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Quick H NMR Question?

For the H NMR of propyl methanoate, I have predicted 4 different proton environments (H-C=O, O-CH2, CH2-CH2-CH3, CH2-CH3)

Can someone confirm if this is correct or not please?

Reply 1

nutcase13

Original post by popo111

For the H NMR of propyl methanoate, I have predicted 4 different proton environments (H-C=O, O-CH2, CH2-CH2-CH3, CH2-CH3)

Can someone confirm if this is correct or not please?

yep thats what i got aswell

Reply 2

Es0phagus

I would say 4 is correct.

Reply 3

popo111

Original post by nutcase13

yep thats what i got aswell

Ok thanks!

For the last 2 ones, would you recommend to write it like that or shall I just write R-CH2 and R-CH3? It wouldn't really make a difference would it?

Reply 4

nutcase13

Original post by popo111

Ok thanks!

For the last 2 ones, would you recommend to write it like that or shall I just write R-CH2 and R-CH3? It wouldn't really make a difference would it?

i dont think it would make a difference tbh, although if you just wrote it out as CH2 there may be confusion as to which one of the CH2's you are referring to, so maybe your way is better?

Reply 5

popo111

Original post by nutcase13

i dont think it would make a difference tbh, although if you just wrote it out as CH2 there may be confusion as to which one of the CH2's you are referring to, so maybe your way is better?

Ok cool!

Last thing, I'm slightly confused, for the H-C=0 group, is it at 9-10 chemical shift? (not the HC-C=0)?

Reply 6

nutcase13

Original post by popo111

Ok cool!

Last thing, I'm slightly confused, for the H-C=0 group, is it at 9-10 chemical shift? (not the HC-C=0)?

yep looks like it

Reply 7

Pigster

You can usually look them up, here:http://sdbs.db.aist.go.jp/
But propyl formate's NMR is missing.

Instead, you can predict it, here:
http://www.nmrdb.org/