4.6 Drawing Newman Projections

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7 Terms

1
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Can molecule change their shape?

Yes, molecules can change their shape

2
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What are conformations?

  1. Single bonds can twist without breaking and allows a compound to change it’s 3D structure

  2. Ex: C-C single bonds, C-O single bonds, C-N single bonds

3
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What is the difference between a single and a double bond when it comes to conformations?

  1. Any single bond can rotate so they can give different conformations

  2. Double or triple bonds can’t rotate so they give no conformations

4
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How are we able to compare conformations?

  1. Drawing Newman projections

5
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This is an example of the different ways a compound can be drawn (ethane)

  1. Wedge and dash

  2. Sawhorse

  3. Newman Projection

<ol><li><p>Wedge and dash</p></li><li><p>Sawhorse</p></li><li><p>Newman Projection</p></li></ol><p></p>
6
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Figure 4.3 (a) A cartoon eye shows the point of view taken for a Newman projection (b) A New mann projection of ethane, showing the front and the back carbon

  1. To draw a Newman Projection you have to look at it from the angle it is showing you

  2. The front of the circle will be the front carbon

  3. The back of the circle will be the Back carbon

<ol><li><p>To draw a Newman Projection you have to look at it from the angle it is showing you</p></li><li><p>The front of the circle will be the front carbon</p></li><li><p>The back of the circle will be the Back carbon</p></li></ol><p></p>
7
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Answer the following practice questions

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