Chemistry Forums for Students > Organic Spectroscopy
NMR Help
Garneck:
Ok, I have a problem. My girlfriend has a 1H NMR spectrum of "a probably aromatic ketone" (at least that's what she said). From what I suspect, this compund is benzophenone, you know - two benzene rings connected by a C=O group. All the shifts are over 7 ppm, so that suggests those are aromatic protons.
I can't confirm this on SDBS, because their 90 MHz spectra suck sometimes (yeah, the resolution is crappy when you have too many signals). So, could someone please confrim my suspicion?
Borek:
How??
Garneck:
I don't understand what you mean, Borek.
Don't you see the image?
Borek:
I see now, something was wrong at first. No idea why.
movies:
How many MHz is that spectrum at? If it's 500 MHz then it looks right on for benzophenone. Even the coupling constants work out.
All the peaks are shifted by about 0.15 ppm from the data I have, but that could be from a different solvent or perhaps the spectrum isn't referenced properly to TMS.
I got the data from this book, 3rd ed., p. 219.
http://www.amazon.com/exec/obidos/tg/detail/-/3540678158/
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