C-13 NMR Spectroscopy CHM 320 La Salle University

C-13 Spectrum of m-Nitroacetophenone

1H NMR Spectrum of Ethylbenzene

Typical ppm (  )  Ranges in C-13 NMR

Relaxation Times

Coupling Constants are Large J Values measured in Hz

Silverstein, p. 212

Silverstein, p. 215

Predicting Chemical Shifts

Predicted Chemical Shifts of C a and C b

2,2,4-Trimethylpentane  53.28, 31.10, 30.16, 25.51, 24.73

Chemical Shift Prediction with Functional Groups

Use Base Value From Table 4.5

You can Choose Which Base Value from Table 4.5 to Use

Spectrum at 75 MHz and 150 MHz