1. Analysis of C-13 NMR Spectra
New for this specification

2. How it works
Carbon-13 makes up 1.1% of all naturally occurring carbon atoms.
Carbon-13 has 13 nucleons, an odd number so it has a residual magnetic spin.
i.e. it shows up on NMR.
Carbon -13 atoms in different environments have different chemical shifts.
There are no integrals

3. Carbon-13 chemical shifts

4. Some C-13 Chemical Shifts
1o Alkyl RCH ppm
2o Alkyl RCH2R ppm
3o Alkyl RCHR ppm
Alkyl Halide C-X ppm
Alcohol or ether C-O ppm
Alkenes and
Aromatics C=C ppm Amides CO)N ppm
Carboxylic Acids RCOOH
Aldehydes/
Ketones (CO) ppm

5. Propan-1-ol

6. Propan-1-ol

7. Propan-2-ol

8. Propan-2-ol

9. 2-bromopropane

11. Ethyl methanol

12. The reasons for using C-13 spectra are; Fewer peaks to sort out
The reasons for using C-13 spectra are; Fewer peaks to sort out. Better separation of certain peaks, like benzene Never any coupling

13. Isomer
Carbon environments
Ring environment 4 3 5 2 6 1 1 1 1 1 1 1