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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: 

(a)  2,2,5,5-Tetramethylhexane (Newman projection of conformation about C-3—C-4 bond) 

Video Transcript

So let's come up with the most stable Newman projection conformation for 2,2,5,5-tetramethyl hexane and what that tells me, right? is that we've got a hexane like that, clean that up a little bit, okay? And then we got on our two carbon, we've got 2 methyls and on our five carbon we've got 2 methyls, so let's say we're going to be looking down this bond because it'll make our lives a lot easier, we're going to have a Newman projection, looks like this, here we're going to have our two hydrogens coming down, right? So, our front carbon is or look like this, it's going to be the Mercedes symbol our back carbon is going to be our Y, right? So, our front carbon has this going on, right? It's got this guy then this front carbon that we're moving over here, right? We have a carbon that has 3 methyl groups coming off of it, so we're going to have C parenthesis CH3,3, our back carbon, right? Now, that we have our front carbon filled, our back carbon is going to have the same thing, right? It's going to have this C coming off with the 3CH3's and that's going to be coming down, so it's going to look like this C, CH3,3 and that actually is our most stable conformation because now we have our largest groups anti to each other. Alright guys, so let me know if you have any questions, if not, let's move on.

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