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Addition of solvent in H NMR help
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(Original post by alow)
It's next to two electronegative groups so will be more shifted than either.
It's next to two electronegative groups so will be more shifted than either.
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#4
(Original post by coconut64)
so what bond would it be? Thanks
so what bond would it be? Thanks
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(Original post by MexicanKeith)
It's both, so its chemical shift will be above both of the ones you're given for those two different functional groups
It's both, so its chemical shift will be above both of the ones you're given for those two different functional groups
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#6
(Original post by coconut64)
so the chemical shift value will just be in between the two functional groups then?
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so the chemical shift value will just be in between the two functional groups then?
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(Original post by MexicanKeith)
Nope, each group separately causes the chemical shift to be greater than for protons in an alkane. So when both groups are present these effects combine and the shift is higher than either of the functional groups would be on their own.
Nope, each group separately causes the chemical shift to be greater than for protons in an alkane. So when both groups are present these effects combine and the shift is higher than either of the functional groups would be on their own.
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#8
(Original post by coconut64)
How much higher or just higher?
How much higher or just higher?
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(Original post by MexicanKeith)
As an estimate it would be around 5ppm so just a bit above where a proton next to an alcohol would be. The sorts of tables they give you at a level you can only ever be approximate and even computers aren't that great at predicting chemical shifts for molecules that aren't really simple!
As an estimate it would be around 5ppm so just a bit above where a proton next to an alcohol would be. The sorts of tables they give you at a level you can only ever be approximate and even computers aren't that great at predicting chemical shifts for molecules that aren't really simple!
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