I just watched 8 videos in a row and I learned SO much information! I never knew this stuff before. Very interesting

Thank you for doing organic chemistry!!

Would the systematic name for the second molecule be 5-heptyl-1-(1,1-dimethylethyl)-2-propylcyclononane?

@pewnit

7 жыл бұрын

Yep.

@ThreeNamesGrace

7 жыл бұрын

I think it should be 1-heptyl-5-(1,1-dimethylethyl)-4-propylcyclononane; because, in this case, we would be considering the heptyl group as the start, this because of alphabetical order (heptyl, dimethylethyl, propyl).

@leahgreene5880

6 жыл бұрын

Axel Bryan Joel Yañez Meraz Incorrect; it should be numbered to have the lowest possible numbers and should be 5-heptyl-2-propyl-1-(1,1-dimethylethyl)cyclononane.

thank u very much sir, these videos are quite useful , rethanks

thank you very much this help me a lot with my course work :D

Easy peasy :) Love your videos!

thank you very much I am grateful for this video

Yes, please rock on.

I could be wrong about this but I believe the general rule for placing in alphabetical order is that if the prefix is used for some sort of naming (sec, tert, etc. or di, tri, etc.) then it is not considered in the ranking. However, if the prefix describes a characteristic ( like -iso) then it is included in the ranking. For the second example, isobutyl and tertbutyl would both work and thus means there are 2 correct names for the entire molecule.

To start organic chemistry with naming and explain the background is another brilliant idea. Keep on going.

A QUESTION: for the first example, i remember from an earlier video of urs that we start numbering the attached compound (in this case the butyl group) from where its attached to the the parent chain.. why did u start from the other end?????? PLS REPLY, thank you

@sebastianvettel7363

4 жыл бұрын

Since there are two chains of 13 carbons, we pick the chain which has a larger number of branches. If we start from the absolute right, then there is one branch only. However, if we start the way Sal started in this video, we would be getting two branches (methyl and propyl). That looks like a s-butyl group but it is simply a methyl group from the 3rd carbon.

For the first one i counted from the very right i got 13 as the longest chain and my common name was 4-s butyl tridecane. Is that right or am i missing something?

@arcisle5162

6 жыл бұрын

thats what i got too

@philipranjit4586

5 жыл бұрын

i know this is a year old but i got the same answer first time around. but im kinda sure thats wrong because i think for numbering you have to take the chain with more branches. So if you count from the very right you only have one sec butyl branch. But if you take the other long chain you'll have one methyl branch and one propyl branch. this is what i remember from school just putting it out there if anyone has the same doubt.

@sebastianvettel7363

4 жыл бұрын

@@philipranjit4586 Yeah it is correct. He even told it in the video.

@junior1984able from what Hal said in a previous video, we just assume there is a hydrogen attached unless specified otherwise

@RoyceRK At the central Carbon of the Butyl group , Iso- has 2 chains attached to the central Carbon (+1 chain to the main branch), whereas Tert- has 3 chains attached to the central Carbon, +1 chain connecting the Butyl group with the main branch. Hope that helps

Could it be also 3-methyl-4-isopropyltridecane ???

So I am confusion: when do we use alphabetical order and when Chan Ingold Prelog rules?

i think it's 1-(1,1-dimethylethyl)-5-hepthyl-2-propylcyclononane. It's because on 1st C atom you have 1,1 dimethylethyl group, so that's 1-(1,1-dimethylethyl). Next, you have hepthyl group on 5th C atom and propyl group on 2-nd C atom, but 5-hepthyl goes before 2-propyl because of alphabethical order - H stands before P.

@OMG-qr3kv

3 ай бұрын

Doesn’t “h” come before “m”? So it would be: 5-heptyl-1-(1,1-dimethylethyl)-2-propylcyclononane. You ignore the “d” in dimethylethyl to determine the order no?

Hey we can also write the first compound's name as 4-butyl tridecane. Can't we?

For the first one, instead of the methyl and prophyl, if you named it the other way would you still get the same result?

for the first molecule would 4-sec butyltridecane work also?

Sal, alphabetical rules are only a secondary consideration to assigning the lowest possible numbering sequence. In the last molecule you drew, if you switched the positions of tert-butyl and heptyl, heptyl would now be designated as "1" even though butyl comes first alphabetically. Lowest possible numbering >> alphabetical priority.

@OMG-qr3kv

3 ай бұрын

I thought I remember something about this! I was sure that lowest possible numbering takes priority so we wouldn’t number based on alphabetical order but instead by assigning lowest possible number to the branches. Otherwise the numbering would change if you used common vs standard naming for that second compound right?

So the systematic name of the second compound would be 1- bis(1,1-dimethylethyl)-5-heptyl-2-propylcyclooctane. Right?

Hey.. Question?? Don't you have 2 propyl groups on C4 ? making it 3-methyl-4dipropytridecane? if not.. then y?

Quick question if anyone knows the answer. On the first one, could it be 3-methyl-4-n-propyl? Isn't that the common name and hes just using the systematic for the propyl group....or am I way off?

@user-ns5kr5fe2e

5 жыл бұрын

the first example must be named "4(1-methylpropyl)tridecane" or "4-s-butiltridecane" because main chain have one group on 4 th C. third C do not have any groups

why isn't the tert butyl also considered iso-butyl?

instead of tert butyl why cant we say isobutyl in this case ?

Why is tertbutyl considered alphabetically first but say if it were a isobutyl it wouldnt? I swear in other videos the 'i' in iso is considered in the alphabetical order over the hydrocarbon name where as it's not for tert?. Am I missing something?

As for my question, for the second molecule, are both the following names correct? 1-tert-butyl-5-heptyl-2-propyl cyclononane OR 1-heptyl-5-(1,1-dimethylethyl)-4-propyl cyclononane

If the chain is bigger than the ring which should take as a backbone

Is there no systematic naming for the 1-t-butyl-5-heptyl-2-propyl-cyclononane structure?

I think it's: 1-ethyl-(1,1 dimethyl)-2-propyl-5-heptyl cyclononane

Yes, iso-butyl is -CH2-CH-(CH3)2 tert-butyl is -C-(CH3)3

i'm taking organic chemistry now and my professor told us that we name the parent chain first, then we start to name the substituents. And he mentioned that we start to number carbons on the main chain starting from the largest charm, in this case will be heptyl - for the second compound. I'm confused since your word and his word are different, which one is true? do we go by alphabetical order no matter the size or the charm or do we have to consider them in naming?

in the 2nd problem when we consider to use common name for tert butyl then we have to consider it as one and then take (T) as the 1st letter so the final solution is 1-heptyl-7-propyl-6-tert-butyl-cyclononane. I say this because in the next video you have taken iso-butyl as one word and taken I as the 1st letter.

can tertbutyl be called isobutyl?

6:20 the previous video you said you number the ring in a direction such that you start with the first branch group and the next group you encounter has the lowest possible number. Why is it alphabetical now?

@ciao_abhi

7 жыл бұрын

never mind. I should have kept watching the video after 6:25

my question, is every time theres a point in the structure, its a carbon atom?? so how do you know if theres a hydrogen there???

To me tert-butyl looks like isobutyl. Also, on a test, if I forgot what tert-butyl looked like, could I name it something like (1,1-dimethylethyl)

@RuanWun

8 жыл бұрын

+aiden Moore Yes you can.

@saminatariq561

8 жыл бұрын

no tert butyle doesn't look like iso butyl but neo butyl

How did you get trisecane from?

@dongwenkai1399

7 жыл бұрын

watch video 2-"Naming Simple Alkanes"

@dongwenkai1399

7 жыл бұрын

P.S>did you mean tridecane?

Could the second one be: 1-heptyl-5,5-dimethyethyl-4-propylcyclononane ?

I love you.

the first example must be named "4(1-methylpropyl)tridecane" or "4-s-butiltridecane" because main chain have one group on 4 th C. third C do not have any groups в первом примере если назвать "3-метил-4-пропилтридекан", то это будет другая молекула, у которой к третьему атому главной цепи присоединен метил, а к четвертому пропил. На самом деле втор-бутильная группа целиком стоит на 4-м атоме, как ни крути. но все равно спасибо! может быть такие ошибки даже нужны ;) для проверки

could you pls tell the systematic naming of the second compound????

@pewnit

7 жыл бұрын

1-heptyl-5-(1,1-dimethyl ethyl)-4-propyl cyclononane

@karam1184

7 жыл бұрын

I think you are correct, and it would suffice, however I think your numbering should start 1 at the dimethyl ethyl group. So it should be, 5-heptyl-1-(1,1-dimethyl ethyl)-2 propyl cyclononane.

@pewnit

7 жыл бұрын

Karen M But di doesn't count in alphabetical naming, right?

@ThreeNamesGrace

7 жыл бұрын

Punit Daga Yes, it doesn't.

@leahgreene5880

6 жыл бұрын

Correct, but you should have the lowest possible numbers for the substitutes. So it should be 1,2,5 instead of 1,4,5.

#8

I believe iso is for 2 branches only.... Somebody correct me if I'm wrong

Why is cyclononane at the end? the n from nonane comes before the p in propyl??

@killbot0011101000101

7 жыл бұрын

Cyclononane is the backbone, so it goes at the end.

@frostboomba1462

7 жыл бұрын

lol

@s05bf1c5 because there are 3 carbons attached to the same carbon. Isobutyl would mean the main chain, attached to a carbon which is attached to another carbon which is attached to 2 carbons as in: -C-C-C2. Remember, the iso's are the 'Y' type things. Hope I didn't confuse you further. Watch the example 2 video.

😊🎉

In organic it is assumed that the Carbons are saturated with hydrogen. I.e They contain all the hydrogen's that are possible to attach.

last video .. u said that ( iso propyl comes before methyl ) cuz i of iso comes first beforem of methyl ... and now u put tert butyl before heptyl ... :) explain please if u dont mind ...

@MegaTheDing

8 жыл бұрын

+MMM yassin He actually explained it in the video - in isopropyl the "i" would be considered for the alphabetical rule whereas for tert-butyl, its the "b" that is considered. He simply explained it as "if the name has a hyphen, don't consider what comes before the hyphen" :)

gene

systematic naming--> 1-heptyl 4-propyl 5-(1,1 dimethylethyl) cyclononane Am I right?

113-0

Because the ring doesn't count as part of the chain.

why is the first one tri?

@0xVikas

8 жыл бұрын

Cus is thirteen, everything after 10 has root word of the previous numbers ( 1-9 ) and has a deca at end like for 12 it's dodeca

@yajingran7460

8 жыл бұрын

ahahahthank you.

.

Is the correct systematic naming: 5-heptyl-1,1-bis(1-methylethyl)-2-pentylcyclononane?

@pewnit

7 жыл бұрын

Not bis... its *1-heptyl-5-(1,1-dimethyl ethyl)-4-propyl cyclononane.*

its not hard but its freaking tedious

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