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Table 1 1H-NMR data of polyphenols isolated from Acacia hydaspica (Coupling constant J in Hertz)

From: Antioxidant activity of polyphenolic compounds isolated from ethyl-acetate fraction of Acacia hydaspica R. Parker

Proton 7-O-galloyl catechin
δ in ppm
(C1)a
(+)-catechin
δ in ppm
(C2)a
Methyl gallate
δ in ppm
(C3)b
H-2 4.61 (d, J = 7.0 Hz) 4.46 (d, J = 7.6 Hz) 7.11 (s)
H-3 3.88–3.94 (m) 3.79–3.82 (m) 3.79 (s, OCH3)
H-4α
b
2.71 (dd, J = 16.3 Hz, J = 5.3 Hz)
2.45 (dd, J = 16.5, 7.9 Hz)
2.64 (dd, J = 16.4, 5.3 Hz)
2.33 (dd, J = 16.1, 7.9 Hz)
H-6 6.11 (d, J = 2.2 Hz) 5.67 (d, J = 2.3 Hz) 7.11 (s)
H-8 6.17 (d, J = 2.2 Hz 5.87 (d, J = 1.8 Hz)
H-2′ 6.72 (d, J = 1.5 Hz) 6.70 (d, J = 1.8)
H-5′ 6.68 (d, J = 8.1 Hz) 6.67 (d, J = 8.2 Hz)
H-6′ 6.60 (dd, J = 8.1 Hz, J = 1.5 Hz) 6.57 (dd, J = 8.2 Hz, J = 1.8 Hz)
OH-3 5.01 (d, J = 5.1 Hz) 4.84 (d, J = 4.7 Hz)
Galloyl 7.04 (s)
  1. Coupling constants (Hz) in parenthesis, a DMSO-d6 b indicates acetone–d6. Dashes indicate that given proton is absent the molecule