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. 2023 Apr 12;19:434–439. doi: 10.3762/bjoc.19.33

Table 1.

The 13C NMR chemical shifts of C1 and C2 carbon atoms.

graphic file with name Beilstein_J_Org_Chem-19-434-i001.jpg
R = 5 C1 [ppm] 9 C1 [ppm] 5 C2 [ppm] 9 C2 [ppm]
(a) -CH3 89.56 94.72 45.66 47.77
(b) -CH(CH3)2 88.97 93.30 54.77 57.29
(c) -CH2CH(CH3)2 91.33 95.36 48.62 50.22
(d) -CH(CH3)CH2CH3 88.89 92.17 54.45 56.33
(e) -CH2Ph 88.05 94.79 51.39 52.93
graphic file with name Beilstein_J_Org_Chem-19-434-i002.jpg
R = 7 C1 [ppm] 11 C1 [ppm] 7 C2 [ppm] 11 C2 [ppm]
(a) -CH3 49.51 54.13 89.00 92.58
(b) -CH(CH3)2 47.55 50.45 98.03 99.23
(c) -CH2CH(CH3)2 50.00 54.09 92.21 94.76
(d) -CH(CH3)CH2CH3 47.16 49.91 95.16 96.08
(e) -CH2Ph 48.69 53.55 93.24 96.21