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Re: proton NMR
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anhydride
Jan 17, 2007, 5:30:56 AM1/17/07
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sara...@gmail.com wrote:
> I am just learning about proton NMR, and i understand why protons
> adjacent to a benzene ring are deshielded and thus have a higher shift
> than expected. I am having troubole understanding why this shift is so
> much higher, than say, the terminal proton in acetylene. Any thoughts?
> thanks
> I am just learning about proton NMR, and i understand why protons
> adjacent to a benzene ring are deshielded and thus have a higher shift
> than expected. I am having troubole understanding why this shift is so
> much higher, than say, the terminal proton in acetylene. Any thoughts?
> thanks
Make a MO model of both and I think you will see that the electron
density around the terminal atom in acetylene is a lot greater than the
with the delocalized pi orbitals in benzene. You've probably forgotten
this stuff; it's usually 1st quarter organic chem material...
How do you like proton NMR? I've never had access to the machine but
regular NMR's are getting cheaper because of it so I might be able to
buy one soon ;^)
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