00:01
So we have three different organic compounds here, and we want to figure out which of these are going to be mesocompounds.
00:07
And so it's important to remember for this question that mesocompounds are those that are acryral due to a planet cemetery.
00:14
However, they do have chiro centers themselves.
00:18
And so looking at compound a, we see that we actually have two different carol centers.
00:24
And so i'll go ahead and mark those in green here.
00:28
So those are going to be our chiral centers.
00:30
And we see that if we were going to assign configuration to each of those carousin centers, we see that this one's going to be s and this one's going to be r.
00:42
Right? so what's important here to remember, though, and we're trying to figure out whether or not this is a mesocompound is we're looking for that plane of symmetry.
00:49
So we see, as a matter of fact, that there is that plane of symmetry right down the middle of that molecule.
00:54
And so we would say that this is a meso compound because the compound itself is achyrol, even though it does have chiral centers.
01:04
So we would say that this is meso.
01:07
And although this is not a hardcore, steadfast rule, what you tend to see with these, when you see two different chiral centers, and you draw a plane of symmetry right down the middle, is that even though the relative configuration of these groups are the same, so for example, you see the hydroxyxyxyxyxyrens, and the hydrogen groups are in the same orientation of space.
01:33
When compared to each other, the absolute configurations are actually switched here, so you see that the left side is an s configuration and the right side is in our configuration.
01:44
So going on to look at compound b here, we can go ahead and see if we have any chirocarbons.
01:50
And as a matter of fact, looks like we have two again...