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.

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[@SquatSimp]

Abrupt ending but very helpful, thank you.

[@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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[@TheApostleofHealing]

Awesome video, thanks man.

[@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.

[@judyamr7663]

Fascinating ❤

[@stephenwa7417]

great video, it all makes sense

[@TestimonyOtuya]

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

[@isaaclai1636]

Yes I believe so

[@nezukochan471]

yup

[@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!

[@138.samiakhan]

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

[@yousifalani5707]

Phenol

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[@_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.

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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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3,4-hexadiol works? 3:35

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

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[@BenardOnchieku-ny5qc]

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

[@GisliNairs]

It's still correct!!

[@notop6528]

Can there be a OH and with alkanes or alkynes ?

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[@chereoge]

At 1:43, can the compound (2-propanol) also be called 1-methyl ethanol?

[@alokgupta5678]

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[@rwayle]

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.

[@abenaredemption2353]

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.

[@kesra1063]

How about the common names of cycloalkanol ?

[@samiiramohamedabuubakar8759]

Thnks teacher 😘 ❤

[@essamhossam779]

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

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Thank you (Fri 18 Dec 2020, 5:21 PM)

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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?

[@NoraCGVK]

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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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[@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

[@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)

[@douglaszaloumis6494]

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[@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.

[@edwin.arevalo2002]

I'm a little confused, but I got the spirit.

[@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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[@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.

[@dalyaj1764]

Thank you🤍

[@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

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[@blablablablaaa]

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[@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

[@andrewfernandez2021]

What if there's more than one OH ?

[@rwayle]

Then it’s a diol or triol etc.

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[@aubreymacasinag1340]

Is it still necessary to put 1 before pentanol?

[@rwayle]

Yes because without it you don’t know if it’s 1-pentanol, 2-pentanol or 3-pentanol

[@abial7138]

@@rwayle but our proff said that its okay if you don't mention the 1st position. Its understandable isn't?

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@@abial7138 Yes , it is . Our prof. Said that too.

[@chillingguy198]

I don't think its a problem as if someone just says 'pentanol' they usually mean 1 pentanol

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[@mmarie-fu1dm]

Why is it cyclohexanol?

[@rwayle]

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

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