IUPAC Nomenclature of Alkenes and Alkynes
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- Опубликовано: 26 июл 2024
- More IUPAC nomenclature! Now let's look at molecules with carbon-carbon double and triple bonds. We will look at alkynes of alkenes. Get it?
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4:43 Professor Dave I think that the higher priority would be given to a double bond rather than a triple bond while naming a compound with a double bond and a triple bond at the same position from either side. Please solve my ambiguity! Also your teaching style is awesome and far better than the IIT JEE tutions here in India!
Yeah dude! The priority goes to the double bond first! Then comes triple bond and then single bond!
@@alitornado2
The correct answer is both.
This video is slightly dated on its naming conventions.
With some new IUPAC conventions since this video came out 7 years ago, we treat the en and yne suffixs the same way he treats the alcohol suffix in this video, except stacked in the same name, ill show you below.
Additionally because of this change, we don't use "#-(carbons)(ene)" anymore. e.g "3-ethene"
If we want to specify the position of a double bond in ethene, we input a space into the name, for instance, "2-chloro eth-1-ene". This also allows us to use stereochemistry modifiers E and Z to signify cis and trans double or triple bonds like this, "3-chloro pent-1(Z)-yne", a 5 carbon chain with a chlorine on the third carbon, and that has a bent first carbon on a triple bond at the number 1 carbon.
To answer your question though.
An actual name of a six carbon chain with a double and triple bond on the ends is "hex-1(E/Z)-en-6(E/Z)-yne". Where the E/Z considers the stereochemistry of the bond *e.g whether the first/last carbon is on the same side or opposite side from carbon #3 / #4 respectively.
You can consult some various sources for this on the new Blue Book rules but I used this one.
www.masterorganicchemistry.com/2011/02/14/table-of-functional-group-priorities-for-nomenclature/
@@CabbageSandwich hello, i have a query regarding the same, if a triple bond is closer than the double bond, then from which way the numbering should start?
IUPAC convention is that naming would start from the end closer to the triple bond. depending on exactly what you mean here.
I think double bound should be given higher priority .I just watch a video where it was given
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I was confused what happens if the double or triple bond is not on the longest chain. As far as I understand from a quick search, it's the longest chain containing the double or triple bond which is used for numbering.
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just remember guys that the priority order for lowest occurance and in the selection of the principal carbon chain is Functional group (like OH, COOH, etc...) > unsaturated bond (double and triple bond)> Longest carbon chain (number of carbon atoms) > substituent groups (like F, Cl, Br, I, methyl, ethyl, etc...)
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At 6: 23 prof Dave is flicking his luscious hair
You are best prof please sir I wish to ask if it's hept-3-yne or 3-heptene I love you sir God bless you
Me gets in front of the class: "its 5-chloro-3-ethyllll*mumblemumblemumble*-ol
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Love your work man! But our professor told us Alkynes have the lowest priority..
Now this has two longest carbon chains so why isn't this 5-chloro-4-methyl-3-hepten-3-ethanol?(Or 5-chloro-3-ethaanol-4-methyl-3heptene)?
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5:51
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Regarding to that 1 on pente-1-nol in your next video of cyclic compounds you said it is implied that the hydroxyl group is on carbon1 thereby not writing the 1 on the final answer but here you wrote it there may i get to understand why?is it because that one was a cyclic and this one isn't....am confused now about numbering compounds with functional groups 😭
I have a question: If that was an alkyne instead of an alkene at the end, would the suffix be "butyn-1-ol"? instead of "butyne-1-ol"?
Other sources are saying that alkenes and alkynes have the same priority but priority is given to alkenes for alphabetization in the event of a tie. I may have misread them.
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an OH is a hydroxyl group, and a molecule with a hydroxyl group is called an alcohol
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Sir is it still necessary that you will put 1 before pentene?
I also wanted to ask-- why are we not including Z/E stereoisomerism in this IUPAC name?
the -ane -ene -yne suffixes in phonetical languages are somewhat mixed up. Alkan Alken Alkin (respec.) is what it would sound like in slavic forms and would not directly correspond to EN pronunciation.
also, different languages (non-roman) would have the alphabetical order slightly altered , so I guess IUPAC also corresponds to language conversion or needs to be adjusted to its EN form
Is it still okay if the suffix is hept-3-en-1-ol?
professor Dave what if there an alkene and an alkyne together in the compound what do we do ??????
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Why did you use the dash and hash (whatever it is) in place of actual methyl line representing the Methyls in the first formula of Alkenes?
check out the first tutorial in this organic chemistry playlist, it explains the dash and wedge notation
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4:28 why the upper one?
Why not the one under it?