Catechin - Chemistry - Spectral Data

Spectral Data

UV-Vis
Lambda-max: 276 nm
Extinction coefficient (log ε) 4.01
IR
Major absorption bands 1600 cm−1(benzene rings)
NMR
Proton NMR


(500 MHz, CD3OD):
Reference
d : doublet, dd : doublet of doublets,
m : multiplet, s : singlet

 δ :

2.49 (1H, dd, J = 16.0, 8.6 Hz, H-4a),
2.82 (1H, dd, J = 16.0, 1.6 Hz, H-4b),
3.97 (1H, m, H-3),
4.56 (1H, d, J = 7.8 Hz, H-2),
5.86 (1H, d, J = 2.1 Hz, H-6),
5.92 (1H, d, J = 2.1 Hz, H-8),
6.70 (1H, dd, J = 8.1, 1.8 Hz, H-6′),
6.75 (1H, d, J = 8.1 Hz, H-5′),
6.83 (1H, d, J = 1.8 Hz, H-2′)
Carbon-13 NMR
Other NMR data
MS
Masses of
main fragments		 ESI-MS + m/z : 291.0


273 water loss
139 Retro Diels Alder
123
165
147

Read more about this topic:  Catechin, Chemistry

Famous quotes containing the words spectral and/or data:

    “How does one kill fear, I wonder? How do you shoot a spectre through the heart, slash off its spectral head, take it by its spectral throat?”
    —Joseph Conrad (1857–1924)

    “This city is neither a jungle nor the moon.... In long shot: a cosmic smudge, a conglomerate of bleeding energies. Close up, it is a fairly legible printed circuit, a transistorized labyrinth of beastly tracks, a data bank for asthmatic voice-prints.”
    —Susan Sontag (b. 1933)