Thread: HNMR chemical shift characteristic?
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Unread 01-09-2005, 01:40 AM
Filumena M Filumena M is offline
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Default HNMR chemical shift characteristic?
Hi, I'm trying to justify why that specific proton has such chemical shift characteristic.The molecule I'm working with is cyclopentadiene. I know that two protons attached on one of five carbon has 2.89ppm and the proton attached to the next carbon has 6.46ppm and the one on next carbon has 6.57ppm. I can't seem to justify the reason for that pattern.Another molecule is anisole. The methiyl group attached to the ester oxygen has 3.79ppm and the proton attached to carbon that is at ortho position with oxygen has 6.88ppm and the next proton(meta position) is 7.29ppm and the next one (para position with oxygen) is 6.92ppm. The pattern also doesn't make sense to me.Third molecule is acetophenone and the pattern of chemical shift seems to make sense to me since further the proton from the ketone oxygen decrease in chemical shift. can you please help me with explaining why?
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