FIELD: chemistry.
SUBSTANCE: invention relates to a method of obtaining allobetulin (19β,28-epoxy-18α-oleanan-3β-ol) by the isomerisation of betulin under the action of an acidic agent in an organic solvent, with isomerisation being carried out in chloroform under the action of a strong acidic cationite Amberlist 15, which contains strong acidic sulphogroup in its structure, at 25°C for 5 h.
EFFECT: method makes it possible to obtain allobetulin with the higher output, simplify the procedure of the product separation up to the cationite filtration and the solvent removal, and regenerate the catalyst many times.
1 ex
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