Naming Alcohols - IUPAC Nomenclature
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- Опубликовано: 27 авг 2024
- This organic chemistry video tutorial provides a basic introduction into naming alcohols using IUPAC Nomenclature. It includes alcohols with alkyl halides, alkenes, and cycloalkanes.
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IUPAC Nomenclature of Alkanes:
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7:37 Why not 1-butanol-4-methoxy?
(I haven’t watched preceding IUPAC nomenclature vids, so apologies for a dumb question)
It is because Methoxy is the substituent and butanol is the parent chain because it contains more carbons. Technically the parent chain is butane, but it is changed to butanol due to the -OH group. In IUPAC the substituent comes before the parent chain.
how come OH is always 1 on cycloalkanes, but depending on where it is located in a regular alkane its not always 1? Is it because theres only 2 ways to count on alkanes (left to right) but at least 6-12 ways to count on cycloalkane rings?
Exactly right!
Can 2 propanol also be written as Propan-2-ol?
Yes I believe so
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So in naming ethyles and methyles do we use the one with the least number combined ??
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4:00 why there is only 5 carbon group? isn't it 6?
Definitely only 5
OH is not a carbon so you don't count it as a carbon group
Pretty late reply, but, the last line is a representation of the bond between the last carbon atom to the OH group. The line may confuse you to think it's another carbon atom along with which OH is attached, but it is not
So,
/\/OH = Propanol, NOT Butanol
/\/\/OH = Pentanol , NOT Hexanol
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Hii, why did name the tertbutyl alcohol, propanol? Should It be butanol or am I missing something here?
Rhidita Bham
Propanol is the IUPAC name. Tertbutyl alcohol is the common name
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So in a structure consisting of an alkyl substituent, a double bond, a triple bond, a halogen substituent, a hydroxyl substituent and an alkoxy substituent all at different postions along the parent carbon chain, what will be the order of priorities when numbering the parent chain?
did u find out?
@@NoraCGVK Nope
Hydroxyl takes priority, everything else is given the numbers based on giving the hydroxyl group the lowest number
Wait, ester has a higher priority than alkyne. The 5-methoxy-2-heptyne. Why the triple bond has a higher priority over methoxy?
That’s an ether, not an ester. Ethers do not have priority over triple bonds.
How about the common names of cycloalkanol ?
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what if there is cycloalkene attached to the (OH) group how can we name it
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why in 3:37 is 3,4-hexanediol instead of 3,4-hexanol???
Because there are 2 hydroxyl groups(OH) and we name it like "ol" and di means "2" so that's why it is hexane di ol:) I hope u get it
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how do we know when to put "e" or get rid of "e". from examples, you used pentan and hexan"e"
If you have one hydroxy (-OH) group, you dont use the 'e'. For example, Butan-ol but I you have more thatn one hydroxy group, then you use and 'e' and specify the number of hydroxy groups you have by usingthe prefix di, tri, etc. before -ol. For example HO-H2C-CH2-OH would be Ethan'e'-1,2 diol.
can 2:17 be written as 2-methylpropan-2-ol
yes, 2-methylpropan-2-ol is also correct. similarly, 2-Pentanol can be written as Pentan-2-ol.
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Can’t the last example be 1-Ethyl-4-methylcyclohexan-2-ol?
No, because the alcohol has to be on carbon #1 when it’s a ring
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Can there be a OH and with alkanes or alkynes ?
In some of ur videos, CH2CH3 is methane while in this video at 8:54 u called it ethane so which one of these are correct?
It's C2H5 - Ethyl..
That is an ethyl! If you saw that maybe it was a mistake or a misunderstanding on your part.
Methane is CH4. Methyl is CH3. Methyl is methane without a hydrogen so it can form a single bond to attach to the molecule with the remaining electron on the carbon.
Ethane is C2H6. Ethyl is C2H5, or CH2CH3. Ethyl is ethane without a hydrogen so it can form a single bond to attach to the molecule with the remaining electron on the carbon.
When he called it ethyl he was right.
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9:31 Sir can we call this 2-Ethyl-5-Methyl-Fennel if its aromatic molecule?
Phenol
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what about naming phenols with double bonds. I need to know ortho, meta, and para...
ortho- is used when the substituent is right next to the OH- group
meta- is used when the substituent is 1 carbon away from the OH-
para- is used when the substituent is 2 carbons away from the OH- group (or opposite with the OH- group)
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What if there's more than one OH ?
Then it’s a diol or triol etc.
Why is it cyclohexanol?
Because it's a cyclohexane ring with an alcohol group. cyclohexan ol
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wait wait wait... that can't be 2-methyl-2-pentanol ? i started counting the carbon where OH is connected
oh wait nvm. i think you cant count it that way lol
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Is it still necessary to put 1 before pentanol?
Yes because without it you don’t know if it’s 1-pentanol, 2-pentanol or 3-pentanol
@@rwayle but our proff said that its okay if you don't mention the 1st position. Its understandable isn't?
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I don't think its a problem as if someone just says 'pentanol' they usually mean 1 pentanol
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At 1:43, can the compound (2-propanol) also be called 1-methyl ethanol?
Chereoge hi
If you come up with 1-methyl you probably haven't found the correct parent carbon chain. So in short no, you can't call it that.
no dear. Naming is done mainly by knowing the longest continuous carbon chain first which gives the parent name. Besides, in alcohols the OH group is given a number meaning it's a substituent but with your naming that means there's a methyl group as a substituent and it's on carbon 1.
@the organic chemistry tutor - This video is great HOWEVER - the example @ 4:30 is 5-Bromo-1-hexanol, you miscounted the carbon chain !!
No you have, the chain is only 5 carbons long.
@@rwayle Shouldn't we count the number of dots? or the segments ?
@@hfof ? you literally just count the number of carbons, he's numbered where they all are...
@@rwayle I got it by thinking about it, thanks! I wonder what score did you get 2 months ago?
@@rwayle I still don't get why it's 5 carbon chain instead of 6
3,4-hexadiol works? 3:35
The same question!
I’ve named it the way you did.
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