Synthesis of nitrogen analogs of phenvalerate

Conclusions Syntheses were reported for new nitrogen analogs of phenvalerate, which possess a synergistic effect to pyrethroids.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1694–1696, July, 1989.     

Some modern aspects of the theory of impulsive differential equations

We give a brief survey of the main results obtained in recent years in the theory of impulsive differential equations. __________ Translated from Ukrains’kyi Matematychnyi Zhurnal, Vol. 60, No. 1, pp. 81–94, January, 2008.     

Controlled synthesis of acrylic homo- and copolymers in the presence of trithiocarbonates as reversible addition-fragmentation chain transfer agents

Formation of homo- and copolymers of various structures (random and block) based on tert-butyl acrylate and n-butyl acrylate via polymerization mediated by trithiocarbonates as reversible addition-fragmentation chain-transfer agents has been studied. The process is found to proceed according to a three-stage mechanism. As a result, it is possible to synthesize symmetric triblock copolymers with the use of polymer trithiocarbonates; the polymer reversible addition-fragmentation chain transfer agent predetermines the composition and molecular mass of end blocks, the composition of the monomer mixture determines the structure of the central block, and the concentration of the agent and the conversion of the monomers define its molecular-mass characteristics. The modification of polymerization products gives rise to amphiphilic copolymers.     

Chemical Properties of 6-Methyluracil-5-carbaldehyde Oxime

Russian Journal of Organic Chemistry - Oxidative chlorination of 6-methyluracil-5-carbaldehyde oxime in a two-phase system gave 7V-hydroxy-6-methyluracil-5-carboximidoyl chloride, and its...     

Microbial enzymes mined from the Urania deep-sea hypersaline anoxic basin

We created a metagenome expression library from the brine:seawater interface of the Urania hypersaline basin, screened it for esterases, and characterized five of these. Two had no significant sequence homology to known esterases, hydrolyzed both carboxylesters and thioesters, and exhibited unusual, habitat-specific characteristics (preference for high hydrostatic pressure and salinity). One has an unusual structural signature incorporating three catalytic active centers mediating distinct hydrolytic activities and an adaptive tertiary-quaternary structure that alters between three molecular states, according to the prevailing physicochemical conditions. Some of the esterases have high activities, specificities, enantioselectivities, and exceptional stability in polar solvents, and they are therefore potentially useful for industrial biotransformations. One possesses the highest enantioselectivity toward an ester of the important chiral synthon solketal (E: 126[S]; 98%ee).     

Unusual electronic state for iron in the superconductor

Institute of Inorganic Chemistry, Siberian Branch, USSR Academy of Sciences. Translated from Zhurnal Strukturnoi Khimii, Vol. 30, No. 2, pp. 190–193, March–April, 1989.     

On invariance of some properties of solutions under perturbation of a pulse system of differential equations

Sufficient conditions for the invariance of boundedness and stability properties of solutions under perturbation of a pulse system of differential equations are established.Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 46, No. 12, pp. 1707–1713, December, 1994.     

Pyrimidines

A new method was developed for the preparation of 1,3-diarylbenzo[f]quinazolines by condensation of-naphthylamine, an aromatic aldehyde, and ammonia and subsequent dehydrogenation of the initially formed dihydro derivatives.See [1] for communication LIV.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 100–104, January, 1978.     

Synthesis and Properties of Hydroxyl-Containing Ionic Liquids

Hydroxyl-containing ionic liquids were synthesized by quaternization of 1,2-dimethyl-1H-imidazole, N-methylpyrrolidine, and pyridine with 2-chloroethanol or 6-chlorohexan-1-ol, followed by exchange of chloride ion for bis(trifluoromethanesulfonyl)azanide, and their properties were studied.