Finding the protons responsible for each peak in NMR spectra graphs Help!

[matty.k]

hey guys I'm just finishing off a few questions in chapter 7 that i haven't finished and I'm just finishing NMR
so far its been a piece of cake with finding the proton environment, finding the relative number of hydrogens in each environment , finding the value of the chemical shifts but when it comes down to finding the protons responsible for each peak set and the carbon to which they are bonded in i get really confused. I've practically given up, until of course school resumes and just went on with the last few chapters for unit 3 but thought i should ask you smart cookies at VN for some assistance. could someone explain or link me on how i could find the proton environments responsible for each peak and the carbon to which they bond to. this is question 40 iv in chapter 7 review. thanks in advanced

[vexx]

hello.

well you use the H NMR table to find out what the hydrogen is attached too as it tells you the chemical shift on the NMR graph. Each peak is split due the number of hydrogens on adjacent carbons, for example on that graph the peak 'X' is a single peak due to it being attached to atoms that do not have any hydrogens (uses the n+1, rule so zero adjacent hydrogens has one peak), and you can find out what it is attached to using the table to see what ppm of ~12 is.
same with Z, you can see it has 3 peaks, so it is attached to carbons that have 2 hydrogens in total, and Y has four peaks so attached to carbons that have 3 hydrogens in total. find what they are attached from the table using their ppm.
make sense?

[matty.k]

i think i got my head around it now, i was confusing myself with the structures on the table with the structures in the question if that makes sense, thanks for making it that much clearly for me, appreciate it mate

[matty.k]

Woo! thanks for that explanation, I'm finally done, didn't realize it was that easy. thanks for your help

[vexx]

Woo! thanks for that explanation, I'm finally done, didn't realize it was that easy. thanks for your help

no problem:)

[happyhappyland]

NMR isnt easy, its probably the hardest bit of unit 3 in my opinion, next to redox. Biochemistry is easy, the titration and gavemetric stuff was OK, chromotography is easy, its just spectroscopy and NMR the hardest... in terms of concept

[vexx]

NMR isnt easy, its probably the hardest bit of unit 3 in my opinion, next to redox. Biochemistry is easy, the titration and gavemetric stuff was OK, chromotography is easy, its just spectroscopy and NMR the hardest... in terms of concept

NMR isn't too bad, there isn't actually that much you need to know. the theory isn't that long & once you learn to be able to use the graphs - that's all there is too it.

[happyhappyland]

NMR isnt easy, its probably the hardest bit of unit 3 in my opinion, next to redox. Biochemistry is easy, the titration and gavemetric stuff was OK, chromotography is easy, its just spectroscopy and NMR the hardest... in terms of concept

NMR isn't too bad, there isn't actually that much you need to know. the theory isn't that long & once you learn to be able to use the graphs - that's all there is too it.

Its hard to find the structure in my opinion because the databook and the chemical shifts are not exact, they are approximate. I just find it hard to picture out the structure.

[vexx]

NMR isnt easy, its probably the hardest bit of unit 3 in my opinion, next to redox. Biochemistry is easy, the titration and gavemetric stuff was OK, chromotography is easy, its just spectroscopy and NMR the hardest... in terms of concept

NMR isn't too bad, there isn't actually that much you need to know. the theory isn't that long & once you learn to be able to use the graphs - that's all there is too it.

Its hard to find the structure in my opinion because the databook and the chemical shifts are not exact, they are approximate. I just find it hard to picture out the structure.

yeah i know that part is a little bit annoying, but just practice a bit and im sure you'll get it.