Dude. You should really know just how helpful you really are. You're literally saving thousand of students around the world including me. Huge respect man.
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
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.
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
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...)
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 .
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? 🤔
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
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.
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?
Ur osm in ur ownkind in doin orgo simpler than our professors who made it complex Plz cover the topics like preparation of hydrocarbons I wish u would do it bruhh...◉‿◉
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? 😶
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 😭
@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.
My therapist: Jteacher (Jt music pun) isn't real, he can't hurt you Jteacher: Yow, man, that wasa joke. thanks for you vids, it helps me thru my chem class.
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.
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?
