What is the major product of the following reactions? f.

Question

Accepted Answer

Hey, everyone. And welcome back in today's video. We are going to determine the identity of the major product of the reaction shown below. When we look at the given reaction, we notice that the reaction involves the presence of pyro and cyclo pencil lithium, which is our organ or lithium region. Now, we have to recall that organo lithium regions are significantly strong base in organic chemistry because we have our polarized carbon lithium bond. Lithium is a metal. So it's significantly electro positives and carbon is a nonmetal. So the electron density shifts towards a more electron negative carbon. Now, pyro has hydrogen bonnets and hydrogen. So we have a slightly acidic hydrogen, meaning pyro can act as an acid and we may simply understand that this should be an acid based reaction. Below. We are going to draw the two structures of pyro and cyclo pencil lithium and we will see how the reaction takes place. So we are adding our pal ring and we are going to expand nitrogen hydrogen bond for cyclo pencil lithium. We are going to draw a five member ring, expand that carbon lithium bond. And we are going to show how the carbon lithium electrons are basically transferred, we're attacking hydrogen from pyro which is bonded to nitrogen. When the hydrogen is captured, we are going to break that nitrogen hydrogen bond. And we are going to transfer electrons onto nitrogen in the form of a lone pair. Remember that initially nitrogen within the pyro rank has a lone pair. So we are basically forming an additional loan pair. Now we are going to draw a reaction arrow and we are going to add our products. So the first product that we get can essentially be obtained by drawing the pal ring but essentially removing hydrogen from nitrogen, we will now only have nitrogen with two lone pairs. So previously, we had one of them. Now we will have two total because there was, there is the original one and the new that has been formed from breaking that nitrogen hydrogen bond. So we are going to add two lone pairs of nitrogen and because nitrogen has two loan pairs and two bonds that will have a formal negative charge adjacent said we can indicate the presence of possibly charged lithium ion. And our next product would be cyclo Zane because now we are adding hydrogen to our cyclo pencil ring, right, notice how the electrons have been transferred into the formation of that carbon hydrogen bond. So this allows us to form cyclo penan. Now, the reason why this reaction is feasible is because viral has a PK A value of about 17. So this is our acid in the reaction. And if we look at the product side, we understand that our conjugate acid corresponds to the original base cyclo pencil lithium. So the conjugate acid of cyclo pencil lithium is cyclopse which has a PK valley of more than 60. Right? We understand that al canes and cycle alkanes, they are very low in acidity. Remember that reactions shift towards the formation of a weaker acid. So PK A of 17 indicates that the acid is stronger than that of PK of greater than 60 meaning this is an acid based reaction and we got our products, right? We will label our products in green and we are going to essentially state that based on the nature of the products that we got for this reaction. The correct answer to the multiple choice question is B thank you for watching.

What is the major product of the following reactions? f.

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