Table 1.
Time, min | Conversion of betulin (1), % | Products in reaction mixture, % (HPLC, IR and NMR-spectra control) | |||
---|---|---|---|---|---|
Betulinic aldehyde (4) | Betulonic aldehyde (3) | Betulonic acid (2) | Other unknown products | ||
2 | 5 | 15–20 | 55 | – | 20–25 |
5 | 7 | 15 | 50–60 | – | 20–25 |
10 | 12 | 5 | 60 | 10 | 25 |
20 | 17 | – | 60 | 10 | 30 |
65 | 25 | – | 50 | 20 | 30 |
80 | 30 | – | 40 | 30 | 30 |
160 | 37 | – | 35 | 35 | 30 |
300 | 40 | – | 20 | 50 | 30 |
400 | 50 | – | – | 70 | 30 |
150 * | 100 | – | 0–5 | 95–100 | – |
*: The experiment with Al2(SO4)3.