[en] Aminoacyl derivatives of 3-phenoxychromone have been synthesized. Electron paramagnetic resonance spectra of title compound have been recorded. The chemical and physical properties are discussed

[en] Benzodioxane analogs of chalcones and their epoxides have been prepared. Different types of analogs of natural flavonolignan - silibin - have been synthesized from these compounds. The PMR spectra of the new compounds and the results of the preliminary biological testings are reported and discussed

[en] We have studied some peculiarities of the spectral-fluorescent properties of the natural compound - umbelliferone and herniarin - in aprotonic and proton donor solvent of different polarity, Based on quantum chemical analysis performed by the semiempirical AM1 method, when considering changes of the electronic charge and orders of bonds. In the ground and first excited states, we have interpreted the anomalously high Stokes shifts and mirror symmetry of the absorption and fluorescence bands for these compounds in aprotonic solvents. It is established that the fluorescence spectra of umbelliferone in water, ethanol, alkaline and acidic solutions, differ greatly from such spectra for herniarin. This is related to the detachment and transfer of the proton in the neutral form of umbelliferone. upon photoexcitation, which is accompanied by the possible formation of the anion, cation and tautomer, depending on pH of media. A good agreement between the calculated and experimental values of maxima of electronic bands of these forms is achieved. (authors)