1. C13 NUCLEAR MAGNETIC RESONANCE (NMR)

2. 13C NMR
C13 resonances occur from 0 to 200 ppm (δ). These peaks are split by the attached hydrogens. However, proton decoupled (broadband) spectra are not split by H.

3. 13C NMR
Distortionless enhancement by polarization transfer (DEPT) spectra permit identification of CH3, CH2, and CH carbon atoms. DEPT 45 shows 1o, 2o,and 3o carbons. DEPT 90 shows only 3o carbons. DEPT 135 shows 1o and 3o carbons as positive peaks and 2o carbons as negative peaks.

4. 13C NMR

5. 13C Off-resonance decoupled spectrum

6. 13C Off-resonance & Broadband decoupled spectra

7. 13C Broadband decoupled spectrum

8. 13C NMR – n-Hexane
Broadband

9. 13C NMR – Acetone
Broadband

10. 1H & 13C NMR: 1,1,2-trichloropropane
Broadband

11. 1H & 13C NMR: 2-methyl-2-butene
Broadband

12. 1H & 13C NMR: 2-methyl-1-butene
Broadband

13. 13C NMR – 6-methyl-5-hepten-2-ol
Broadband
All carbons as singlets

14. 13C NMR – 6-methyl-5-hepten-2-ol
DEPT 90
Only CH carbons

15. 13C NMR – 6-methyl-5-hepten-2-ol
DEPT 135
Methyl and CH positive
Methylene negative

16. END C13 NMR