Synthesis of 1-substituted dihydropyrimidinone and quinazolinone derivatives

Condensation of N-substituted -alanines (synthesized from anthranilic acid or its esters and acrylic acid) with urea afforded the corresponding 1-substituted dihydropyrimidinedione and quinazolinedione. When potassium thiocyanate was employed in the reaction instead of urea, decarboxylation and desulfuration occurred.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1391–1394, October, 1992.     

Investigation of adsorption purification of the effluences containing heavy metal ions

Kinetics of adsorption purification of effluences containing heavy metal ions and adsorption of the metal ions under dynamic conditions using various adsorbents, including the products from industrial wastes are studied.     

Hydroxylation of the surface of calcium sulfates in aqueous media and processes of their solidification

Mechanisms of hydroxylation of the surface of calcium sulfates and their formulations in aqueous media and processes of their solidification are considered.     

3, 6-endoxocyclohexanes and -cyclohexenes. XXV. Some reactions of dimethyl 4,5-(1-benzyl-1, 2, 3-triazoline)-3, 6-endoxohexahydrophthalate

The anhydride and dimethyl ester of 4, 5-(1-benzyl-1, 2, 3-triazoline)-3, 6-endohexahydrophthalic acid, having a triazoline ring with an exo-cis configuration, are synthesized by reaction of benzyl azide with the furan-maleic anhydride adduct. Opening of the triazoline ring under the action of hydrochloric and acetic acids takes place with the separation of nitrogen and formation of the chloro and acetoxy derivatives, respectively, unaccompanied by a Wagner-Meerwein type of rearrangement.Part XXIV, see [1].     

5-Substituted pyrimidine derivatives

The properties and reactivities of 4-hydroxy- and 2,4-dihydroxy-5-(β-hydroxyethyl)pyrimidines and of the products of their transformations have been studied. 4-Chloro- and 2,4-dichloro-5-(β-chloroethyl)pyrimidines have been obtained. A number of 4-alkyl(aryl)amino-5-(β-chloroethyl)pyrimidines have been synthesized, and they have been converted into derivatives of 5,6-dihydropyrrolo[2,3-d]pyrimidine.     

Effect of the size of the aliphatic chain on the NMR spectra and the electrical conductivity of melts of alkali metal alkanoates in alkanoic acids

The dependence of NMR spectra of ⁷Li, ²³Na, ¹³³Cs and of the conductivity of melts of lithium, sodium, and cesium alkanoates in melts of alkanoic acids on the length of the aliphatic chain of the anion has been studied. As the anion size increases, chemical shifts of ²³Na and ¹³³Cs nuclei toward weak fields and ⁷Li nuclei toward strong fields are observed. The nature of the chemical shifts of alkali metal nuclei and of the electricity transport characteristic in the studied systems is discussed in connection with the nature of cation-anion interactions and the size and degree of free rotation of the anion.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 29, No. 1, pp. 81–87, January–February, 1993.     

Mechanism of adsorption,electroreduction and hydrogenation of compounds with ethylenic bonds on platinum and rhodium: Part II. Comparison of the electroreduction and catalytic hydrogenation processes

The catalytic liquid-phase hydrogenation of maleic acid on platinum and rhodium has been investigated. It is shown that the rate-determining step of this process as well as of the electroreduction process of maleic acid is the interaction of the chemisorbed particle of maleic acid with the adsorbed hydrogen which is formed at the preceding rapid stage of either the dissociative adsorption of molecular hydrogen, or the electrochemical stage of hydrogen ion discharge. The rate of the process with the same degree of surface coverage with hydrogen and chemisorbed particles of maleic acid does not depend on whether the process is carried out catalytically or electrochemically, on whether maleic acid and hydrogen were preliminarily adsorbed on the surface of the electrode-catalyst or not. With due regard for the mutual influence of chemisorbed particles participating in the rate-determining stage, the main kinetic equations for the electroreduction and catalytic hydrogenation processes have been derived. The difference in the rates of electroreduction of maleic acid on platinum and rhodium, with the same degree of electrode surface coverage with reactants, is shown to be the result of differences in the adsorption heats (or bonding strength with the surface) of hydrogen and maleic acid on these two metals. Experimental procedures are described in Part I [1].     

Use of enyne compounds in the synthesis of insect pheromones

A new approach has been developed to the synthesis of monogenic insect pheromones with acetogenin and macrolide structures, using the low reactivity of ozone and of 9-borabicyclo[3.3.1]nonane towards an acetylenic function as compared with a vinyl function.Institute of Organic Chemistry, Ufa Scientific Center of the Russian Academy of Sciences. Translated from Khimiya Prirodnykh Soedinenii, Vol. 33, No. 1, pp. 34–41, January–February, 1997.     

Nuclear magnetic isoscreening lines for O-O and O-H bonds: The second-order magnetic parameters of the H2O2 molecule

A variational method has been used with a basis of Gaussian atomic orbitals and an additive scheme based on localized molecular fragments to calculate the molar magnetic susceptibility and nuclear magnetic isoscreening line diagrams for O-O and O-H bonds, as well as and (for the protons) in the H₂O₂ molecule for the cis, trans, and twisted configurations. The molecular wave functions have been calculated by the INDO method and localized ones by the Edmiston-Rudenberg method, together with ab initio ₀ localized by Boys' method. It is found that and are substantially dependent on the bond lengths.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 22, No. 4, pp. 482–487, July–August, 1986.     

Grain Boundary Wetting in Polycrystals: 1. Probability of Wetting of Structural Elements

A model describing the wetting of structural elements in polycrystals such as grain boundaries (faces), triple lines (edges), and quaternary nodes (vertices) is proposed. It is assumed that the only driving force during wetting is the tendency of a system to the energy minimization due to the substitution of low-energy liquid–solid interfaces for high-energy grain boundaries. In this case, the anisotropy of grain boundary energy caused by the differences in misorientation of adjacent grains is taken into account, whereas the liquid–solid interface energy is assumed to be independent of the orientation. The well-known condition of grain boundary wetting (the Gibbs–Smith condition) is extended to the triple lines and quaternary nodes by introducing parameters determined as characteristic free energy of these elements.