HNMR (LS) - Proton Nuclear Magnetic Resonance Spectroscopy...

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Lecture Supplement: Proton NMR 25 Proton Nuclear Magnetic Resonance Spectroscopy ( 1 H-NMR) If the proton is placed in an external magnetic field, the proton's magnetic moment becomes aligned with the external field (lower energy) or against it (higher energy). External magnetic field No external magnetic field With external magnetic field Addition of energy (radio wave photons) results in nuclear spin flip: Energy Spin parallel to external field Spin antiparallel to external field E = radio wave energy Schematic NMR spectrum: downfield low magnetic field strength upfield high magnetic field strength Intensity NMR signal
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26 Lecture Supplement: Proton NMR Characteristic Proton NMR Chemical Shifts (ppm) RC H 3 0.9 RC C H 2.5 RC H O, ArC H O 9.5 – 11 RC H 2 R acyclic 1.3 RNHC H 3 2 – 3 RN H 2 1 – 3 RC H 2 R cyclic 1.5 RC H 2 X (X = Cl, Br, I) 3.5 ArN H 2 3 – 5 R 3 C H 1.5 – 2.0 RO C H 3 O ROC H 3 , 3.8 RN O R H 5 – 9 RR C H 3 R 1.8 R 2 C=C H 2 5.0 RO H 1 – 5 RC H 3 O 2.0 – 2.3 RC H =CR 2 5.3 ArO H 4 – 7 ArC H 3 2.3 Ar H 6.5 - 8
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This note was uploaded on 03/09/2010 for the course CHEM 30B Chem 30B U taught by Professor Miguelgarciagaribay during the Summer '10 term at UCLA.

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HNMR (LS) - Proton Nuclear Magnetic Resonance Spectroscopy...

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