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Proton nmr downfield and upfield
This induced rotation is a circular current whose magnetic field opposes the external field. If all protons were shielded by the same amount, they would all be in resonance at the same combination of frequency and magnetic field. These give more information on the structure of the molecule. How does NMR spectroscopy work? The energy difference between a proton's two spin states is small, but it can be detected by NMR. What 1H coupling patterns singlets, doublets, triplets,etc would you expect from the following compounds?