Chemical shift Coupling constanta 13C enrichment
Position 13C δ (ppm) JCC (Hz) % 13Crel.b % 13C13C c
           
1 152.50 66.9  (6) 1.10 28.57
    8.3  (4)    
2 131.34 59.9  (3) 1.24 27.01
3 126.23 59.8  (2) 1.12 22.48
    2.5  (9)    
4 121.67 8.4  (1) 1.24 16.67
5 136.66 44.4  (10) 1.17 19.35
6 116.00 66.6  (1) 1.34 21.26
7 26.70 34.6  (8) 1.24 23.66
 8/9 22.71 34.5  (7) 1.47 13.79
    2.6  (3)    
10 20.91 44.2  (5) 1.16 22.48
aThe numbers in parentheses indicate the coupling partners
bThe signal with the lowest 13C enrichment is referenced to 1.10% 13C
cFraction of the indexed coupling pair in the overall signal intensity of the respective 13C NMR signal
Table 2: 13C-NMR data of thymol obtained from T. transcaucasicus flowers labelled with 13CO2 for four hours and extracted with chloroform 12 days after the labelling pulse. The solvent was CDCl3.