Rmutt bro because not even more people are familier with this channel. Today i accidently find this channel quantum no video then asap i subscribe it first and share it amap
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”.
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.
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. =)
@@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
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!!
I SO appreciate your videos. They are top quality content. Your topics are focused and videos are just the right length. You are articulate and clear, and your examples further clarify any possible confusing circumstances that might arise in the topic you are lecturing on. Thank you, thank you, thank you!
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 UA-cam.
You saved me during my Class 10 board exams with your first 4 videos on Organic Chemistry . Now I gonna learn Organic Chemistry of Classes 11 and 12 and for JEE from you . I am entrusting my life to you . Please save me .
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
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.
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.
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 ❤❤
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
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?
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.
Every vid of yours are worth watching professor dave. I've learned a lot here, indeed thankyousomuch! More power & Godbless. You're such a great professor! 💞
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! 😇
the isopropryl substituent in the cyclic compound looks like isobutyl...How would you draw isobutyl in the this compounds ? Thanks. Excellent channel. Thanks
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.
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. 👍🏻
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
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.
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.
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:))
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.
I’ve got some FREE resources to help you ace OCHEM 1 this semester: chemmunity.info/dave
These are by far the best tutorials on IUPAC nomenclature, why dont you have more views?
+Rmutt gotta get the word out! please share with friends!
Rmutt bro because not even more people are familier with this channel. Today i accidently find this channel quantum no video then asap i subscribe it first and share it amap
@@ProfessorDaveExplains @ what about compounds with functional groups
Please explain them quickly
I guess not all dudes wanna learn cyclic compounds?
💥🙄
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”.
hmm, i'm wondering if these two methods could ever even yield different results in the first place?
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.
well good stuff, thanks for the tip!
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. =)
@@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
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!!
+Sammy El-Refee thanks kindly! spread the word!
During my undergrad degree, best prof in youtube. Still the best, pursuing my MA degree rn.
9 years ago ... DANMMMMM
Severely underrated
Thanks professor. You have indeed solved all the problems I have been experiencing in organic nomenclature since I joined A level
I SO appreciate your videos. They are top quality content. Your topics are focused and videos are just the right length. You are articulate and clear, and your examples further clarify any possible confusing circumstances that might arise in the topic you are lecturing on. Thank you, thank you, thank you!
You know you're actually one of the best examples of modern teachers! I'd love to be your student! Wait I am one already! That's cool!
stfu
Stfu
Stfu
Guys why does he need to shut up he did nothing wrong.
@@pastoryoda294 I think these replies were for some other reply to this comment
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
I would not survive AP Chem without your videos!
You always save me from my physics exams and now chemistry WOW. Thank you so much
Sir you look like Ranbir Kapoor 😻😍❤️
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 UA-cam.
The best tutorial to learn the IUPAC numbering for cyclic compounds>
Thanks sir Dave!
Love from India.
whole world will love you sir, with lots of love from your Indian student..... thanks a lot
Your videos make me love Science 💜
You saved me during my Class 10 board exams with your first 4 videos on Organic Chemistry . Now I gonna learn Organic Chemistry of Classes 11 and 12 and for JEE from you . I am entrusting my life to you . Please save me .
I love these classes!
hi dave you are seriously a god, thanks so much. you taught me more in a minute then my chemistry teacher did in 2 weeks thanks man
haha you're very welcome! feel free to email with questions!
your classes are awesome and they helped me a lot, and you are one of the best teacher i know.
Thanks professor Dave, still helping students after 7 years.
Thank you for the help professor jesus. I am able to pass my organic chemistry class now
Anyone else a college student learning more about Orgo here than in Lecture? Amazing videos!
We have an examination tomorrow about organic chemistry and this would be a helpful channel for us who are in the 9th grade
Thank you Professor Dave! Your videos are professional and always get straight to the point.
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
Wow for the first time in years i actually understand now. A big thanks!!!!!
Thank you sir you are the best teacher of chemistry and you are very nice
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.
In India we study this in grade 10th you are very helpful ❤
i M FROM INDIA ..love the way u simplify difficult concepts
professor dave , you cleared my all doubt , related to nomenclature.
I really like this professor. His teaching methods are exceptional. Thank you Sir
I can't understand why people dislike the videos when they can't understand even after watching these kinda awesome videos
Thank you so much proffesor
Your videos are very helpful
Love from India
thnx professor , i understood the whole nomenclature of cyclic compound , love from india
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.
you are a life savior!!!!
Good evening Sir 😊
I really glad to your tuition
Hi, I was wondering whether these nomenclatures accurate or not.
4-bromo-1-cyclohexene
3-ethyl-1-cyclopentanol
Yes thank you. I saved myself hours of comprehending modules.
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 ❤❤
Best tutorials ever❤
Love from India sir ❤
Isn't it OH? You wrote HO in previous video as well, but hydroxyl is OH right? What am I missing?
You must write it so that the oxygen is connected to the main chain.
@@ProfessorDaveExplains Ah, thanks. Im new to this.
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
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?
they're just different molecules! some linear some cyclic.
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.
contact me by email for this kind of stuff.
Wow, he just made chemistry sound fun
You just saved me from my professor's surprize quiz. Thank you Chemistry Jesus
Thank you sir 😊
Einstein use to say if u understand the topic you would explain it in a simple way it suits you professor..... 🤗🤗🤗🤗
Love you Professor Dave 🥺
Thank you Professor Dave
Every vid of yours are worth watching professor dave. I've learned a lot here, indeed thankyousomuch! More power & Godbless. You're such a great professor! 💞
So we don't include the substituents in the parent chain even if they could possibly lead to longer carbon chains?
I love ur classes sir ,it helps me a lot thanks....
If alcohol group and double bonds are present In a cyclic compound, for which we should give priority to?
i go to class for attendance only. 10q u prof. u r skillful
Nice human with nice information ♥️
Please do video on phenyl and benzyl group nomenclatures
one suggestion ...
plz upload complex compounds
Well explained
Thank you Prof Dave ! Helped me bunches =D
Seriously great stuff. You are GREAT at explaining that which has perplexed me!!
Really good 🤩
Thank you ❤️
sir love from india
Clear and concise.....thanx!
cool videos!! SIR. Professor Dave
Please explain me a lowest sum rule in 2-bromo-1-chloro-5-fluoro-3-iodo benzene
Aah tysm I didn’t listen to class twice this week cause they were online lectures and I couldn’t understand anything-
In 4-Bromocyclohexene why dont you choose the 2nd carbon as 1st and move clockwise so than you can write 3-Bromocycclohexene
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! 😇
the isopropryl substituent in the cyclic compound looks like isobutyl...How would you draw isobutyl in the this compounds ? Thanks. Excellent channel. Thanks
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.
3:12 Is it isopropyl or isobutyl???
that's an isopropyl group
Thank you so much professor dave❤
Hello. Dear Professor Dave. How do you named this compouns: cyclopentyl metoxy sodium. Please Help me.
Hi professor Dave. Why don’t you have a nomenclature lesson for other functionalgroups?
with the rest there's just so little to explain, you just memorize a new suffix and the rest is the same.
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. 👍🏻
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
How do we know whether OH is a hydroxyl substituent or an alchohol functional group?
It's always a hydroxyl substituent, an alcohol is a molecule with a hydroxyl substituent.
I got charity about numbering cyclic compounds with lowest rule....
Good thing is you have kept the video short....
Make maximum videos and
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.
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.
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:))
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
Can you help me find the isomers of dibromodichlorobenzene(how many isomers do it have). Thank you.
Thank you so much sir....... You are superb......
Professor, why do we have to take " 1-isopropyl" before "2-methyl"? "Methyl" comes alphabetically before "propyl".
isopropyl is one of those weird ones! it's I for isopropyl rather than P for propyl.
Professor Dave Explains, thank you very much!🤗😃😇
In one of the examples you have given.....why doesn't bromine have priority over the double bond??
alkene has priority over any alkyl or halogen.
So does it mean that for e.g. propane is C3H8 but cyclopropane is C3H6?
correct!
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)
+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.
The videos are so helpful and they are very superb
Thanks Professor Dave..... I'm from India.. Where's ur academy?
bro u are the absolute man and ur locks are goddamn luscious
Professor... I did't get you at 2:24!!! why didn't you mark ethyl as 1??
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.
@@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?
Thank you so much!! These videos are very helpful
Thank you is too small for your amazing explanation
Thank you so much.
Good
How do we know what to give prioritization to for the numbering ?
Both bromo and hydroxy are functional groups and functional groups' suffixes are used...so why did you write 4 bromo as a prefix..?
halogens do not utilize a suffix
@@ProfessorDaveExplains thankyou😇
Thank you
which would get higher priority if there are both alkene and alkyne in between there is some other functional group
Alkene is given more priority than to Alkyne