Synthesis of chemical compounds of chitosan with betulin under nearly homogeneous conditions

Chemical compounds of chitosan with betulin have been synthesized with the use of chitosan gels in alcoholic and acetic acid dispersions under nearly homogeneous conditions. The resulting biphilic compounds contain up to one betulin residue per 2–3 chitosan units. The formation of chemical compounds of chitosan with betulin has been confirmed by several physicochemical methods. The procedure developed for the preparation of chitosan gels with alcohol-containing dispersion medium makes it possible to carry out chitosan reactions with compounds poorly soluble in aqueous and acetic acid media.