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Table 1 1H and 13C NMR data for the phthalide nucleus of 18 (CDCl3, δ in ppm, J in Hz)*

From: Novel phthalide derivatives identified from Ligusticum chuanxiong (Chuanxiong)

Position 1/3/5 2/4/6   7   8  
δ C δ H δ C δ H δ C δ H δ C δ H
1 167.7   168.9   169.6   169.4  
3 148.2   148.3   148.3   148.1  
3a 155.2   152.9   153.7   153.3  
4 17.8 2.48 (dt, 18.5, 5.4) 2.62 (dt, 18.5, 6.9) 18.3 2.51 18.9 2.41 2.63 (dt, 18.5, 5.8) 19.1 2.51
5 25.8 1.99 23.1 2.00 2.10 25.5 1.82 2.08 26.5 1.88 2.06
6 68.5 4.08 (dt, 6.0, 3.9) 72.3 5.10 67.9 4.00 71.7 3.93
7 67.5 5.53 (d, 3.9) 63.4 4.56 (d, 3.9) 63.0 4.59 (d, 3.0) 67.6 4.44 (d, 5.5)
7a 122.3   125.6   125.7   125.9  
8 114.3 5.31 (t, 7.9) 114.5 5.31 (t, 7.9) 114.7 5.30 (t, 7.9) 114.6 5.28 (t, 7.9)
9 28.2 2.36 28.3 2.37 28.2 2.34 28.2 2.33
10 22.4 1.50 22.4 1.51 22.4 1.49 22.4 1.47
11 13.9 0.95 (t, 7.4) 13.9 0.96 (t, 7.4) 13.9 0.94 (t, 7.4) 13.9 0.93 (t, 7.3)
  1. * Indiscernible signals owing to overlapping or having complex multiplicity are reported without designating multiplicity