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Video Solution: Write a structural formula for the most stable conformation ...

Problem

Write a structural formula for the most stable conformation of each of the following compounds: 

(c)  cis-1-Isopropyl-3-methylcyclohexane 

Video Transcript

So, now let's come up with the most stable chair conformation for cis 1-isopropyl 3-methycyclohexane and just to do this, just make a little bit more clear what that might look like, I'm going to go ahead and give a cyclohexane here in planar structure and then we've got, we've got cis isopropyl, so I'm going to say that this is on a wedge and then we've got our two carbons coming up like that, so that's our isopropyl group and then we have number three is going to be methylcyclohexane, so I'm going to get it a wedge as well, so it can be cis with our isopropyl group, so now it's converting to chair, okay? And let's go ahead and give this as our number 1, number 1, I'm going to go ahead and say that we've got it pointing up since we've got those we've got around the wedge here, we've got our isopropyl and then we've got our 3 methyls, so that's also going to be in the axial, but guys we know that these don't like to be in axial positions, right? Much prefer to be in equatorial, so let's go ahead and do a chair flip and what we get is this, and now we can go ahead and say that this is over here our isopropyl is now in the, it's still up and now it's in the equatorial position and then our other one is also going to be in the equatorial, there's our methyl, okay? Notice they're still in the same positions, right? there's just when we do the chair flip we generally shift positions over to the left a little bit like that, right? or what seems to be the left, but guys let me know get any questions, this is the most stable conformation because of Equatorial preference, okay? So let's move on.

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