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The founding fathers of organic chemistry are really proud of you You're the only one that doesn't overcomplicate the principles of science You explain it the way it's supposed to be explained
I remember spending 3 years in a tutorial class and not understanding anything..... But your lectures actually made science easy.... And life easy.... Thanks a lot
Why is it that the school(s) professors are making chemistry difficult and confusing? You are the kind of chemistry prof we want in the colleges/universities, you make concepts so clear to understand for even a first time learner. They let us think like our heads are upside down...Thnx and God bless u
A lot comes back to the bad administration of schools. More concerned with protecting the old arbitrary academic systems then they are with the exchange of knowledge.
Just a note for those watching that in recent years, that "Preferred IUPAC Name" (PIN) has changed some of the IUPAC naming conventions to further limit ambiguity about how the molecules are named. For example, 1-pentanol is now pentan-1-ol. Similarly, 3-penten-1-ol would be called pent-3-en-1-ol.
Oh my.....These series of videos are extremely helpful... thank you so much for those videos. Your explanation is just super clear and I now start to love o-chem because of your videos. Thank you Professor. Dave!!!!
4:43 Professor Dave I think that the higher priority would be given to a double bond rather than a triple bond while naming a compound with a double bond and a triple bond at the same position from either side. Please solve my ambiguity! Also your teaching style is awesome and far better than the IIT JEE tutions here in India!
@@alitornado2 The correct answer is both. This video is slightly dated on its naming conventions. With some new IUPAC conventions since this video came out 7 years ago, we treat the en and yne suffixs the same way he treats the alcohol suffix in this video, except stacked in the same name, ill show you below. Additionally because of this change, we don't use "#-(carbons)(ene)" anymore. e.g "3-ethene" If we want to specify the position of a double bond in ethene, we input a space into the name, for instance, "2-chloro eth-1-ene". This also allows us to use stereochemistry modifiers E and Z to signify cis and trans double or triple bonds like this, "3-chloro pent-1(Z)-yne", a 5 carbon chain with a chlorine on the third carbon, and that has a bent first carbon on a triple bond at the number 1 carbon. To answer your question though. An actual name of a six carbon chain with a double and triple bond on the ends is "hex-1(E/Z)-en-6(E/Z)-yne". Where the E/Z considers the stereochemistry of the bond *e.g whether the first/last carbon is on the same side or opposite side from carbon #3 / #4 respectively. You can consult some various sources for this on the new Blue Book rules but I used this one. www.masterorganicchemistry.com/2011/02/14/table-of-functional-group-priorities-for-nomenclature/
@@CabbageSandwich hello, i have a query regarding the same, if a triple bond is closer than the double bond, then from which way the numbering should start?
With these videos, I could understand organic chemistry easily and engage interestingly in my natural products projects. Dave! You made life live. You're the one thst should win the nobel prize for education.
Enjoying the videos so far. I was confused what happens if the double or triple bond is not on the longest chain. As far as I understand from a quick search, it's the longest chain containing the double or triple bond which is used for numbering.
just remember guys that the priority order for lowest occurance and in the selection of the principal carbon chain is Functional group (like OH, COOH, etc...) > unsaturated bond (double and triple bond)> Longest carbon chain (number of carbon atoms) > substituent groups (like F, Cl, Br, I, methyl, ethyl, etc...)
@6:15 Why don't we use the "ene" at the End instead of alcohol ? If the Alcohol Group Takes Priority then shouldn't it be First? i.e, 5-chloro-3-ethyl-4-methyl-3-heptanol-3-ene
+Abdullah Rai hydroxyls take priority over alkenes and alkynes both in terms of numbering the carbon chain and naming the molecule, so the ol has to go at the end rather than the ene. priority will mean that it is the last thing that is named, implying that it is the functional group that most strongly contributes to the nature and reactivity of the molecule.
Other sources are saying that alkenes and alkynes have the same priority but priority is given to alkenes for alphabetization in the event of a tie. I may have misread them.
4:46 If you took the two Carbon atoms below the Hydroxyl group for the main chain, the main chain would also be made up of 7 carbon atoms. Why is one taken over the other as a main chain? 🤔
I would have a question : in the example at 4:10 what makes us choose the top path? Is there a rule about chosing a path that minimize the number of bonds in the substituants? With the same example taking the lower path would mean that the group would be 3 bonds long while taking the top one makes a 2 bond group. Am I extrapolating this correctly? Or maybe there is a rule that state that family modifiers must be attached to the main chain, forcing to choose the path with the hydroxyl group. In case the bottom path is valid what would be the name of this thing?
Quick question. In the Alkene example you labled the substituent double bond 1-1-pentene. How come on this one it is not 3-3-3-heptyne, and it's just 3-heptyne?
Awesome! Ok thank you. I was confused for a second. Can I just say I am loving your Ochem videos. I haven't taken this course yet but am prepping for my MCAT so in addition to my Kaplan test prep materials I am using this as a supplement. It is way easier to understand from you, and honestly it seems like Ochem is going to be fun. Never thought I would ever say that lol.
You are a amazing teacher for children. You have pretty much explained everything. Your videos have benefited me and my friends greatly and i would love to have more of your videos. Please tell me about plus two chapter 9 coordination compound. Plzz arrgenttly my board exam in 2020 march .
Hi Prof. Dave. I wanted to ask, can we start by numbering the chain from the carbon that's below the alcohol (The one you called 3-ethyl), instead of the one that's right next to it?
the -ane -ene -yne suffixes in phonetical languages are somewhat mixed up. Alkan Alken Alkin (respec.) is what it would sound like in slavic forms and would not directly correspond to EN pronunciation. also, different languages (non-roman) would have the alphabetical order slightly altered , so I guess IUPAC also corresponds to language conversion or needs to be adjusted to its EN form
Prof Dave, @6:22, because of the double bond, would we be expected to write this as cis-5-chloro-3-ethyl-4-methyl-hepten-1-ol? or is there a reason we don't need to identify the cis/trans conformation?
I don't understand why you identify the longest carbon chain starting with the end that had the hydroxyl group and not with the one that ends in a carbon. Both would have given you a 7 carbon molecule. Can you elaborate please?
I had a problem on a test that I didn't understand when naming. The compound is 4-chloro-1-methyl-2-propylcyclohexane. Why does the count in counting the carbon chain starts with the methyl and not the chlorine? I thought since Chlorine not being a carbon chain would take priority in naming, then I would counts backwards making the propyl third and the methyl fourth. Could you explain why the priority. Thanks. Love watching your videos.
COOH gets highest priority. Then CHO, and in the end OH. numbering will be done in such a way that COOH gets lowest possible no. for example 3-hydroxy, 5-oxo- pentanoic acid
Regarding to that 1 on pente-1-nol in your next video of cyclic compounds you said it is implied that the hydroxyl group is on carbon1 thereby not writing the 1 on the final answer but here you wrote it there may i get to understand why?is it because that one was a cyclic and this one isn't....am confused now about numbering compounds with functional groups 😭
in the last example Why didn’t we identify the main and longest chain in a way which it would be horizontal because it is the same length (made up of 7 carbon atoms) ?
Can I write 4,4-dimehtyl pent-1-ene, or does it have to be 4,4-dimehtyl-1-pentene? I also did 6-iodo hexan-3-ol instead of 6-iodo-3-hexanol. Is that correct? Please only comment if you are an expert in this. Thanks!
Hello sir! Love your teachings always, it is much easier and clearer than my profs at school who makes it more difficult to understand. Anyways i do have one question to clarify. Aren''t alcohols termed as OH? 😶
Get exam-ready with my 12 OChem practice exams available only on Chemmunity: chemmunity.info/dave
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The founding fathers of organic chemistry are really proud of you
You're the only one that doesn't overcomplicate the principles of science
You explain it the way it's supposed to be explained
Thanks!
I remember spending 3 years in a tutorial class and not understanding anything..... But your lectures actually made science easy.... And life easy.... Thanks a lot
Why is it that the school(s) professors are making chemistry difficult and confusing? You are the kind of chemistry prof we want in the colleges/universities, you make concepts so clear to understand for even a first time learner. They let us think like our heads are upside down...Thnx and God bless u
You make us understand in minutes and they confused us for hours...LoL
Lol,also had d same experience guys
A lot comes back to the bad administration of schools. More concerned with protecting the old arbitrary academic systems then they are with the exchange of knowledge.
a
Just a note for those watching that in recent years, that "Preferred IUPAC Name" (PIN) has changed some of the IUPAC naming conventions to further limit ambiguity about how the molecules are named.
For example, 1-pentanol is now pentan-1-ol. Similarly, 3-penten-1-ol would be called pent-3-en-1-ol.
Oh my.....These series of videos are extremely helpful... thank you so much for those videos. Your explanation is just super clear and I now start to love o-chem because of your videos. Thank you Professor. Dave!!!!
The 28 dislikes are teachers who lost their jobs after students started watching Professor Dave instead of attending their classes .
FRR
Their*
Totally agree with you
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Yeah.......😊😊😊😊
Best teacher ever , never knew some one could teach this well . Thanks man , god bless you . Keep up the good work .
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YOU ARE SAVING MY LIFE RIGHT NOW. My professor just taught me this and I understood nothing. You explained in minutes and its so clear now. THANK YOU!
I just want to say thank you for all your videos. With your help, I was able to not only pass organic chemistry but also get an ‘A’ in it.
4:43 Professor Dave I think that the higher priority would be given to a double bond rather than a triple bond while naming a compound with a double bond and a triple bond at the same position from either side. Please solve my ambiguity! Also your teaching style is awesome and far better than the IIT JEE tutions here in India!
Yeah dude! The priority goes to the double bond first! Then comes triple bond and then single bond!
@@alitornado2
The correct answer is both.
This video is slightly dated on its naming conventions.
With some new IUPAC conventions since this video came out 7 years ago, we treat the en and yne suffixs the same way he treats the alcohol suffix in this video, except stacked in the same name, ill show you below.
Additionally because of this change, we don't use "#-(carbons)(ene)" anymore. e.g "3-ethene"
If we want to specify the position of a double bond in ethene, we input a space into the name, for instance, "2-chloro eth-1-ene". This also allows us to use stereochemistry modifiers E and Z to signify cis and trans double or triple bonds like this, "3-chloro pent-1(Z)-yne", a 5 carbon chain with a chlorine on the third carbon, and that has a bent first carbon on a triple bond at the number 1 carbon.
To answer your question though.
An actual name of a six carbon chain with a double and triple bond on the ends is "hex-1(E/Z)-en-6(E/Z)-yne". Where the E/Z considers the stereochemistry of the bond *e.g whether the first/last carbon is on the same side or opposite side from carbon #3 / #4 respectively.
You can consult some various sources for this on the new Blue Book rules but I used this one.
www.masterorganicchemistry.com/2011/02/14/table-of-functional-group-priorities-for-nomenclature/
@@CabbageSandwich hello, i have a query regarding the same, if a triple bond is closer than the double bond, then from which way the numbering should start?
IUPAC convention is that naming would start from the end closer to the triple bond. depending on exactly what you mean here.
I think double bound should be given higher priority .I just watch a video where it was given
Thank you sir for making these great Videos. I learn a lot even though im not a native english speaker. =)
With these videos, I could understand organic chemistry easily and engage interestingly in my natural products projects. Dave! You made life live. You're the one thst should win the nobel prize for education.
Enjoying the videos so far.
I was confused what happens if the double or triple bond is not on the longest chain. As far as I understand from a quick search, it's the longest chain containing the double or triple bond which is used for numbering.
You dont know but you really helped me a lot.
THANK YOU SO MUCH PROF.
Thank you for making me understand organic chemistry
Congratulations for 1 million sir
Saying thank you is not enough for such a great teacher like yourself .thanks a lot.
prof dave single handedly helping my grades in science
you are an amazing teacher! I'm taking organic chem in 12th grade rn.. thank you so much
Video I see, video I like, thank you Dave
Thank you, Professor Dave, thanks to you I can learn Alkynes of useful stuff.
I don't enjoy chemistry, but he just makes it so interesting.
4:00 Why is it 6-fluoro-3-heptyne? Why not 2-fluoro-4-heptyne?
need to get triple bond occurring soonest
You don't know how much you save me for this semester! thanks professor dave! 😭😭❤
this guy gonna help me fall of 2022, for now imma get as much info in so ill be prepared for next year
Now this has two longest carbon chains so why isn't this 5-chloro-4-methyl-3-hepten-3-ethanol?(Or 5-chloro-3-ethaanol-4-methyl-3heptene)?
Professor thank u so much..lots of love from india🤗🤗🤗🤗🇮🇳🇮🇳🇮🇳🇮🇳🇮🇳
Thanks to you prof I am not gonna fail at chemistry final exam tmw
u just saved my life =-)
can we name the last example as:
5-chloro-3-ethyl-4-methylhept-3-ene-1-ol
instead of 3-hepten-1-ol
Professor Dave thank you for this explanation its way better than my teacher
Greatly Explained !!!👍👍👍👌 Thanks a lot from INDIA.
You are a legend, glad I found you!
you can tell he loves teaching this stuff
just remember guys that the priority order for lowest occurance and in the selection of the principal carbon chain is Functional group (like OH, COOH, etc...) > unsaturated bond (double and triple bond)> Longest carbon chain (number of carbon atoms) > substituent groups (like F, Cl, Br, I, methyl, ethyl, etc...)
Thank you so much! Love the presentation. Clear, straight to the point and demonstrating "how" to approach the concept.
Thanks dude for making such awesome videos which help many people out there including me in my boards
Wow....you make it look so easy! Great stuff!
@6:15 Why don't we use the "ene" at the End instead of alcohol ? If the Alcohol Group Takes Priority then shouldn't it be First?
i.e, 5-chloro-3-ethyl-4-methyl-3-heptanol-3-ene
+Abdullah Rai hydroxyls take priority over alkenes and alkynes both in terms of numbering the carbon chain and naming the molecule, so the ol has to go at the end rather than the ene. priority will mean that it is the last thing that is named, implying that it is the functional group that most strongly contributes to the nature and reactivity of the molecule.
+Professor Dave Explains Thanks For Clearing That Up Professor =)
ohh, but can we name the alcohol group as hydroxyl group? it will become 5-chloro-3-ethyl-1-hydroxyl-4-methyl-3-heptene ?
nope, the hydroxyl is the most relevant functional group on the molecule so it will modify the suffix! we need the "ol" at the end.
ohh I see. okay, thanks for the explaination :)
Professor Dave Explains
Other sources are saying that alkenes and alkynes have the same priority but priority is given to alkenes for alphabetization in the event of a tie. I may have misread them.
Chemistry Dave grohl just saved me
I have a question: If that was an alkyne instead of an alkene at the end, would the suffix be "butyn-1-ol"? instead of "butyne-1-ol"?
sir, you are great... 👌👌
4:46 If you took the two Carbon atoms below the Hydroxyl group for the main chain, the main chain would also be made up of 7 carbon atoms. Why is one taken over the other as a main chain? 🤔
Hydroxyl groups are the biggest naming priority in this molecule, so the hydroxyl group needs to be on the main chain!
Dave! You've just inspired me to create a Chemistry/Physics RUclips Series. This is just a thought though. :)
What if there is more than one carbon chain with the maximum length ? In the last example there are 2 of length 7 that would lead to different names.
Id
YOU ARE AWESOME! Thank you so much for making these videos. You have no idea how much it has helped me..
You're such a great help!!!!!!!!!!! Thank you 😊😊😊😊😊
4:28 why the upper one?
Why not the one under it?
I would have a question :
in the example at 4:10 what makes us choose the top path? Is there a rule about chosing a path that minimize the number of bonds in the substituants?
With the same example taking the lower path would mean that the group would be 3 bonds long while taking the top one makes a 2 bond group. Am I extrapolating this correctly?
Or maybe there is a rule that state that family modifiers must be attached to the main chain, forcing to choose the path with the hydroxyl group.
In case the bottom path is valid what would be the name of this thing?
The parent chain must contain the hydroxyl group, it's the highest priority group.
@@ProfessorDaveExplains Thank you for clearing this up for me, and thank you for these incredibly well made videos.
Prof Dave can u make a clip on backbonding.....
Sir is it still necessary that you will put 1 before pentene?
Quick question. In the Alkene example you labled the substituent double bond 1-1-pentene. How come on this one it is not 3-3-3-heptyne, and it's just 3-heptyne?
that's an L for the end of methyl! it's just 1-pentene. we need just one number to indicate the location of the pi bond(s).
Awesome! Ok thank you. I was confused for a second. Can I just say I am loving your Ochem videos. I haven't taken this course yet but am prepping for my MCAT so in addition to my Kaplan test prep materials I am using this as a supplement. It is way easier to understand from you, and honestly it seems like Ochem is going to be fun. Never thought I would ever say that lol.
Nice intro song 😀
You're a truly life saver.
I have to tell u're so cool u hv many varieties of
streams, u're awesome. Now I can finally satisfy my curiosity for Science 🎉❤😊tnx a lot 😁
What if there are multiple tied longest carbon chains like at 4:28?
I love you so much, Professor Dave ❤️❤️❤️
in your last example, do you need the Z?
yep good call! i get to E/Z a little later in the series.
Yes 3 Zusammen. There is also chirality on the 5 carbon, so 5S3Z
I totally hate chemistry and I'm enjoying this ... Also, I have an exam in a few and I'm sure I got this covered thanks to your videos ☺️
If I only knew this video exists, I wouldn't have headache back then :D
You are a amazing teacher for children. You have pretty much explained everything. Your videos have benefited me and my friends greatly and i would love to have more of your videos. Please tell me about plus two chapter 9 coordination compound. Plzz arrgenttly my board exam in 2020 march .
Hi Prof. Dave. I wanted to ask, can we start by numbering the chain from the carbon that's below the alcohol (The one you called 3-ethyl), instead of the one that's right next to it?
nope! longest carbon chain must contain the hydroxyl group.
Glad someone already asked this question. So in that case location of the hydroxyl constinutent indicates the main carbon chain? Sweet
hey man thanks for asking it
Thank you again profs , have to submit answers to 100+ questions on IUPAC naming tommorow =w=
the -ane -ene -yne suffixes in phonetical languages are somewhat mixed up. Alkan Alken Alkin (respec.) is what it would sound like in slavic forms and would not directly correspond to EN pronunciation.
also, different languages (non-roman) would have the alphabetical order slightly altered , so I guess IUPAC also corresponds to language conversion or needs to be adjusted to its EN form
Thankx aloot Professor for your video .
it's really amazing ..
Why did you use the dash and hash (whatever it is) in place of actual methyl line representing the Methyls in the first formula of Alkenes?
check out the first tutorial in this organic chemistry playlist, it explains the dash and wedge notation
Me gets in front of the class: "its 5-chloro-3-ethyllll*mumblemumblemumble*-ol
Teacher: ........
me: ....imma head out...
Prof Dave, @6:22, because of the double bond, would we be expected to write this as
cis-5-chloro-3-ethyl-4-methyl-hepten-1-ol? or is there a reason we don't need to identify the cis/trans conformation?
so this would require E/Z nomenclature, i just haven't covered yet at this point in the series, there's another tutorial on that
I don't understand why you identify the longest carbon chain starting with the end that had the hydroxyl group and not with the one that ends in a carbon. Both would have given you a 7 carbon molecule. Can you elaborate please?
have to number so as to give hydroxyl occurring soonest, it takes priority
professor Dave what if there an alkene and an alkyne together in the compound what do we do ??????
thanks professor dave :3 my gf never listens to me but she WILL listen to YOU
I had a problem on a test that I didn't understand when naming. The compound is 4-chloro-1-methyl-2-propylcyclohexane. Why does the count in counting the carbon chain starts with the methyl and not the chlorine? I thought since Chlorine not being a carbon chain would take priority in naming, then I would counts backwards making the propyl third and the methyl fourth. Could you explain why the priority. Thanks. Love watching your videos.
so for cyclic compounds its totally different, check out my tutorial on IUPAC for cyclic compounds!
Can't E and Z be used to name the last compound...?
here 4:45 what priority takes alkanes? You didnt write that
alkyl and halogen are last
Thank you It helps me a lot
Sir What we will say if OH or CHO or COOH.PLZ ANSWER
If it is present
COOH gets highest priority. Then CHO, and in the end OH. numbering will be done in such a way that COOH gets lowest possible no. for example 3-hydroxy, 5-oxo- pentanoic acid
Regarding to that 1 on pente-1-nol in your next video of cyclic compounds you said it is implied that the hydroxyl group is on carbon1 thereby not writing the 1 on the final answer but here you wrote it there may i get to understand why?is it because that one was a cyclic and this one isn't....am confused now about numbering compounds with functional groups 😭
Hey Professor Dave, can you make a video on IUPAC of ethers?
Your videos are extremely helpful. Thank you so much!!!
what if a compund contains both double bond and triple bond?
You are best prof please sir I wish to ask if it's hept-3-yne or 3-heptene I love you sir God bless you
I also wanted to ask-- why are we not including Z/E stereoisomerism in this IUPAC name?
I watched other tutorial that write it this way "hept-3-en" is it correct? thanks!
yep, that is an equally correct way to do it.
Hept- or hepta?
very clear explanations thank you
Exam tomorrow thank you
@ProfessorDaveExplains, at 2:00 in the video, can't we name it as 4,4 - dimethyl - pent - 1 - ene instead ? BTW Great Help!!!!
yes that's synonymous! just a matter of taste.
Oh, Thanks!! I got it; A great THANKS from a 12th student from India.
keeping em coming lol great video professor dave
in the last example Why didn’t we identify the main and longest chain in a way
which it would be horizontal because it is the same length (made up of 7 carbon
atoms) ?
we need that hydroxyl in there!
the hydroxyl group is going to be a substituent at both ways
we need it on the main chain to use the suffix properly
best professor
Which has more priority in halogens and alkyl ?
equal priority
@@ProfessorDaveExplains sir if we take an compound having both substituents of halogens and alkyl . From which direction we will give numbering ?
whichever direction gives a substituent soonest
Thanks Mr
We need another hair style 😂🇲🇼
Superb.. Its helpful
Can I write 4,4-dimehtyl pent-1-ene, or does it have to be 4,4-dimehtyl-1-pentene? I also did 6-iodo hexan-3-ol instead of 6-iodo-3-hexanol. Is that correct? Please only comment if you are an expert in this. Thanks!
interchangeable
May you will be bless always thanks for releasing my stress
Why hydroxyl given highest priority?
😊logic behind please!
5:51
ladies and gentlemen, i think my brain just committed suicide.
😂😂😂
Can I say propan-2-ol, or prop-2-ene instead of 2-propanol or 2-propene? Thanks
yes you can
@@ProfessorDaveExplains thank you very much. You are a great teacher 😊
Thank you very much Sir 😊
Hello sir! Love your teachings always, it is much easier and clearer than my profs at school who makes it more difficult to understand. Anyways i do have one question to clarify. Aren''t alcohols termed as OH? 😶
an OH is a hydroxyl group, and a molecule with a hydroxyl group is called an alcohol
@@ProfessorDaveExplains okk, thank you sir for the reply😊