The results of x-ray diffraction measurehens of a lead magnoniobate single crystal-PbMglpNb2/jO3, performed on a four-circle diffractometer with MO Kci radiation. are described. It is'confirmed that even at relatively high temperatures lead ions are shifted from the highaymetry position. It is shown that these shifts are random both in length and direction. A spherical layer model is proposed for the adequate description of the experimental data. The correspondence between the crystal structure and the physical properties of the crystal is discussed.

An effective technique for one-stage synthesis of new polycyclic nitrogen-containing compounds has been developed. The procedure involves refluxing mixtures of camphoric acid with aliphatic or aromatic diamine without catalysts. In cases where the starting amine has a low boiling point (less than 200 °C), phenol is used as a solvent, as it is the most optimal one for obtaining products with good yields. It has been shown that the use of Lewis acids as catalysts reduces the yield of the reaction products. A set of compounds have been synthesized, which can be attributed to synthetic analogues of alkaloids. In vitro screening for activity influenza virus A was carried out for the obtained compounds. The synthesized quinazolinelike agent 14 has inhibitory activity against different strains of influenza viruses.

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