Write the IUPAC name for each of the following alcohols and phenols: (12.1)
c.

Question

Write the IUPAC name for each of the following alcohols and phenols: (12.1)

c.

Accepted Answer

Hi, everyone. Our next problem says, provide the Iupac name for this structure and we have a skeletal structure which is an alcal chain with an oh group. And our name possibilities are a one methyl propanol B four Pinol C two pinol or D one ethyl button. So let's think through our steps of naming a compound. We have a hydrocarbon chain and oh group. So we have just that one functional group and we have that oh group, we know we're going to have an alcohol. So we're going to add the ending to the Alcaine name. So to name our chain, we're going to need to find the longest carbon chain and count how many carbons. Well, this one's pretty obvious since we have just that there's no branches or anything like that to make this more complicated. So we just need to count the carbons which I'll highlight in blue. It's a skeletal structure. So they're the ends of the line segments. So 12345 carbons in our chain. So that would be a pen ta. So our name here will be Pinol and all that's left to do is we need to number the chain. And that's because our oh, could be located on different carbons here. If the oh, were the first one on the chain, we wouldn't need a number we'd assume it starts with. Oh, but we have one on one of our internal carbons. So we number that chain so that the substituents have the lowest possible numbers. We could start our numbering on either end of this chain. And in fact, it's tempting to number it left to right. But we want that oh group to have the lowest possible substituent number. So we'd start our numbering on the right side because that way roh group will just be on carbon two. So we number 12, there's our oh group 345. If we numbered the other direction, 1234, the oh group would be on carbon four. So that would be a higher number. So then we just add the number in front of our name. So we'd have two hyphen fentaNYL, we separate numbers of substituents by commas, separate numbers from letters with hyphens. So choice C is two pinol. So that's our answer. When we look at our other answer, choices, choice A says one methyl propanol. And that would be sort of, we consider this as having two branches and then ac oh as our, you know, sort of functional group in the middle, but that's not the way we name this. We want to name the longest continuous carbon chain. So we treat that carbon chain as one piece of five carbons. Choice B four fentaNYL would mean we numbered in the wrong order starting from the wrong end of the chain. So that's why that's incorrect. And then choice D one ethyl butanol that treats this carbon one as a separate substituent. But we remember that we want to name our longest carbon chain as a continuous chain, which is what we have here with our five carbons since they're all bonded together. So choice D also incorrect. So once again, our Iupac name for the structure, we're given this choice C two pinol. See you in the next video.

Write the IUPAC name for each of the following alcohols and phenols: (12.1)
c. <IMAGE>

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Key Concepts

IUPAC Nomenclature

Alcohols

Phenols