in this research work, we report the synthesis of macrocyclic diamides from the reaction of diesters and aliphatic diamines in the presence of caesium carbonate. it has been demonstrated that among the carbonate of alkali metals (li2co3, na2co3, k2co3 and cs2co3), cs2co3 appear to be the best catalyst for macrocyclization. diesters with different substitution patterns on the aromatic ring react...

The influence of the concentration of sodium, lithium, caesium, and potassium ions as well as of the ionic strength of the solutions used on the dismutation rate of ascorbyl radicals has been investigated. While the dismutation rate was not influenced by Li+, it decreased, however, with increasing concentrations of the other ions investigated. The largest effect was obtained with Na+. This chan...

The title compound, C14H18N4O, synthesized from an unconventional microwave-assisted method using caesium carbonate as catalyst, has an approximately planar conformation with the pyridyl and pyrazole rings inclined by a dihedral angle of 7.94 (3)°, allowing the formation of an intra-molecular N-H⋯N hydrogen bond. The supra-molecular assembly has a three-dimensional arrangement controlled mainly...

The title compound, C(43)H(45)NO(12), was prepared from the reaction of 2,6-bis-(dibromo-meth-yl)pyridine and bis-phenol in the presence of caesium carbonate as a base. The central ring makes dihedral angles of 64.83 (6), 13.48 (6), 56.96 (6) and 66.21 (6)° with the peripheral rings. In the crystal, mol-ecules are linked by weak C-H⋯O and C-H⋯π inter-actions, forming a folded structure.

The article gives research data of indicators sanitary state the soils in Rivne region as for content microelements and heavy metals, such boron, manganese, zinc, cupre, plumb, cadmium, radiative caesium-137 soils, density radon flow out their surface, level its ecological safety. It is recommended to carry estimation safety districts, stimulators boron manganese according dependencies which ha...