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Table 1 Summarizes pertinent 1 H and 13 C NMR spectral data and assignments

From: Chemical characterization and antioxidative activity of four 3-hydroxyl-3-methylglutaroyl (HMG)-substituted flavonoid glycosides from Graptopetalum paraguayense E. Walther

Position Compound 1 Compound 2 Compound 3 Compound 4
(in Acetone-d6) (in Acetone-d6) (in Acetone-d6) (in Acetone-d6)
  δ H δ C δ H δ C δ H δ C δ H δ C
2   158.4   158.6   158.0   158.1
3   135.2   133.3   134.4   134.2
4   178.9   177.4   178.5   178.6
5   162.6   161.2   162.8   162.8
6 6.28 (1H, d, 1.8) 99.5 6.28 (1H, d, 1.8) 98.8 6.26 (1H, d, 1.8) 99.4 6.26 (1H, d, 1.8) 98.2
7   165.1   164.2   164.8   164.8
8 6.52 (1H, d, 1.8) 94.6 6.52 (1H, d, 1.8) 93.7 6.49 (1H, d, 1.8) 94.4 6.50 (1H, d, 1.8) 93.5
9   157.8   156.5   157.8   157.8
10   105.4   104.1   105.5   103.1
1’   122.7   120.9   122.8   121.7
2’ 7.77(1H, d, 1.8) 117.2 8.12 (1H, d, 9.0) 130.7 7.76(1H, d, 2.4) 117.1 8.08 (1H, d, 9.0) 132.0
3’   145.2 6.96 (1H, d, 8.4) 115.1   145.2 6.97 (1H, d, 9.0) 115.4
4’   149.1   160.0   148.9   160.8
5’ 6.94 (1H, d, 8.4) 115.6 6.96 (1H, d, 8.4 115.1 6.95 (1H, d, 8.4) 115.7 6.97 (1H, d, 9.0) 115.4
6’ 7.68 (1H, dd, 1.8,8.4) 123.1 8.12 (1H, d, 9.0) 130.7 7.63 (1H, dd, 2.4,8.4) 123.0 8.08 (1H, d, 9.0) 132.0
1” 5.30 (1H, d, 7.2) 104.2 5.28 (1H, d, 7.8) 101.3 5.61 (1H, d, 7.8) 100.2 5.62 (1H, d, 7.8) 100.1
2” 3.40-3.52 (1H, m) 75.2 3.45 (1H, dd, 7.8, 9.0) 74.1 5.01 (1H, dd, 7.8, 9.6) 75.0 4.97 (1H, dd, 8.4, 9.6) 74.8
3” 3.40-3.52 (1H, m) 77.7 3.40 (1H, t, 9.0) 76.4 3.70 (1H, t, 9.0) 75.3 3.68 (1H, t, 9.0) 75.2
4” 3.40-3.52 (1H, m) 70.6 3.48-3.54 (1H, m) 70.1 3.42 (1H, dd, 9.0, 9.6) 71.0 3.46 (1H, dd, 9.0, 9.6) 71.2
5” 3.40-3.52 (1H, m) 75.1 3.48-3.54 (1H, m) 74.1 3.55 (1H, dd, 1.8, 7.8) 74.9 3.54 (1H, dd, 1.8, 7.8) 75.0
6” 4.11 (1H, dd, 5.4, 12.0) 64.0 4.10 (1H, dd, 6.0, 12.0) 63.2 4.12 (1H, dd, 5.4, 12.0) 63.7 4.10 (1H, dd, 5.4, 12.0) 63.8
4.22 (1H, dd, 1.8, 12.0) 4.22 (1H, dd, 1.8, 12.0) 4.24 (1H, dd, 1.8, 12.0) 4.22 (1H, dd, 1.8, 12.0)
1”’   171.6   170.0   171.5   171.4
2”’ 2.52 (1H, d, 14.4, H-2”’A or H-2”’B) 45.7 2.51 (1H, d, 14.4, H-2”’A or H-2”’B) 45.7 2.51 (1H, d, 13.8, H-2”’A or H-2”’B) 45.7 2.48 (1H, d, 13.8, H-2”’A or H-2”’B) 45.7
2.56 (1H, d, 14.4, H-2”’A or H-2”’B ) 2.56 (1H, d, 14.4, H-2”’A or H-2”’B ) 2.54 (1H, d, 13.8, H-2”’A or H-2”’B ) 2.51 (1H, d, 13.8, H-2”’A or H-2”’B )
3”’   69.9   68.7   69.9   69.9
4”’ 2.50 (1H, d, 15.6, H-4‘”A or H-4”’B) 45.1 2.52 (1H, d, 15.6, H-4”’A or H-4”’B) 44.9 2.48 (1H, d,15.6, H-4”’A or H-4”’B) 45.1 2.47 (1H, d, 15.6, H-4”’A or H-4”’B) 45.0
2.59 (1H, d, 15.6, H-4”’A or H-4”’B) 2.59 (1H, d, 15.6, H-4”’A or H-4”’B) 2.56 (1H, d, 15.6, H-4”’A or H-4”’B) 2.54 (1H, d, 15.6, H-4”’A or H-4”’B)
5”’   173.6   172.2   173.5   173.4
6”’ 1.23 (3H, s) 27.5 1.24(3H, s) 27.0 1.20 (3H, s) 27.5 1.19 (3H, s) 27.4
1””       170.5   170.3
2””      2.10 (3H, s) 21.1 2.10 (3H, s) 21.0