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Solution: For each of the following pairs of compounds, determine whic...

Question

For each of the following pairs of compounds, determine which compound is more stable (you may find it helpful to draw out the chair conformations):

Video Transcript

Alright guys. So, for this question, we're looking at the stability of both of our molecules. So, a good way to measure stability especially in six membered rings is we have a chair conformation that both of these molecules can actually assume, right? Both of these cyclohexane can actually form these chairs and we can convert our substituents and relate them to the chairs and see how our chair is far as far as the ability goes, so notice that we have these two substituents that are in 1, 3 relationship to each other and on our chair up here, we know that the one in three position represent these two, right? We can label them anyway but it's easier to visualize them this way, so let's keep it consistent now. So, let's actually draw in our substituents. Now, in one of them what we can do is show that they're both facing down because they need to be in the same side, right? there cis each other and they're going to want to be in the equatorial position because the equatorial position in our chairs has to do with the more stable position, so let's say now and the other 1 3 is going to stay the same, what does that mean for one? Now, it's on the dash, right? So we know it needs to face the other direction. So, essentially here we have one axial and one equatorial and on the other one we have both equatorial. Remember, that the equatorial position for a chair is the one that allows this chair to be more stable. So, definitely the one on the left is going to represent the more stable compound when we think of it in this chair, okay? So hopefully that makes sense and you're able to convert the cyclohexane to their chairs. Alright guys so, let me know if you have any questions.

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