For each structure,
1. draw all the stereoisomers.
2. label each ...

Question

For each structure, 1. draw all the stereoisomers. 2. label each structure as chiral or achiral. 3. give the relationships between the stereoisomers (enantiomers, diastereomers). a.

Fischer projection of a chiral molecule with hydroxyl groups and aldehyde.

Fischer projection labeled (a) showing a chiral molecule with hydroxyl groups.

Accepted Answer

Hey everyone. Let's do this problem. It says for the following compound one, right? The structure of all the stereo I Summers and label each of them as a Cairo or Cairo and to identify the relationships between the stereo I summers. So how do we find the number of possible stereo I summers? We should know that before we start drawing them. Right. So we can use the formula two to the N. Where N is the number of Cairo centers. So here we have two Cairo centers on two and three carbons. Two and three. We have four different groups on each of those carbons. So doing to raise to the power of two gives us four possible stereo members including this. So three more structures we can draw. And how do we draw stereo customers? Well, we're going to change the position of the carbon groups. I'm sorry, the groups on the Cairo carbons on the Cairo carbons. Okay, so different combinations of those. Maybe just switching one Cairo carbon or switching the groups on both Cairo carbons. Those will create different types of stereo I Summers, which speaking of the problem mentioned to identify the relationships between the stereo it simmers. We can have a name tumors in an tumors, which are the non super imposible mirror image. And that will happen when all of the Cairo groups have switched their configuration. Okay, so you're changing the groups on all the Cairo centers whereas dia stereo MERS are not mere images. So you're only switching maybe one of the Cairo centers or you're at least not switching all the Cairo centers. Okay. And lastly, we will label these as Cairo or a Cairo the stereo. It simmers and it'll be Cairo if it has asymmetric carbons and no plane of symmetry. So no plane of symmetry. Alright, so let's draw our stereo. I Summers first, I'm going to redraw the one we are given, just so we can draw all of our relationships to the other structures nice and easily. Okay, so the next structure, let me label this as Cairo or a Cairo. This is going to be Cairo because there is no plane of symmetry. Either way. I draw it. And we have the two Cairo centers On Carbons, two and 3. Okay, the next structure, I'm going to switch the groups just on carbon too. So we have the alcohol group on the left. Now hydrogen on the right, and then we'll keep The carbon three groups the same. Okay, Now, for C the next stereo I summer I'm going to do the opposite. So I'm going to keep carbon to the same. And now I'm going to switch the groups on carbon three. So go back to alcohol on the right for carbon to now, we'll have alcohol on the left for carbon three. And for our fourth and final stereo, I summer, I'm going to switch them both around. So we have the alcohol groups both on the left hand side of our fisher projection. Right, Okay. And I got ahead of myself. These are all going to be Cairo no symmetry. So now, let's look at the relationship between these stereo customers. So, I'm going to make a list of an anti MERS and die A stereo MERS different color. Di stare humors. I think spelling dia stereo murs is the most difficult part of organic chemistry. Okay, so the Ananta MERS remember are mirror images. So that means we have to change all the Cairo centers right? For it to be a mirror image. So I mentioned that stereo customers, A and D. Were changing all of the Cairo centers, right? Both of those ohh groups got changed to the left side. So A and D. Are going to be an anti MERS. And also, if you look at B and C, we have the alcohol group and methyl group on the left and now on C, they are on the right side. So B and C are also going to be an anti MERS. Okay, now, let's see our dia Stermer. So now we're looking for only one Cairo center has changed. So basically every time I drew a new one, those will be dia Stermer. So A to B. I said, I was only changing one center, right? We only change carbon to And then from a to C. I said I was changing carbon three, but carbon to stay the same. And let's see from B to D. I'm only changing carbon three. Oops, B and d. And lastly from C to D. I am only changing carbon to Okay, so those are the relationships between all these stereo I Summers and that's it for this problem. I hope this video was helpful and thanks for watching.

For each structure, 1. draw all the stereoisomers. 2. label each structure as chiral or achiral. 3. give the relationships between the stereoisomers (enantiomers, diastereomers). a.

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