Synthesis of 2-alkyl(aralkyl)sulfanyl-6-methylpyrimidin-4(3<Emphasis Type="Italic">H</Emphasis>)-ones and 4-alkyl(aralkyl)oxy-2-alkyl(aralkyl)sulfanyl-6-methylpyrimidines

2-Alkyl(aralkyl)sulfanyl-6-methylpyrimidin-4(3H)-ones and 4-alkyl(aralkyl)oxy-2-alkyl(aralkyl)-sulfanyl-6-methylpyrimidines having similar or different substituents on the sulfur and oxygen atoms were synthesized by alkylation of sodium salts derived from 6-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one and 2-alkyl(aralkyl)sulfanyl-6-methylpyrimidin-4(3H)-ones with alkyl (propyl, ethyl, allyl) and aralkyl [benzyl, m-phenoxybenzyl, p-(1-adamantylbenzyl)] halides. The effects of the alkyl (aralkyl) halide nature and solvent polarity on the rate of nucleophilic substitution and product yield were studied.     

P-odd,T-even symmetries for products of the spontaneous fissioning of oriented nuclei

P-Odd, T-even asymmetries in angular distributions of products from the binary and ternary spontaneous fissioning of nuclei oriented in strong magnetic fields at ultralow temperature are described for the first time by means of the quantum theory of fission. Using the spin density matrix of a fissioning nucleus and considering the notable octupole deformations of the nucleus that appear in the vicinity of its scission point, we show that coefficients of the asymmetries in question are governed by the orientation parameters of a fissioning nucleus with Q = 1 and Q = 3. The coefficients obtained in this work are compared to the analogous coefficients in the fissioning of unoriented target nuclei by polarized neutrons and oriented target nuclei by unpolarized neutrons.     

The efficiency of using fluorine-containing surfactants for property modification of polyurethanes filled with chalk

The efficiency of using fluorine-containing surfactants for increasing the sedimentation stability of filled compositions, uniformity of the disperse-phase distribution in oligomer, and hydrophobization of the cured polyurethane surface is shown.     

One-step synthesis of 2-aminobenz[kl]acridines by reaction of 1-nitroacridones with malononitrile

Reaction of 1-nitro-and 10-methyl-1-nitro-9-acridone with malononitrile leads directly to the corresponding 2-amino-1,3-dicyanobenz[kl]acridines.     

Alumina ceramics for stomatologic purposes

An alumoxide ceramic implant doped with magnesium oxide is developed and its structure and physicochemical and mechanical properties are examined. Medicobiologic investigations of the implant are also carried out. The implant Alumag-1 is recommended for clinical testing.