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Can molecule change their shape?
Yes, molecules can change their shape
What are conformations?
Single bonds can twist without breaking and allows a compound to change it’s 3D structure
Ex: C-C single bonds, C-O single bonds, C-N single bonds
What is the difference between a single and a double bond when it comes to conformations?
Any single bond can rotate so they can give different conformations
Double or triple bonds can’t rotate so they give no conformations
How are we able to compare conformations?
Drawing Newman projections
This is an example of the different ways a compound can be drawn (ethane)
Wedge and dash
Sawhorse
Newman Projection
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
To draw a Newman Projection you have to look at it from the angle it is showing you
The front of the circle will be the front carbon
The back of the circle will be the Back carbon
Answer the following practice questions