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

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!

@lanchon5077

5 жыл бұрын

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.

@fsben700

3 жыл бұрын

look at the mess were in now

I understood this faster than the hour lecture I had. this guy is amazing!

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 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

This is great. I finally understand. I used to get these kind of problems wrong and I couldn't understand why.

Someone give this man a medal.

I honestly don't know why teachers can't be as good as you.

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!!! :-)

Thank you. I for some reason could not understand how to come up with the common names. This is the best video explaining it.

east or west sal is the best

you are my new teacher ! thanks !!!!!!

I am in 6th grade but I still understand the organic chemistry playlist! Thanks so much Mr.Khan!

your videos beat crashcourse by ten-fold. and you teach better than my chemistry teacher!! keep up the good work!!

At about 7:00 the sec and tert are for secondary and tertiary respectively. Would that help to remember?

@mondepriscillasuya4280

2 жыл бұрын

Yes 👍😊 I will actually never forget so helpful thank you

@shook9702

2 жыл бұрын

THANKYOU

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.

Sal your videos are my secret weapon to understanding my science courses!!! MUCH THANKS!!!!

You are awesome Khan Sir!!!!

thanks for this needed a bit of review

YOU ARE AWESOME. YOU ARE INCREDIBLE! THANK YOU

The best tutor I have ever met.... Thank you sir

lteral tenia cinco menos de 5 minutos para entender los prefijos estos y los acabod de entender completamente gracias a tu video,muchas gracias

Thank you very much! You rock!

Cool way of lecture!

Common Nomenclature - Meth, Propyl, Butyl, Isobutyl Systematic Nomenclature- Ethyl, Isopropyl, Butyl, Sec-butyl, Tert-butyl

very useful video, thanks!

this was awesome!!

You are brilliant!! Thank you so much!!

Very well explained. Thanks.

I don't know how I can thank U for this vedio !

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 ;)

Thank you so much -Come from Thailand-

This helped a ton!!!

Very well explained! 🎉

Wonderful teacher!

tert.. tert,,,, tert, :) brilliant as always

thanks alot!! :D

wow I must tell u that your voice make me learn! you are so charismatic! so thanx! you are my best youtube teacher

@dhruvpawar3733

4 жыл бұрын

dont hit on him

I love you, you are my saviour. I have an exam tomorrow (crying from inside)

god bless you this was very helpful thanks you

You save lives....

Very Helpful

you explain it better than my professor!

O. Chem quiz tomorrow morning, thank you!!!

omG THANK YOU THANK YOU

you wrote "isoBUTLYcyclopentane" there :))) this is a great project, thank you.

@amosw766

2 жыл бұрын

And later "methly-propyl"

Thank you sir

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.

@yatharthbakshi

6 жыл бұрын

Nkb1991 me too

@blackorbman

6 жыл бұрын

Nkb1991 as a chemist you would get tired reeeally fast doing that

@MoreParksLessParking

4 жыл бұрын

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.

thanks for the easy to understand explanation.

You, my friend are a God! Thank you for helping us mortals understanding the ways of chemistry...

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???

12:53, is it possible to have the 1,1*dimethyl ethyl group be a U-shaped 1,2*dimethyl ethyl or would it only be correct when called 1-methyl propyl?

Why wouldn't we draw the longest line connecting 3 carbons in the tert-butyl?

doesnt S refer to the the counterclockwise if you add priority?

you are amazing

you are the best organic teacher i've come across.w

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*

@dobbysurfs

3 жыл бұрын

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?

Is it necessery using brackates ??

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?

Would it be right to say 1-dimethyl-ethyl cyclopentane?

Thanks a lot :>

his videos never age

Thank u, thank u, thank you I am fine now..

you are great

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

@zombiesalad2722

8 жыл бұрын

he said in later videos that iso is more common

what is the program he is drawing on ?

Can we have cyclobutyl cyclopentane?

I almost died laughing at the (1,1 di-methyl-ethyl)-cyclo-pentane :)

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

Is there chance to write sec - butyl as iso - butyl??

Why weren't teachers in high school this elaborate?

What software does sal use ??

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!

how can i dwld this video with subtitle... pls help me..

this guy fucking rocks!!!!!!!! thank you =') im gonna shed a tear

at 4:40 should it not be tert butyl cause it is actually connecteed to three carbons ?

Systematic makes way more sense.

would these names be considered isomers of butyl clyclopentane?

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.

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

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.

my school need to hire you

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 :)

@mahmoudal-maghraby3036

2 жыл бұрын

If it’s more than 4 carbon group, it would change the backbone of the structure.

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...

Hello, Khan. i really wanna meet you in person. it would be an honor.

Please help me, why is isopropyl alcohol an iso, when it should be sec, if following your lecture? I'm really confused.

@achyuth372

7 жыл бұрын

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

thx thx

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?

7:09 would it be correct to call it N-butyl?

@koustube4167

8 жыл бұрын

yes you can

@koustube4167

8 жыл бұрын

n means normal.

@anonymous-pb2fc

8 жыл бұрын

+Koustubh Heblikar Normal or neo

@Zzznmop

8 жыл бұрын

Thank you

@laithharb4259

8 жыл бұрын

+zach p no not neo. it stands for normal

why we dont call isopropyl alcohol as sec butyl alcohol

why not attach the bond entirely? 10:48

12:23 cant we name it( 2-methyl propyl ) cyclopentane☺

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 :)

not really a fan of line diag. but explanation goes awsm!

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

Thank youuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

Best

shouldn't it be n-butlylcyclopentane instead of s-butlylcyclopentane , the first one which u explained in common name.

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?