Table 1.
Coupling constants 3 J H,H and 1 J C,H for the altropyranose residue (A) as monosaccharides and present in selected AB disaccharides.
|
Entry |
Compound |
1 J C1,H1 (Hz) |
3 J H,H (Hz) |
|||
|---|---|---|---|---|---|---|
|
|
|
|
J 1,2 |
J 2,3 |
J 3,4 |
J 4,5 |
|
1 [24] |
12 |
170 |
<1 |
2.9 |
2.9 |
9.4 |
|
2 |
10 |
172 |
4.0 |
4.0 |
4.4 |
9.6 |
|
3a |
11 |
170 |
<1 |
– |
– |
8.8 |
|
4 |
23 |
169 |
7.2 |
11.2 |
3.6 |
3.6 |
|
5 |
17 (βA) |
173 |
8.7 |
3.1 |
2.3 |
9.6 |
|
6 |
18 (αA) |
173 |
5.6 |
4.8 |
4.8 |
8.8 |
|
7a |
21 |
169 |
<1 |
– |
– |
8.0 |
|
8 |
26 |
171 |
7.6 |
11.2 |
3.9 |
2.8 |
[a] Poorly resolved spectra.