Common and systematic naming: iso-, sec-, and tert- prefixes | Organic chemistry | Khan Academy
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- Опубликовано: 27 авг 2024
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Common and systematic naming - Iso, Sec and Tert prefixes. Created by Sal Khan.
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I just want to let you know that my OChem professor links your videos on his syllabus as "optional but recommended"....and it should be listed as MANDATORY. I just have to say...thank you...alot
This is why I dont like one on one tutors when the internet has so much potential to give us everything we need. People need to stop going on the internet just for facebook and social media or checking emails. It can give you everything YOU NEED. Khanacademy is by far the best instructional videos I have ever seen,
I understood this faster than the hour lecture I had. this guy is amazing!
Sal, You know entirely too much about Everything!lol you got my vote for president sir..we need someone like you that knows how to think, to get us out of this mess!
I know this is super late but sal has been helping me from grade 10 algebra, through my SAT exams, and now through organic chemistry in my first year as a dental student. He deserves the best.
look at the mess were in now
I am studying first year science(including) right now. Thanks a lot sir . I never understood chemistry in my class . And organic was just out of my head
better than my professor
Someone give this man a medal.
you gotta be the coolest teacher, your voice projection your clearness and how you catch your own minimal errors its just so easy to learn from you!! I highly appreciate you and your courses (I've been following you ever since bio and physio!!! :-)
I honestly don't know why teachers can't be as good as you.
This is great. I finally understand. I used to get these kind of problems wrong and I couldn't understand why.
Thank you. I for some reason could not understand how to come up with the common names. This is the best video explaining it.
you are my new teacher ! thanks !!!!!!
east or west sal is the best
At about 7:00 the sec and tert are for secondary and tertiary respectively. Would that help to remember?
Yes 👍😊 I will actually never forget
so helpful
thank you
THANKYOU
your videos beat crashcourse by ten-fold. and you teach better than my chemistry teacher!! keep up the good work!!
Sorry for my english. I'm brazilian, but I will try to explain.
The Iso has the same extreme in both sides(CH3, in this case).
The sec happens when the first carbon from the alkyl group bonds with 2 other carbons. That's what I understand. Thanks to Steve for also think a good idea to contribute with education.
wow I must tell u that your voice make me learn! you are so charismatic!
so thanx! you are my best youtube teacher
dont hit on him
I am in 6th grade but I still understand the organic chemistry playlist! Thanks so much Mr.Khan!
thanks for this needed a bit of review
You are awesome Khan Sir!!!!
Common Nomenclature - Meth, Propyl, Butyl, Isobutyl
Systematic Nomenclature- Ethyl, Isopropyl, Butyl, Sec-butyl, Tert-butyl
I love crash course but it's helpful with the basics only (no org chem unfortunately :( ), I mean, only Hank would go and open the lab shower for us to see ;)
Cool way of lecture!
Sal your videos are my secret weapon to understanding my science courses!!! MUCH THANKS!!!!
lteral tenia cinco menos de 5 minutos para entender los prefijos estos y los acabod de entender completamente gracias a tu video,muchas gracias
YOU ARE AWESOME. YOU ARE INCREDIBLE! THANK YOU
you wrote "isoBUTLYcyclopentane" there :)))
this is a great project, thank you.
And later "methly-propyl"
The best tutor I have ever met....
Thank you sir
You are brilliant!! Thank you so much!!
I'm not a huge fan of those line diagrams, I prefer writing the carbons out- don't know why but it makes more sense to me that way.
Nkb1991 me too
Nkb1991 as a chemist you would get tired reeeally fast doing that
For me it's a higher priority to write the hydrogens out, as they preserve the structural representation of the molecule more accurately if you leave them in. Full blown line diagrams should only be when you want to emphasize the chemically "interesting" parts of a molecule, but for actually visualizing the structure of a molecule they can confuse and mislead you. I often have a habit of forgetting that the hydrogens are still there in addition to all the shown functional groups, when trying to visualize a molecule from just its line diagram.
You save lives....
very useful video, thanks!
Thank you very much! You rock!
tert.. tert,,,, tert,
:) brilliant as always
god bless you this was very helpful thanks you
9:10
IUPAC UPDATE :
The substituent is connected to the ring at C2 ( the second carbon )
so it will now be renamed as ( AS PER NEW IUPAC RULES )
*but-2-yl*
Thank you I was wondering why sal wrote that and thought I was somwhere wrong and tert butyl cyclopentane 's sytematic name is (2-methylpropyl) cyclopentane right?
I love you, you are my saviour. I have an exam tomorrow (crying from inside)
this was awesome!!
Why wouldn't we draw the longest line connecting 3 carbons in the tert-butyl?
Why weren't teachers in high school this elaborate?
I don't know how I can thank U for this vedio !
Very well explained! 🎉
thanks alot!! :D
it is very good but still did not get the difference between ISO and Sec !!!? i looked up for other structures like isobutyl and could not indicate its name
he said in later videos that iso is more common
thanks for the easy to understand explanation.
You, my friend are a God! Thank you for helping us mortals understanding the ways of chemistry...
This helped a ton!!!
you explain it better than my professor!
I'm having a problem because of the way I count every line ending as a carbon like what you had begun with so it makes me wonder when you draw the branch off group then attaches it to it wouldn't that make a different compound if I was to continue counting it from how we started off?
Very well explained. Thanks.
Thank you so much -Come from Thailand-
his videos never age
Is it necessery using brackates ??
you are the best organic teacher i've come across.w
omG THANK YOU THANK YOU
Just to clarify the difference between SEC and TERT
1.) SEC=when the first carbon has two branching carbons
2.) TERT=When the first carbon has 3 bracnhing carbons
7:09 would it be correct to call it N-butyl?
yes you can
n means normal.
+Koustubh Heblikar Normal or neo
Thank you
+zach p no not neo. it stands for normal
Wonderful teacher!
Thank u, thank u, thank you
I am fine now..
Is this common naming only specific to butyl groups or can it also be used for branches that contain more than 4 carbons? Seems like this example and in some other videos its always a butyl group making it seem like its either only specific to that type of group or maybe the branches don't get bigger than 4 carbons... please explain :)
If it’s more than 4 carbon group, it would change the backbone of the structure.
O. Chem quiz tomorrow morning, thank you!!!
this guy fucking rocks!!!!!!!! thank you =')
im gonna shed a tear
All I wanna know is Whom on God's free green earth, came up with this and what were they thinking. They should have kept it to themselves cause it's messing with my brain lol. Good video
Very Helpful
Please help me, why is isopropyl alcohol an iso, when it should be sec, if following your lecture? I'm really confused.
i guess its never too late to help well in the sec butyl the line ends with 2 branched carbons but is connected to second carbon of butyl chain in the iso butyl there are two branched lines but here the carbon is connected to first carbon of butyl group
my school need to hire you
The whole "sec", "tert" and "iso" prefixes as explained in the video for butyl groups, don't seem to have the same meaning on propyl groups, am I right? Very confusing. For example, isopropyl, it's not attached to the first carbon on the chain, or, it's not attached to 1 other carbon it's a secondary group. But with isobutyl, it is a primary structure or attached to one other carbon.
because instead of putting 1,1 if you are lazy since it´s a cyclocompounds it doesn´t matter where you put it so you could just name it dimethylethylcyclopentane I think that´s what he meant :)
Thank you sir
Systematic makes way more sense.
What is the difference between an iso butyl and an n-butyl? They are both connected to carbons that are linked to only one carbon
if i am understanding correctly, in your common butylcyclopentane that you drew, couldnt that also be called and Iso-butyl? Or in other words isnt the top left and bottom right BOTH isobutylcyclepentanes???
at 4:40 should it not be tert butyl cause it is actually connecteed to three carbons ?
Hello, Khan. i really wanna meet you in person. it would be an honor.
I almost died laughing at the (1,1 di-methyl-ethyl)-cyclo-pentane :)
Is there chance to write sec - butyl as iso - butyl??
doesnt S refer to the the counterclockwise if you add priority?
why not attach the bond entirely? 10:48
Why must you include the "1,1" on "dimethylethyl"? Surely it's not required because it cannot be on Carbon-2 since then it would be "2-methylpropyl" and would be "iso-" instead of the "tert-" structure? So, is it essential to include the "1,1" even though it's an obvious given?
Sorry for not understanding, but can you clarify by not using "1,1" prefix on (1,1-dimethylethyl)cyclopentane? I mean what systematic name do you suggest the T-Butylcyclopentane? I still have a hard time understanding IUPAC naming lol ... sigh...
Would it be right to say 1-dimethyl-ethyl cyclopentane?
Now that I have seen that video I am thinking that I am really stupid for not getting it before. The video was very helpful!
Thanks a lot :>
But according to iupac , if there are 3 or more carbons attached to a ring , then the ring is treated as subsituent instead of the chain .
In this case since the ring and the substituent both have 5 Cs, the ring is treated as the parent chain. If the substituent would have more C's than the ring we would have preferred the substituent as the main chain.
@@ritankarmondal0411 ok
So in my skool ....our teacher is teaching all this in class 10....I am in class 10....and ...lol I'm happy I can do it finally
you are great
Shouldn't it be: ethyl-1,1-methylpentane? because its supposed to be alphabetical?
+ozkan cil I'm confused about this as well. Google tells me Sal is right, but can someone explain why?
I feel like it should be (1,1-ethyldimethyl)cyclopentane
Yea today in class the teacher said its suppose to be alphabetical. Maybe depends on the teacher. Ask ur teacher.
+Adam Baum i think it should be (1,1 dimethyl ethyl)cyclopentane because the ethyl group is not acting as a prefix but it is the parent chain. it is the longest carbon chain.
so he named it correctly. Hope this helps.
+ozkan cil it is alphabetical if both of them are prefixes but ethyl is the longest chain and it is the parent chain
you are amazing
Can we have cyclobutyl cyclopentane?
I find the 1,1 unnecessary. I mean, isn't the di- part in dimethyl already written? Doesn't it already show that two methyl groups are attached to the ethyl group?
What software does sal use ??
I don't have to learn this...but i like watching it because for some reason i am interested in it and the commentary is soo good....and it is so understandable......thank you sir.
"systematic" would be using IUPAC nomenclature rules.
i understand why they use the common nomenclature now. the systematic one is so confusing
Amazing! But why propyl not propane?
ahmad hneine in this compound, the chain is an alkane functional group so propyl, not propane. therefore, it's not the base chain of the compound (cyclopentane) :)
Alright, thanks for explaining that really helped.
the common naming doesn't make sense here, or else it just didn't get defined properly.
This seems to confuse alot of people down the comment section.
The sec-butylcyclopentane and the iso-butylcyclopentane. Does not have as you say 2 and 3 connections. Did you swap them around by mistake? that would make sense. Since the one you call; S-butyl has the first carbon connected to 3 carbons and 1 Hydrogen. the Iso is only connected to 2 not 3 as you say. The tert is connected to 4 carbons -- as you say.
It only makes sense if i assume u swapped them by mistake. So the Isobutyl is really the secbutyl, the secbutyl is really the isobutyl and the tertbutyl is really the tertbutyl.
Correct me if im wrong.
+Jacob Dalby the secbutyl group has two carbons connecting directly to the carbon that's connected to the cyclopentane. The isobutyl group has only one carbon connecting directly to the carbon that's connected to the cyclopentane. That's the reasoning.
would these names be considered isomers of butyl clyclopentane?
why do u call it sec butlycyclopentane and why do u call it iso butyl. what do you mean by sec and iso?
why we dont call isopropyl alcohol as sec butyl alcohol
por que? que esta mal?