Table 3:
Selected
1
H NMR data for 2,4-
cis
-7-hydroxyflavan-4-ol
(4)
, 2,4-
trans
-5,7-dihydroxyflavan-4-ol
(5)
, and 2,4-
cis
-flavan-4-ol.
δ
H-2
δ
H-4
δ
H-3
ax
δ
H-3
eq
𝐽
3
a
x
-
3
e
q
𝐽
2
-
3
a
x
𝐽
2
-
3
e
q
𝐽
4
-
3
a
x
𝐽
4
-
3
e
q
2,4-
cis
-Flavan-4-ol
5.17
5.08
2.13
2.51
13.06
11.62
1.83
10.59
6.27
2,4-
cis
-7-Hydroxyflavan-4-ol (
4
)
5.15
5.03
2.09
2.49
13.20
11.30
1.80
9.90
6.20
2,4-
trans
-5,7-Dihydroxyflavan-4-ol (
5
)
5.22
5.52
3.05
2.89
16.90
8.40
16.70
13.30
2.90