Organoboron compounds. 374. Cyclic compounds of the chelate type from 2-pyridyl-and 2-pyrimidinylaminoboranes and dicyclohexylcarbodiimide

Conclusions New chelate compounds of boron, in which the chelating agents are, respectively, N.N-dicyclohexyl-N'-(2-pyridyl)guanidine and N,N-dicyclohexyl-N'-(2-pyrimidinyl)guanidine, have been synthesized by adding 2-pyridylaminodiorganylboranes and 2-pyrimidinylaminodiorganylboranes to dicyclohexylcarbodiimide.For the preceding report see [1].Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 659–663, March, 1980.     

2-Pyrimidinylaminodialkylboranes

Conclusions 2-Pyrimidinylaminodialkylboranes were obtained from 2-aminopyrimidine and trialkylboranes, which in their high reactivity resemble the 2-pyridylaminoalkylboranes.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 246–248, January, 1977.     

The synthesis of N-trialkylborazines from alkylamineboranes in the presence of mercaptans

Summary We have suggested a simple method for preparing N-trialkylborazines from alkylamine-boranes in the presence of small amounts of mercaptans.which play the role of catalysts for the reaction.     

Fermion Interactions,Cosmological Constant and Space-Time Dimensionality in a Unified Approach Based on Affine Geometry

One of the main features of unified models, based on affine geometries, is that all possible interactions and fields naturally arise under the same standard. Here, we consider, from the effective Lagrangian of the theory, the torsion induced 4-fermion interaction. In particular, how this interaction affects the cosmological term, supposing that a condensation occurs for quark fields during the quark-gluon/hadron phase transition in the early universe. We explicitly show that there is no parity-violating pseudo-scalar density, dual to the curvature tensor (Holst term) and the spinor-bilinear scalar density has no mixed couplings of A-V form. On the other hand, the space-time dimensionality cannot be constrained from multidimensional phenomenological models admitting torsion.     

Development of the Detonation Nanodiamond Synthesis from Tetryl Based Ternary Mixtures

Russian Journal of Applied Chemistry - The process of detonation synthesis of nanodiamonds from ternary systems was developed with conversion tetryl as their main component. The dependence of the...     

Synthesis of new pyrimido[4,5-d]pyrimidine derivatives from 5-acetyl-6-methyl-4-methylsulfanylpyrimidine-2(1H)-thiones and guanidine

Reactions of 5-acetyl-1-aryl(alkyl)-6-methyl-4-methylsulfanylpyrimidine-2(1H)-thiones (prepared from diacetylketene N,S-acetal) with guanidine afforded 3-alkyl- and 3-aryl-7-amino-5-methyl-4-methylidene-3,4-dihydropyrimido[4,5-d]pyrimidine-2(1H)-thiones. By-products of these reactions (5-acetyl-1-alkyl(aryl)-6-methyl-2-thiouracils) can also be obtained from the starting pyrimidinethiones and EtONa in EtOH. Pyrimidopyrimidinethiones can react with MeOH at the methylidene group in the presence of MeONa.     

Conversion of synthesis gas into alcohols on supported cobalt-molybdenum sulfide catalysts promoted with potassium

The use of transition metal sulfides as catalysts for the synthesis of alcohols can solve the problem of catalyst resistance to sulfur. Catalysts based on molybdenum sulfide of different compositions (promoted with Co and K) were synthesized with the use of various supports (aluminum oxide, aluminum oxide modified with silicon oxide, Sibunit, and titanium silicate) and tested in the reactions of alcohol synthesis and the hydrofining of a mixture of thiophene with n-1-hexene. The dependence of catalyst activity in the synthesis of alcohols on support pore size was demonstrated. It was found that an increase in the potassium content of the active phase of a catalyst increased its activity in the synthesis of alcohols and decreased it in hydrodesulfurization and hydrogenation reactions. Transmission electron microscopy data made it possible to quantitatively evaluate the effect of a potassium additive on the morphology of the active phase; the hypothesis that potassium was intercalated between the layers of molybdenum sulfide was proposed.