ethane. H H 1 H H 2 H H H 1 H 2 H 3 H 3 H H H 1 H H H H 3 H 2 H 3 H H H H 1 H 2 H 1 H 3 H 2 H H H wedge/dash sawhorse Newman H 3 H 2 H 1 H H H st agger ed eclipsed Questions 1. In the wedge dash model, how are the hydrogens represented in three dimensions? 2. Envision the wedge dash model (on the top of Model 1) where the solid lines of the C-C are in the plane of the screen at the front of the room. Visually rotate the whole molecule by 90 o , so that the C-C bond is now perpendicular to the screen. Now you are looking at the sawhorse model. On the sawhorse model above, write an “F” near the carbon that is in the front and a “B” near the carbon that is back or furthest away from you. 3. The Newman projection is just a Sawhorse projection that has been compressed along the C-C bond. How is the carbon in the back represented in a Newman projection? How is the carbon in the front represented? 4.
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CHEM301 F08 CA5A key - CHEM301, Fall 2008 Dr. Ruder 1 Class...

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