High resolution proton NMR (H’s) 13C NMR
1. Environments CH3CH2COOCH3 = positions of 13C in a molecule
No. of peaks = no. of H environments Same steps as high resolution proton NMR (H’s)
3 environments
∴ 3 peaks
2. Relative intensity of peaks
No. of H’s in each environment = intensity
1 = 3xH ∴ 3 : 2 : 3
2 = 2xH
3 = 3xH
3. Chemical shift
How much the field shifted from the field for TMS
⤷ TMS calibrates spectrum (peak at 0)
⤷ Used because it’s non-toxic, inert, low BPT (easy to
remove), 1 peak (1 environment) ect.
⤷ Chemical shifts are in data booklet
R-CH3 → 0.7-1.6
-O-CH3 → 3.3-4.3
R-CH2-C=O →3.0-2.9
4. Splitting
No. of peaks = no. of adjacent H’s +1
1. Environments CH3CH2COOCH3 = positions of 13C in a molecule
No. of peaks = no. of H environments Same steps as high resolution proton NMR (H’s)
3 environments
∴ 3 peaks
2. Relative intensity of peaks
No. of H’s in each environment = intensity
1 = 3xH ∴ 3 : 2 : 3
2 = 2xH
3 = 3xH
3. Chemical shift
How much the field shifted from the field for TMS
⤷ TMS calibrates spectrum (peak at 0)
⤷ Used because it’s non-toxic, inert, low BPT (easy to
remove), 1 peak (1 environment) ect.
⤷ Chemical shifts are in data booklet
R-CH3 → 0.7-1.6
-O-CH3 → 3.3-4.3
R-CH2-C=O →3.0-2.9
4. Splitting
No. of peaks = no. of adjacent H’s +1
