Predict the major products of the following reactions.
(...

Question

Predict the major products of the following reactions.

(a) (E)-3-methyloct-3-ene + ozone, then (CH₃)₂S

Accepted Answer

Hey, everyone. And welcome back in today's video, we are going to solve this problem which asks us to give the major products for the synthesis of Alcan shown below. And as the problem suggests, the reaction is between two metal beauty too in ozone at negative 78°C, followed by the addition of dimethyl sulfide. We can start our problem using those basic steps is usually by essentially drawing our starting material which is beat to in okay. So that's an al keen, it has four carbon atoms in the main chain and the position of the double bond starts at carbon number two. So basically over here, we're going to extend that pi bon from carbon to to carbon three and carbon number two also contains that metal group. So we're going to add a metal group that that's how we're starting material. And we can say that according to the problem, we are treating it with always someone. So that would be 03 at negative 78 degrees Celsius. And this is the temperature that you will commonly see in literature. And number two, we definitely need to enumerate this as a different step because these two reactions do not take place simultaneously. These are step by step reactions, we are adding the metal sulfides. We can use abbreviation for metal S M E and that we are dimethyl sulfide. You want to predict the products of this reaction. And the problem gives you a great hint. It's an arsenal this reaction, right? These two regions imply and Ahsanullah this reaction, since this is a nose analysis reaction, we are going to recall a quick and for us, basically, we are going to draw a general reaction for a hypothetical alkaline. Now imagine that you are starting with a double bond and you have different substations bonded to it. Suppose that on the right? And you have an alcohol submission are one and hydrogen and on the other end, we may add to alcohol substations, let's label them as R two and R three. So that would be R two and then that will be our three. We're going to learn a very quick method that will allow us to predict products momentarily when you get used to it, you will notice that it's so fast that you can just look at the molecule and understand what your products are. Okay. So let's get started. Let's take a look at this double bond and what we want to do, we will just label this reaction as and also knows his reaction. So for complete clarity, we are going to rewrite our regions that ozone followed by dimethyl sulfide. And now what you want to think about is the cleavage of that carbon carbon double bond. So step number one, you're finding your double bond and you're going to break up and what you can do to practice, you can essentially draw two results on fragments. Okay. So on the right, you're going to add one part of the double bond with its corresponding Substations. So that would be R two and R three. Then if you look at what we produced, on the other hand, you have that double bond, right? Basically that part of the original double bond, you're breaking it apart and you're pretty much sharing that double bond equally. Now, we are going to fill the remaining substations. So that would be our one and hydrogen. So if we add them, that would be are one in this position and hydrogen over here. Now, if you look at these two fragments, you can just combine them together into single starting material, right? Just imagine you approach them close to each other and combine them into one double bond that we are starting materials. So we have done nothing, right? We just drew our fragments. So to get our actual products because those are not carbon atoms, right? We are going to just add those oxygen atoms that come from ozone. So if we add our oxygen atoms over here and here we get our products and that's how you see it as we may simply notice that one product is a key zone. Another one is an al to hide because a kitten has two alcohol groups allied has a hydrogen. If you have another hydrogen over here, you would just have another Allied, right? You would have formaldehyde, but that's the most important thing. You just want to understand how it works. And that's pretty simple, right? You're just going to break the double bond and add oxygen atom at each end. So you're basically incorporating one option over here another over here. And you're done your, you have two structures. The only difference is that if you have a cyclical keen, that would give you one structure, but don't worry about it. For the purposes of this problem, we are just going to apply this general scheme and if we are going to break our double bond, we will get to fragments. So now we we get one double bond. If we look at the left part, this carbon atom has two metal groups. So we're just going to draw two metal groups, one to write. And I feel like at the other end, we can start by drawing our double bond and it has a model group. And in addition to that, it contains that implicit hydrogen atoms. So we can expand it for complete clarity. You can now notice that there is this hydrogen and once again, we broke our double bond, we just need to add those oxygen atoms to get our carbon compounds. And indeed, we got our products. One of them is ethanol, that's our Aldo hide. And another one is a stone, that's our stone. We got our products, we can label this is our final answer. So this would be our major products. When two metal beauty and undergoes analysis, we produced acetone and ethanol. One of them is the ketone. Another one is ethanol and another one is an al tied. My apologies and the way we got it was just thinking about the general scheme of the carbon, carbon double bond cleavage using those analysis. Number one edition of ozone followed by the addition of the metal sulfide. We can now conclude that the correct answer choice. The small pool choice question is a. However, if you have any questions, don't have seats, leave your comment down below in the comment section and thank you for watching.

Predict the major products of the following reactions.
(a) (E)-3-methyloct-3-ene + ozone, then (CH₃)₂S

Key Concepts

Ozonolysis

Reagents in Alkene Reactions

Mechanism of Alkene Reactions

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