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Table 1 NMR Data for Compounds 1, 3–5 (DMSO-d6, 500 MHz)

From: Flavones from Erythrina falcata are modulators of fear memory

Position 1 3 4 5
  1H NMR (δH) 13C NMR (δC) 1H NMR (δH) 13C NMR (δC) 1H NMR (δH) 13C NMR (δC) 1H NMR (δH) 13C NMR (δC)
2 ----------- 163.9 ----------- ----------- ----------- 163.3 ----------- 163.3
3 6.78 [1H, s] 102.5 6.77 [1H, s] ----------- 6.75 [1H, s] 103.8 6.86 [1H, s] 103.1
4 ----------- 182.2 ----------- ----------- ----------- 182.4 ----------- 181.7
5 ----------- 161.2 13.16 [OH, s] ----------- 13.54 [OH, s] 161.0 8.37 [OH, s] 161.5
6 ----------- 107.6 6.26 [1H, s] ----------- ----------- 109.2 ----------- -----------
7 ----------- 161.3 ----------- ----------- ----------- 163.9 ----------- 163.6
8 ----------- 105.3 ----------- ----------- 6.49 [1H, s] 94.32 6.51 [1H, s] 93.4
9 ----------- 155.1 ----------- ----------- ----------- ----------- ----------- -----------
1′ ----------- 121.5 ----------- ----------- ----------- 121.4 ----------- 123.0
2′ , 6′ 8.02 [2H, d, (6.5)] 129,0 8.03 [2H, d,(10.0)] ----------- 7.91 [2H, d, (8.5)] 128.9 7.55 [2H, d, (8.0)] 109.8
3′ , 5′ 6.91 [2H, d, (8.5)] 115.9 6.89 [2H, d, (10.0)] ----------- 6.92 [2H, d, (9.0)] 116.5 6.94 [2H, d, (8.0)] 115.4
4′ ----------- 161.3 ----------- ----------- ----------- 161.2 3.89 [OCH3] 55.6
1″ 4.71 [1H, d, (9)] 73.4 4.69 [1H, d, (9.5)] ----------- 4.59 [1H, d, (10.0)] 73.6 4.60 [1H, d, (9.5)] 72.9
2″ 3.38 - 3.80 71.0 3.83 – 3.52 ----------- 3.13 -3.89 71.1 3.15- 3.89 69.2
3″ 3.38 - 3.80 78.8 3.83 – 3.52 ----------- 3.13 -3.89 61.9 3.15- 3.89 61
4″ 3.38 - 3.80 69.1 3.83 – 3.52 ----------- 3.13 -3.89 56.6 3.15- 3.89 55.4
5″ 3.38 - 3.80 80.9 3.83 – 3.52 ----------- 3.13 -3.89 81.3 3.15- 3.89 60.8
6″ 3.38 - 3.80 59.8 3.83 – 3.52 ----------- 3.13 -3.89 82.0 3.15- 3.89 69.8
1‴ 4.78 [1H, d, (9.5)] 74.2 ----------- ----------- ----------- ----------- ----------- -----------
2‴ 3.38 - 3.80 71.9 ----------- ----------- ----------- ----------- ----------- -----------
3‴ 3.38 - 3.80 77.9 ----------- ----------- ----------- ----------- ----------- -----------
4‴ 3.38 - 3.80 70.6 ----------- ----------- ----------- ----------- ----------- -----------
5‴ 3.38 - 3.80 81.9 ----------- ----------- ----------- ----------- ----------- -----------
6‴ 3.38 - 3.80 61.3 ----------- ----------- ----------- ----------- ----------- -----------
  1. Chemical shifts (δ) are in ppm and coupling constants (J em Hz) are given in parentheses.