Synthesis and study of glycoluril derivatives

Improve and illustrate the etherification of tetramethylol glycoluril using excess of methyl and ethy

Reduction of some cyclic derivatives of diphenic acid with sodium borane in alcohols

Reduction of heptamerous cyclic imides with sodium borane has been carried out for the first time by the example of some imides of diphenic acid. In this case for the first time amides of 2'-hydroxymethylxenyl-2-carboxylic acid which are potentially valued bioactive compounds were obtained. It was shown that the nature of substituent at nitrogen atom influences the reaction products yields and composition. The reduction of diphenic acid anhydride with sodium borane in simple alcohols occurs with the formation of reduction products - 7H-dibenzyl[c,e] oxepin-5-on (36...46 %) as well as products of diphenic acid alcoholysis-monoester (29...36 %). In this case the nature of alcohol influences weakly reaction products rati

Studying the influence of extractants nature in the process of thin-film vapor-phase extraction on composition, degree of extraction and form of obtained products

The technique of thin-film vapor-phase extraction of vegetable raw material has been described. By the example of birch bark the efficiency of the technique for obtaining extractive substances especially of triterpeneiod nature is show

Синтез и исследование новых комплексных соединений нитратов редкоземельных элементов с N-метилгликолурилами

A series of new complex compounds of nitrates of trivalent rare earth elements (lanthanum, cerium, praseodymium, neodymium, samarium, terbium, dysprosium, erbium, ytterbium) with bicyclic bisureas – N-methylglycolurils (N-monomethylglycoluryl, 2,4-N-dimethylglycoluryl, 2,6-N-dimethylglycoluryl, 2,4,6,8-N-tetramethylglycoluryl) as ligands were obtained. IR spectroscopy showed that the rare earth elements (REE) ions are coordinated by two oxygen atoms of two N-methylglycoluryl molecules, three bidentate nitrate anions, and water molecules. N-methylglycolurils realize bidentate, chelating, and bridging functions and tend to form binuclear complexes with rare earth elements. Mass spectrometry with an inductively coupled plasma of synthesized complexes was carried out, and the metal:ligand ratio was ~1:1, respectively. Powder X-ray diffraction allowed us to establish the structures of complex compounds of 2,4,6,8-N-tetramethylglycoluryl with cerium, neodymium, terbium, and dysprosium nitrates. NMR spectroscopy of the obtained complexes was also performed in DMSO-d6 to detect a complex particle in the solution. The resulting complexes are stable in air, however, they are sensitive to trace amounts of water in the solution and are prone to degradation into their original substances

Study of the Hydrocarbon-oxidizing Activity of Bacteria of the Genera Pseudomonas and Rhodococcus

The selective activity of hydrocarbon-oxidizing microorganisms with regard to the degradation of alkanes, cycloalkanes, arenes was presented. The hydrocarbon-oxidizing activity of microorganisms of the genera Rhodococcus and Pseudomonas such as heptane, cyclohexane, toluene within the hydrocarbons destruction was determined. The growth rate for various hydrocarbons differs. Thus, the average specific growth rate of hydrocarbon-oxidizing microorganism (HOM) of the genus Rhodococcus is twice more than these substrates

Polymerization of Lactic Acid Using Microwave and Conventional Heating

The polymerization of lactic acid (LA) has been investigated by two methods: conventional heating and under microwave irradiation. The reactions of polymerization have been carried out in two stages: at the beginning water is removed and oligomer is obtained; then, the catalysts/co-catalysts are added and reactions are carried out. Tin octoate, toluene sulfonic acid, 2-aminopropanoic acid (alanine) have been investigated as polymerization catalysts and the derivatives of 2,4,6,8- tetramethilol -2,4,6,8- tetraazabicyclo[3.3.0]octane -3,7-dion (Tetraol), comprising atoms of Mg, Zn, Al have been synthesized for the first time. The structure of the synthesized catalyst has been investigated using the method of IR, {1}H NMR. It has been shown that the process of obtaining polylactic acid (PLA) by microwave irradiation proceeds hundreds of times faster. PLA samples synthesized by this method have the same optical characteristics as the PLA obtained by conventional heating

Synthesis and study of glycoluril derivatives

Improve and illustrate the etherification of tetramethylol glycoluril using excess of methyl and ethy