nmr spec - chemical environments? (2 Viewers)

[nsw..wollongong]

im so confused on H and carbon environments, it just doesn't make sense to me. someone told me that i should attach letters to the different environments but I'm so lost, can anyone help explaining? thank youuu

 

[synthesisFR]

Basically environments r like specifically areas which are chemically equivalent
Meaning that they have the same neighbouring molecules around them
It’s hard to like teach u the whole thing in text bc there’s so many parts to it but possibly give a few compounds that I could explain with?

 

[nsw..wollongong]

Basically environments r like specifically areas which are chemically equivalent
Meaning that they have the same neighbouring molecules around them
It’s hard to like teach u the whole thing in text bc there’s so many parts to it but possibly give a few compounds that I could explain with?

yeah like i understand what it is i just have trouble putting it into practice. take propanol for eg, how do u deduce the different environments?

 

[nsw..wollongong]

idek, i dont understand this at all

 

[synthesisFR]

Ok so basically

 

[synthesisFR]

View attachment 39535 idek, i dont understand this at all

Carbon
There’s two carbons they aren’t equivalent tho
Look what they are bonded to
Clearly different atoms right so different environment
Think of it like electronegativity
for hydrogen the methyl group on the left has all three equivalent bc they are all bonded to the same Carbon bonded to the same rest of the molecule
Same for the two b
And the c is a separate bc it’s next to a oxygen
It’s hard to explain but like

 

[nsw..wollongong]

Carbon
There’s two carbons they aren’t equivalent tho
Look what they are bonded to
Clearly different atoms right so different environment
Think of it like electronegativity
for hydrogen the methyl group on the left has all three equivalent bc they are all bonded to the same Carbon bonded to the same rest of the molecule
Same for the two b
And the c is a separate bc it’s next to a oxygen
It’s hard to explain but like

wait what... so how many carbon and H environments are there actually? like take, idk 2,3-dimethylpentane
how do u even figure it out??

 

[synthesisFR]

wait what... so how many carbon and H environments are there actually? like take, idk 2,3-dimethylpentane
how do u even figure it out??

One min lemme sketch it on my phone cuz I’m in bed rn

 

[nsw..wollongong]

One min lemme sketch it on my phone cuz I’m in bed rn

oh no no its okay, don't worry abt it u should go to sleep. ill try to watch a lecture or sum thank u tho

 

[synthesisFR]

oh no no its okay, don't worry abt it u should go to sleep. ill try to watch a lecture or sum thank u tho

Yep okay
I can send a few vids on h and c nmr tmrw morning it’s good

 

[nsw..wollongong]

does this look right?? dw abt the messy diagrams i just dk if i have the environments right

 

[synthesisFR]

View attachment 39537
does this look right?? dw abt the messy diagrams i just dk if i have the environments right

Uh it’s kinda drawn wrong

 

[nsw..wollongong]

Uh it’s kinda drawn wrong

fml what did i do, I'm blaming it on the fact that its almost midnight and I'm tired

 

[synthesisFR]

fml what did i do, I'm blaming it on the fact that its almost midnight and I'm tired

2,4 dimerhyl pentane

 

[nsw..wollongong]

2,4 dimerhyl pentane

wait oml the question itself was 2,4-dimethyl
so i drew it right but wrote down the question wrong

 

[synthesisFR]

Oh then it’s fine

 

[SadCeliac]

@nsw..wollongong i can try explain when I get some time at school today <3

 

[carrotsss]

View attachment 39537
does this look right?? dw abt the messy diagrams i just dk if i have the environments right

yes that’s it, you just have to count the number of situations carbon/hydrogen atoms are in and which ones have the same things around them

 

[SadCeliac]

im so confused on H and carbon environments, it just doesn't make sense to me. someone told me that i should attach letters to the different environments but I'm so lost, can anyone help explaining? thank youuu

@nsw..wollongong i can try explain when I get some time at school today <3

As soon as a hydrocarbon is non symmetrical it's gonna have a unique environment for each Carbon. For example, an alkane is symmetrical and has two environments. But something like an alkene has multiple unique environments.

For H NMR:
you are told how many hydrogens are in the neighbouring environments, as well as how many hydrogen environments

uh yeah i think synthesis helped before soo

 

[nsw..wollongong]

i just woke up from a dream of my father marrying nicki minaj in a german stadium

As soon as a hydrocarbon is non symmetrical it's gonna have a unique environment for each Carbon. For example, an alkane is symmetrical and has two environments. But something like an alkene has multiple unique environments.

For H NMR:
you are told how many hydrogens are in the neighbouring environments, as well as how many hydrogen environments

uh yeah i think synthesis helped before soo

okay okay wait i think i get it but I'm just overcomplicating it, smh u wouldn't even get a question on this would u???