00:01
In this problem, we're looking at proton nmr.
00:04
And this is a really useful tool.
00:06
It's a type of spectroscopy that allows us to determine molecular structure.
00:11
We use this a lot in practical applications in the lab, where we're synthesizing something and we think we know what we made, but we need to confirm it, because sometimes you're surprised that it is not at all what you expected.
00:25
So in this problem, we're looking at how we can interpret the spectra we get out.
00:30
So here we have a molecular formula of c4h8o2.
00:40
And the first thing we want to do is find what's called degrees of unsaturation.
00:45
This will tell us how many rings and pi bonds we have.
00:48
So we take two times the number of carbons, add two, subtract the number of hydrogens, and divide by two, and we get one.
00:58
And often when we see formulas where we have two oxygens, that means we're gonna have a carbonyl, so that will be our pi bond.
01:07
Now, as we look here, we need to decide if that means we have for this other oxygen, if this is going to be an ester, if we're going to have an ether somewhere else, or if we have an alcohol.
01:24
Well, we can eliminate the idea of an alcohol really fast, because this would integrate to a peak to one hydrogen, and we don't have that.
01:34
If we're thinking about having an ether, well, hydrogens on the carbons next to these will be down between three and four...