More NMR (LS) - Other NMR Topics Carbon Nuclear Magnetic...

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Lecture Supplement: Other NMR Topics 33 Other NMR Topics Carbon Nuclear Magnetic Resonance ( 13 C-NMR) Sample Spectrum (broadband decoupled) Characteristic Carbon NMR Chemical Shifts (ppm) R C H 3 0 – 40 R C H 2 Cl 35 – 80 benzene ring 110 – 160 R C H 2 R 15 – 55 R 3 C OH 40 – 80 C =O ester 160 – 180 R 3 C H 20 – 60 R 3 C OR 40 - 80 C =O amide 165 – 180 R C H 2 I 0 – 40 R C C R 65 – 85 C =O carboxylic acid 175 – 185 R C H 2 Br 25 - 65 R 2 C = C R 2 100 - 150 C =O aldehyde, ketone 180 – 210 (CH 3 ) 4 Si = TMS = 0.00 ppm CDCl 3 (solvent) = 77.0 ppm (triplet) The exact chemical shift for each carbon type does not need to be memorized. It will be provided on an exam if needed.
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34 Lecture Supplement: Other NMR Topics D istortionless E nhancement by P olarization T ransfer (DEPT) NMR Spectrum Assigns each 13 C-NMR signal as methyl, methylene, methine or quaternary carbon Sample compound: CH 3 O Broadband decoupled: All C-H coupling "turned off" CH 3 only:
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Lecture Supplement: Other NMR Topics 35 CH 2 only: CH only:
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More NMR (LS) - Other NMR Topics Carbon Nuclear Magnetic...

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