Table 3.
Relative percentages of gem‐diol (GD), aldehyde (AL), hemiacetal (HA), sodium carboxylate (SC) and hydroxymethyl (ALC) forms of each imidazolecarboxaldehyde compound obtained from the 1H‐NMR spectra under different experimental conditions.
|
1H‐NMR |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
B1 |
B2 |
B4 |
||||||||
|
Experimental condition |
AL |
HA |
GD |
AL |
HA |
SC |
ALC |
GD |
AL |
HA |
|
0.1 M NaOH in D2O |
100 [29] |
– |
– |
100 |
– |
– |
– |
– |
100 |
– |
|
0.1 M NaOH in CD3OD |
100 |
– |
– |
4 |
– |
60 |
36 |
– |
96 |
4 |
|
0.1 M NaOH in DMSO‐d 6 |
100 |
– |
– |
100 |
– |
– |
– |
– |
100 |
– |