Give an acceptable name for each amine.
(b)

Question

Give an acceptable name for each amine.

(b) Chemical structure of an amine with an attached NH2 group, illustrating its molecular configuration.

Accepted Answer

Welcome back everyone. What is the appropriate Iupac name of the following? I mean, we're given the, I mean that we once name and we can begin solving this problem. First of all, we will identify our parent, which in this case corresponds to our six number ring because it is bigger than our side chain. So first of all, because we have a total of six carbon atoms within the ring, we're going to say that the parent is cyclohexane, but we need to modify our name slightly instead of saying Cyclohexane because we actually have an amine in our structure. We're going to say that we have Cyclo Hean Amine. OK. Well done. So we know our parent now the only substituent that we have is the isopropyl substituent. We noticed that we have a three number chain which is bonded to the six number dr via carbon number two, right. So that would be an isopropyl substituent. We have to recall that we want to appropriately enumerate our parent. And because amine is the main functional group or the highest priority functional group in the given structure, it automatically defines carbon number one. That's why we didn't say cyclohexane one amine, since carbon number one is already defined by the carbon atom that is bonded to the amino group. So if we want to appropriately enumerate our ring, we're going to go counterclockwise because that minimizes the coefficient for the isopropyl group. Otherwise we will get the coefficient of all right, if we go clockwise instead. So we said that we are going to enumerate it counterclockwise, well done. And now this allows us to state the position of our substituent bonded to carbon. Number three, we have the isopropyl group. Well, then we have our substitutions and we can partially conclude that the name would be three isopropyl cyclo hex. I mean, the only problem is that we actually have two chiral carbon atoms. We have carbon number one and carbon number three being chiral. So we have to determine the absolute configurations of carbon number one and carbon number three. So let's go ahead and do that. We are going to assign R or S configuration to each stereo center. So starting with carbon number one, we first will understand that there is an implicit hydrogen atom which is pointing up and that we simply want to assign our priorities. We already know that hyen gets the lowest priority based on its lowest possible atomic number, nitrogen will get the highest priority because its atomic number is greater than that of carbon. And now between the two remaining substitutions, we first will notice that they are first of all, exactly same siege two groups. And moving on, we end up with our first difference. So we are comparing C H two versus C H C, right? Because carbon is bonded to another carbon. And in addition to that, if we want to compare all of our atoms bonded to those carbons, we can say that we are comparing C H which is bonded to two carbon atoms versus C H which is bonded to hydrogen and carbon. So definitely we are going to assign priority number two to our C H C C substituent and priority number three to our C H two C substitute within the ring. And now essentially if we track our path from 1 to 2 to three, we get an S rotation right counterclockwise. But since priority number four is pointing up, we have to reverse it. So that would actually be R right. Let's recall that according to the con engle pre rules, priority number four must be winding down. If it's winding up, we are reversing our configuration. So carbon number one would correspond to the R configuration. And similarly, we want to assign the configuration to carbon number three. Let's go ahead and add the implicit hydrogen atom. Let's immediately assign priority number four to hyen. And now we are comparing three carbon atoms. The best idea here would actually be to expand each substituent. So first of all, we have our isopropyl group right where carbon is bonded to two carbon atoms and one implicit hydrogen, then we have two C H two groups. So we're going to draw two S H two groups to begin with. We immediately noticed that the isopropyl group will be greater in priority. Since if we expand at least one of the C two groups, we will have carbon bonded to hydrogen bonded to another hydrogen and then moving on, we have another carbon. So we clearly see that if we get rid of the exactly same hydrogen atoms and the exactly same carbon atoms, we have a difference between carbon hydrogen bond and carbon carbon bond. So carbon gets a higher priority based on its atomic number so that the isopropyl group will get priority number one. And now what we want to do is just compare our rank substitutions. And just as we said, we have personal two siege two groups. So they're exactly the same. And then if we move on along our chain going down, we will have another siege two verses C H N, right. So we can say that on the left, we have C H two which is of course, later on bond to carbon. And then on the other side, we have c bonded to h bonded to nitrogen, which is later on bonded to the same carbon atom. And once again, if we exclude our ex, exactly same carbon atoms, exact same hydrogen atoms, we have a difference between nitrogen and hydrogen. So nitrogen gets a high priority based on its greater atomic number. So the right side of the rain gets priority number two actually. And the left side of the rain gets priority number three. Because hygiene is already pointing down, we can assign our rotation directly. And because it's clockwise rotation, we are saying that carbon number three has an R configuration as well. So let's go ahead and state that C three has an R configuration as well. Meaning we can now modify our name, including the required absolute configurations. We're going to use the previously written name and all that we have to do is just state and see that the first carbon atom has an R configuration. So that would be one R and then the third one also has an R configuration. So we're saying one R three R, we writing our numbers in a sending order. And then of course, we need to put a dash and finish our name by the substituent, followed by the parent. Therefore, we can conclude that the name of the given structure corresponds to one R three R three Isopropyl Cyclo Hean Amine. Thank you for watching.

Give an acceptable name for each amine.
(b)

Key Concepts

Amine Classification

Nomenclature of Amines

Cycloalkane Structure

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