Naming Alcohols - IUPAC Nomenclature

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[@stephenwumbo2681]

7:37 Why not 1-butanol-4-methoxy? (I haven’t watched preceding IUPAC nomenclature vids, so apologies for a dumb question)

[@dr.proteomix1257]

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.

[@TestimonyOtuya]

Can 2 propanol also be written as Propan-2-ol?

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[@stephenwa7417]

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?

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[@BenardOnchieku-ny5qc]

In 3,4 _ hexanol what if I call it hexan-3,4-diol

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[@broskie1]

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?

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[@broskie1]

@@NoraCGVK Nope

[@paysonkeown2960]

Hydroxyl takes priority, everything else is given the numbers based on giving the hydroxyl group the lowest number

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[@swingswang380]

Wait, ester has a higher priority than alkyne. The 5-methoxy-2-heptyne. Why the triple bond has a higher priority over methoxy?

[@rwayle]

That’s an ether, not an ester. Ethers do not have priority over triple bonds.

[@kesra1063]

How about the common names of cycloalkanol ?

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[@codyclark5441]

@the organic chemistry tutor - This video is great HOWEVER - the example @ 4:30 is 5-Bromo-1-hexanol, you miscounted the carbon chain !!

[@rwayle]

No you have, the chain is only 5 carbons long.

[@hfof]

@@rwayle Shouldn't we count the number of dots? or the segments ?

[@rwayle]

@@hfof ? you literally just count the number of carbons, he's numbered where they all are...

[@hfof]

@@rwayle I got it by thinking about it, thanks! I wonder what score did you get 2 months ago?

[@misturahayoola259]

@@rwayle I still don't get why it's 5 carbon chain instead of 6

[@mikeoxlong7607]

4:00 why there is only 5 carbon group? isn't it 6?

[@rwayle]

Definitely only 5

[@soulfreefreak]

OH is not a carbon so you don't count it as a carbon group

[@MohammedUsaid]

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

[@hfof]

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[@bestpess2023playerswithhighest]

So in naming ethyles and methyles do we use the one with the least number combined ??

[@gyurendakke1984]

Can’t the last example be 1-Ethyl-4-methylcyclohexan-2-ol?

[@rwayle]

No, because the alcohol has to be on carbon #1 when it’s a ring

[@yuzukeyt571]

wait I'm confused, why was the answer of the last example not following the alphabetical arrangement?

[@paysonkeown2960]

E is before m, and ethyl comes first here. It is alphabetically ordered

[@04chaewon]

wait wait wait... that can't be 2-methyl-2-pentanol ? i started counting the carbon where OH is connected

[@04chaewon]

oh wait nvm. i think you cant count it that way lol

[@syub2407]

can 2:17 be written as 2-methylpropan-2-ol

[@abenphilip4283]

yes, 2-methylpropan-2-ol is also correct. similarly, 2-Pentanol can be written as Pentan-2-ol.

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[@notop6528]

Can there be a OH and with alkanes or alkynes ?

[@essamhossam779]

what if there is cycloalkene attached to the (OH) group how can we name it

[@its.chris4324]

why in 3:37 is 3,4-hexanediol instead of 3,4-hexanol???

[@me._.sena_]

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

[@its.chris4324]

I do now! Thanks!

[@johannearribe8753]

What Is Oh Cl Oh?

[@syub2407]

how do we know when to put "e" or get rid of "e". from examples, you used pentan and hexan"e"

[@rachanakandukuri5396]

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.

[@_zyyt]

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?

[@minxxdia1132]

It's C2H5 - Ethyl..

[@mwasie]

That is an ethyl! If you saw that maybe it was a mistake or a misunderstanding on your part.

[@jeffreyhuang3814]

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.

[@mmarie-fu1dm]

Why is it cyclohexanol?

[@rwayle]

Because it's a cyclohexane ring with an alcohol group. cyclohexan ol

[@138.samiakhan]

9:31 Sir can we call this 2-Ethyl-5-Methyl-Fennel if its aromatic molecule?

[@yousifalani5707]

Phenol

[@RandomPerson-vs2yh]

what about naming phenols with double bonds. I need to know ortho, meta, and para...

[@nguyenangmai6212]

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)

[@venkatj7093]

How to write carbinol names

[@andrewfernandez2021]

What if there's more than one OH ?

[@rwayle]

Then it’s a diol or triol etc.

[@rhiditabham8164]

Hii, why did name the tertbutyl alcohol, propanol? Should It be butanol or am I missing something here?

[@krishnavamsi2030]

Rhidita Bham Propanol is the IUPAC name. Tertbutyl alcohol is the common name

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