00:01
Problem number 45 from the smith organic chemistry textbook.
00:05
And this problem says, how can you use proton nmr spectroscopy to distinguish between the two molecules that i've drawn here? and so basically, the answer to this question is coupling constants.
00:22
So the protons that we're going to be looking at, we are going to be looking at these two protons here, and we're going to be looking at these two protons here.
00:38
And so in the molecule on the left, these two protons have a geminal relationship.
00:46
So they are two protons.
00:48
They're on the same carbon.
00:50
They're geminal to one another.
00:52
The two protons in the molecule on the right have a trans relationship.
00:58
So they are on adjacent carbons, and they are opposite to one another in space.
01:06
And so we're going to be comparing geminal and trans.
01:10
And as i said, we need to look at the coupling constants here.
01:14
So remember, coupling constant is expressed as a j value...