Table 1.

Time distribution of selectivity in betulin oxidation without Al₂(SO₄)₃ at molar ratio ν _Cr⁶⁺/ ν_betulin equal to 3 in acetone at room temperature.

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.