Hey guys. So in this video, I want to discuss a pretty easy reaction called strong oxidation of monosaccharides. So guys we've already learned that bromine and water mixed together when exposed to a monosaccharide will make something called an aldonic acid, where you're going to turn the aldehyde at the top into a carboxylic acid at the top. You guys should remember this. Pretty easy reaction. I already taught it to you. Okay? But it turns out that we can do a stronger type of oxidation than this because that was called weak oxidation, remember? So if you're saying, well why is it weak? Well, it's weak in relation to this oxidation that we're about to discuss. This oxidation not only oxidizes the top aldehyde to a carboxylic acid, like bromine water did, but, and this is the important part, it's also going to oxidize the bottom alcohol into another carboxylic acid. So the product is going to be what we call a diacid. Okay? A diacid is just one of the names that's given for a dicarboxylic acid. You can call it a diacid.
So when exposed to nitric acid, which is the reagent of strong oxidation, monosaccharides can be oxidized into diacid derivatives called aldaric acids. Now, those names are a little bit confusing because they're so close together. Aldonic acid versus aldaric acid. I don't have a perfect way for you to memorize it. So just keep in mind that it's tricky and you might want to put that on a flashcard so that you can say okay, this aldonic acid has one carboxylic acid and the aldaric acid has two. Okay? Now, let's just go over the reagents very quickly. The reagents guys are very simple. It's just going to be some kind of aqueous nitric acid and a lot of times you'll find that in the problems or in the textbook they'll add heat. But if there was no heat, you would still know this is going to be a strong oxidation. The heat isn't 100% essential that it needs to be written out. Even though reaction conditions typically will be hot, but you know that sometimes different problems can be written in different ways. So just letting you know that it always revolves around nitric acid.
Now one thing that's interesting about creating these aldaric acids is that now we've potentially created a symmetrical molecule because notice that the top functional group is identical to the bottom functional group. So what that means is that due to the symmetry of those carboxylic acids, different monosaccharides can lead to the same aldaric acid product. So what I'm basically saying is that you could be starting off with two different disaccharides, but because of the fact that now both the top and the bottom are the same functional group, they could lead to the same product because they could be identical once you flip them. Okay? And I'm going to show you an example because I know it might be hard to visualize now, but I'm just letting you know that this is a thing. That sometimes you could get two different monosaccharides making the same, aldonic, I'm sorry, aldaric acid product. Okay. So let's go on to the next video where I'm going to do a practice problem with you guys.