NMR_Basic_Rules - Nuclear Magnetic Resonance...

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Nuclear Magnetic Resonance Spectroscopy (NMR) Spectrum represents the different interactions of stereochemically different protons ( 1 H) with the applied magnetic field. We will focus on 1 H NMR (proton, H + ) 4 general rules for 1 H NMR spectra 1. Only stereochemically different 1 Hs give different signals. 2. Area covered under the signal is proportional to the number of 1 Hs causing the signal and is usually represented by integrals. 3. The Chemical Shift (where on spectrum each peak appears) depends on the “chemical environment” of each proton. (see above picture) a. 1 Hs close to electronegative atoms (O, N, X (halogen)) or aromatics shift to the left (deshielded, downfield shifted) b. The larger the number of 1 Hs on the same carbon the more to the right (shielded, upfield shifted) the NMR signal is. CH 3 CH 2 -Cl Different H Different NMR signal CH 3 CH 2 CH 2 CH 3 Different H Different NMR signal Same H, symmetric Same H, symmetric Br Br 0 1 2 3 4 5 6 PPM 1 2 3
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4. The multiplicity of the NMR peak depends on the number of
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This note was uploaded on 03/19/2008 for the course CEM 252 taught by Professor Rathke during the Spring '08 term at Michigan State University.

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NMR_Basic_Rules - Nuclear Magnetic Resonance...

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