IUPAC Nomenclature of Cyclic Compounds

Look at the pretty shapes! One more bit of IUPAC nomenclature, this time for cyclic molecules. You know, like cyclohexane and what not.
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These are by far the best tutorials on IUPAC nomenclature, why dont you have more views?

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+Rmutt gotta get the word out! please share with friends!

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@@ProfessorDaveExplains @ what about compounds with functional groups Please explain them quickly

[@l.lawliet1551]

I guess not all dudes wanna learn cyclic compounds?

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Just chain watched all of your IUPAC nomenclature videos. Best most comprehensive tutorials available on YT. I saw some other videos before yours and they weren't even half as comprehensive. Thank you so much! I have subscribed to you as you are excellent!!

[@ProfessorDaveExplains]

+Sammy El-Refee thanks kindly! spread the word!

[@TheRok]

Thank you for sharing this, Professor Dave. It might be worth it in another video or so, to clarify to the audience and students that the “lowest set of locants” does *not* mean the set of locants with the lowest sum, but it means the set of locants with the lowest number at the first point of difference. Meaning, in this example 2:41, we compare two sets going in opposite directions: 1,4,6 1,2,4 The set “1,2,4” wins, or is the correct one, because after we skip both 1s in the sets, as they're the same, the first point of difference is between 4 and 2 above each other; 2 is lower, so its set wins, or is the correct one to use, *even* if that set's sum is higher than another set's sum! This is very important for students to know and understand, and lots of them get it wrong when they hear the title of the rule, “lowest set of locants”.

[@ProfessorDaveExplains]

hmm, i'm wondering if these two methods could ever even yield different results in the first place?

[@TheRok]

Professor Dave Explains Yes, Professor Dave, they do yield different results sometimes. More precisely, sometimes the sum of the locants leads to the wrong answer while the lower at the first point of difference leads to the correct one. Dr. Ian Hunt, from the Department of Chemistry, University of Calgary, wrote an article about this titled *Don't sum locants!* The article lists some examples of when the sum misleads.

[@ProfessorDaveExplains]

well good stuff, thanks for the tip!

[@TheRok]

Professor Dave Explains You're most welcome. And thank you for sharing all these lectures; it helps a lot. And what I mentioned is a drop in the sea of those lectures. =)

[@vrmagics-rishan7990]

@@ProfessorDaveExplains yes prof dave they yield different results in the case of a trimethyl decane to be more precise consider this 2,7,8trimethyldecane and 3,4,9trimethyldecane and use both methods for both compounds they yield diff results but first one is considered to be correct so as ocatants rule

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@@pastoryoda294 I think these replies were for some other reply to this comment

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I've been searching for a video to explain IUPAC Nomenclature with multiple substituents and you sir made it clear and easy!!! definitely earned a sub

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Thanks professor. You have indeed solved all the problems I have been experiencing in organic nomenclature since I joined A level

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[@songohan393]

Amazing video, could you do one more video about IUPAC of more complex cyclos? maybe with 2 doubble bonds, 3 doubble bonds, combined with triple bonds, combined with another phenyl. Probably a video where you have already written 10 molecules and then you name it with us.

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I would not survive AP Chem without your videos!

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thank you so much. This is such an awesome tutorial, i like the quality (good image and clear sound).Also, it's great that you explain things in details. please do more tutorial on nomenclature for more complicated compounds. im looking for it

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[@ProfessorDaveExplains]

haha you're very welcome! feel free to email with questions!

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[@athickie]

Hi Prof. Dave! What determine whether the carbon chain forms a ring or not? Since the smallest ring is a 3 carbon chain, why is it that sometimes it's a straight chain and others it's a ring? Or is that just when the chain has substituents?

[@ProfessorDaveExplains]

they're just different molecules! some linear some cyclic.

[@liandremeuter]

Wow for the first time in years i actually understand now. A big thanks!!!!!

[@thej680]

Let's say I were to label a linear alkene with a double bond between carbons 1 and 2, and I had a halogen somewhere else. Couldn't I do the same nomenclature you used for the 4-bromocyclohexene? For instance, an alkene such as 4-fluorohexene implying a double bond between carbons 1 and 2, and implicitly states being linear due to the absence of "cyclo" being in the molecular name. Also explicitly stating that it has a parent 6 carbon alkane. Also, I would like to say that this actually explains the nomenclature better than the place I was looking. The presentation of nomenclature heads-first explaining each individual rule is better instead of explaining the molecule's instability due to the rotation of an alkyl group in relation to another alkyl group(I was reading about what the thing called the Newman's Projection or it referred to this instability of the molecule as being staggered) at the same time as addressing the nomenclature. I am not taking classes on this stuff, but I will in the future, so I studied up. I managed to get through general chemistry in the space of four days.

[@ProfessorDaveExplains]

well, it's true that in that precise example you mentioned we would know where the double bond is either way, but typically we can consider the position of the double bond ambiguous unless we state it, so we always do.

[@Chay-4o]

The best tutorial to learn the IUPAC numbering for cyclic compounds> Thanks sir Dave! Love from India.

[@harshihash1569]

Please do video on phenyl and benzyl group nomenclatures

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[@Paraselene_Tao]

lol, I took an undergrad O Chem class and we didn't even deal with this "lowest set of locants" rule. I think it's great that IUPAC has a way to end up with the same name every time. I'm here laughing at how my college class didn't bother to explain this, yet here you are explaining it perfectly for everyone to see on KZbin.

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[@user-zi5fl5pp2j]

Sir, I have a doubt- For eg in 2 Bromo carbonyl-4 cyclo propoxy carbonyl cyclohexane carboxylic acid, is 'c' in cyclo propoxy also written in alphabetical order? Like b in bromo comes before c in cyclo

[@janxli695]

Hi, I was wondering whether these nomenclatures accurate or not. 4-bromo-1-cyclohexene 3-ethyl-1-cyclopentanol

[@MrDzoni955]

Isn't it OH? You wrote HO in previous video as well, but hydroxyl is OH right? What am I missing?

[@ProfessorDaveExplains]

You must write it so that the oxygen is connected to the main chain.

[@MrDzoni955]

@@ProfessorDaveExplains Ah, thanks. Im new to this.

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Anyone else a college student learning more about Orgo here than in Lecture? Amazing videos!

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[@abdulkhadarainur4348]

So we don't include the substituents in the parent chain even if they could possibly lead to longer carbon chains?

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Wow, my head is still spinning but this is by far the best example of IUPAC rules with some great examples. Since we all have to "shelter in place" for this corona virus, I'm taking an online Chem class, and the textbook gives the most basic and least complex examples. So, thank you thank you thank you for these videos. I haven't taken a chem class since high school and that was many years ago.

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[@qwertypoiu6156]

Professor Dave Explains For the last one why did you not put -1- before the ol? Or is it not necessary? Because you put -1- before the ol in the previous video! Thks:))

[@ProfessorDaveExplains]

on a cyclic compound the carbon that bears the hydroxyl is assumed to be carbon 1, you only need to specify on a linear alcohol

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thnx professor , i understood the whole nomenclature of cyclic compound , love from india

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Best tutorials ever❤

[@anonymous_yeti7279]

How do we know whether OH is a hydroxyl substituent or an alchohol functional group?

[@ProfessorDaveExplains]

It's always a hydroxyl substituent, an alcohol is a molecule with a hydroxyl substituent.

[@kamleshkumari6975]

Please clear my doubt 🙏🙏 Case 1 : If it is a linear organic compound, then if it's chain is containing a(i) ethyl and (ii) two branched methyl ( on the same carbon ) , then lower numbering is given to ethyl ( according to the alphabetical order ) .... Case 2 : If it is a cyclic organic compound (in the form of hexane ) , then if it's chain is containing a(i) ethyl and (ii) two branched methyl ( on the same carbon ) , then lower numbering is given to the carbon containing the branched methyl.... WHY IS IT DIFFERENT HERE ??? Please clear my doubt 😭😭....i would be really grateful.....BTW love your videos and your way of teaching ❤❤

[@curtpiazza1688]

Clear and concise.....thanx!

[@rajeshannamdevula1893]

Do isomers have different physical and chemical properties? If So why sir?

[@ProfessorDaveExplains]

depends what type of isomers, structural isomers can have dramatically different properties. stereoisomers can too, it depends on the situation. usually something like a pair of enantiomers ought to have precisely identical physical properties, except for the way they rotate plane-polarized light, but certain kinds of chemical properties can be different.

[@sacky2583]

Thank you so much professor dave❤

[@divyammadhok9446]

So does it mean that for e.g. propane is C3H8 but cyclopropane is C3H6?

[@ProfessorDaveExplains]

correct!

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Thank you so much!! These videos are very helpful

[@Papislayer69]

Could you have given the isopropyl the value of carbon 4 instead of carbon 1 ? (Ex. Minute 3.31, 4-ethly-1-isoproply-2-methly cyclohexane)

[@ProfessorDaveExplains]

+Abraham Morales nope, that would make it 1,3,4! 1+3+4 = 8 which is more than 1+2+4 = 7, so it wouldn't be the lowest set of locants.

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[@sanskritibhalse9064]

Both bromo and hydroxy are functional groups and functional groups' suffixes are used...so why did you write 4 bromo as a prefix..?

[@ProfessorDaveExplains]

halogens do not utilize a suffix

[@sanskritibhalse9064]

@@ProfessorDaveExplains thankyou😇

[@sweetzcv9373]

Your organic chemistry tutorials are so helpful Professor Dave 😊 thank you so much..I kinda wonder if you have any tutorials about naming cycloalkynes? Because usually on youtube i don't even see any clear demonstration in naming particularly cycloalkynes

[@ProfessorDaveExplains]

that would be this one here

[@sweetzcv9373]

@@ProfessorDaveExplains thank you sir but do you have other more examples regarding cycloalkynes? 😅 im kinda confused on how to name a cycloalkyne compound with 1 triple bond and 3 substituents, like does it changed the name of the structure of a cyclic compound?

[@ProfessorDaveExplains]

it's all the exact same rules outline here, doesn't matter how many substituents

[@sweetzcv9373]

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[@bryanlim7355]

7. Propose a chemical reaction that can differentiate between alkenes and alkynes. 8. Draw chemical structure of the product formed through the addition of methanamine to hexanoyl-chloride. 9. Explain why p-methyl-phenol will be more preferred than o¬-methyl-phenol as the major product in the aromatic substitution reaction of phenol and chloro-methane.

[@ProfessorDaveExplains]

contact me by email for this kind of stuff.

[@lejoub21]

the isopropryl substituent in the cyclic compound looks like isobutyl...How would you draw isobutyl in the this compounds ? Thanks. Excellent channel. Thanks

[@sisyphus645]

Isobutyl looks like a trident. It has three heads connected to one. It's like a methane molecule except replace 3 of the hydrogens with methyl groups and the 4th hydrogen with the parent chain.

[@Ava-fx4ip]

Professor... I did't get you at 2:24!!! why didn't you mark ethyl as 1??

[@ProfessorDaveExplains]

because we need the lowest set of locants! that would be 1, 2, 4. if the ethyl carbon was 1, it would have to be 1, 3, 4 which isn't the lowest set possible.

[@mateuszrazniewski163]

@@ProfessorDaveExplains then what if all carbons from 1 to 4 had substituents? The set would be 1,2,3,4. What is the priority in such case?

[@priscilacavalcante7677]

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[@Sakthivel-mr6ep]

Please explain me a lowest sum rule in 2-bromo-1-chloro-5-fluoro-3-iodo benzene

[@shreeshailkanakal5612]

In one of the examples you have given.....why doesn't bromine have priority over the double bond??

[@ProfessorDaveExplains]

alkene has priority over any alkyl or halogen.

[@ibosinger4162]

Nice human with nice information ♥️

[@eshanika549]

3:24 Why do we write isopropyl instead of propyl?

[@flaminggamer7703]

In 4-Bromocyclohexene why dont you choose the 2nd carbon as 1st and move clockwise so than you can write 3-Bromocycclohexene

[@craftideasbyniru6265]

Hey! As the double bond lies between two carbons, we have to give more priority to those 2 carbons participating in the double bond and hence carbon 1 & carbon 2. If we take 2nd carbon as 1st and move clockwise, the other carbon becomes 6 which is not possible as we have to give more priority to both the carbons. Hence, the ans is 4 bromo Hope it helps mate! 😇

[@Aryan_editK]

Professor, why do we have to take " 1-isopropyl" before "2-methyl"? "Methyl" comes alphabetically before "propyl".

[@ProfessorDaveExplains]

isopropyl is one of those weird ones! it's I for isopropyl rather than P for propyl.

[@Aryan_editK]

Professor Dave Explains, thank you very much!🤗😃😇

[@AronOut]

what if there is a cyclic compound branched on a cyclic compound?

[@ProfessorDaveExplains]

+Aron Balines depends on the situation! but cyclic alkanes can be named like alkyl substituents. like say, cyclopropylcyclohexane.

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In India we study this in grade 10th you are very helpful ❤

[@DebapriyaDebnath-hy3qz]

Thanks Professor Dave..... I'm from India.. Where's ur academy?

[@gerald7188]

Professor dave explains from 03:32 how is it 4-ethyl

[@ProfessorDaveExplains]

the ethyl is on carbon 4!

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Good

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[@yarapureddy6994]

Well explained

[@lorencechavez]

Hi professor Dave. Why don’t you have a nomenclature lesson for other functionalgroups?

[@ProfessorDaveExplains]

with the rest there's just so little to explain, you just memorize a new suffix and the rest is the same.

[@lorencechavez]

I see then. I am just curious about the level of priority like in the case of hydroxy and other hydrocarbons. Say I encountered a molecule where all of the functional groups are present. Is there a hierarchy for the constituents to follow? By the way, you respond so fast. 👍🏻

[@ProfessorDaveExplains]

yep there is a hierarchy for functional group priority, most chemists don't even really have it memorized since it doesn't come up much and is easy to look up

[@yasmeenmallick2666]

You are awsm sir... Ur explanation is toooo good.. Thnku sir

[@deetshanasubramaniam6679]

Hi professor.. your videos are really cool..Can you please say when benzene can be used as a substituent or when it can be in parent chain

[@ProfessorDaveExplains]

it can be either! depends on the situation. if a benzene ring is a substituent it's called "phenyl".

[@rajeshannamdevula1893]

Sir why only organic compounds exhibit isomerism?

[@ProfessorDaveExplains]

inorganic ones can too, like coordinate covalent compounds, depending on the ligands you can have things like cis and trans isomers

[@hawrrahawrra6386]

Thank you so much.❤️

[@minimahalakshmi5984]

3:12 Is it isopropyl or isobutyl???

[@ProfessorDaveExplains]

that's an isopropyl group

[@Stephen__tari]

Thank you so much.

[@theashow3387]

which would get higher priority if there are both alkene and alkyne in between there is some other functional group

[@craftideasbyniru6265]

Alkene is given more priority than to Alkyne

[@anon551]

prof Dave, could you do I video on iupac nomenclature of heterocyclic compounds as well??

[@fuad951357]

i can't understand , (in the 6:22) you said 3-methylcyclopentanol, why you said Pent? for the first look, it will 3-methylcyclohexane

[@ProfessorDaveExplains]

that's a five membered ring with a two carbon substituent.

[@shirishabhupathi7344]

Who did we get isopropyl 3:07

[@moalergraher8045]

Can you help me find the isomers of dibromodichlorobenzene(how many isomers do it have). Thank you.

[@chenni4127]

How do we know what to give prioritization to for the numbering ?