Showing papers in "Russian Chemical Bulletin in 1971"
TL;DR: In the case of weakly expressed electrostatic interactions, the adsorption on zeolites is closest in nature to adsorptions on microporous adsorbents, which do not contain active centers in the form of cations.
Abstract: 1.
Synthetic zeolites of various compositions and crystal chemical structures differ extremely substantially in average density in the adsorption space of the cations accessible for direct interaction with the molecules being adsorbed, and in their number for a unit mass of the adsorbent. This determines the limiting cases of adsorption with a weakly or strongly expressed role of the electrostatic component in the total adsorption interaction.
2.
The volume nature of the filling of the micropores of the zeolite and, in a satisfactory approximation, the temperature invariance of the characteristic equation of adsorption, are the experimental bases for the theory of the adsorption of gases and vapors on zeolites.
3.
In the case of weakly expressed electrostatic interactions, the adsorption on zeolites is closest in nature to adsorption on microporous adsorbents, which do not contain active centers in the form of cations in the adsorption space.
280 citations
48 citations
TL;DR: A study of the chemical properties, character of the thermal decomposition, and the IR spectra makes it possible to characterize magnesium borohydride as being a pure compound as discussed by the authors.
Abstract: 1
A study of the chemical properties, character of the thermal decomposition, and the IR spectra makes it possible to characterize magnesium borohydride as being a pure compound
2
Magnesium borohydride exists in two crystalline modifications:α-Mg(BH4)2 has a tetragonal lattice (a=1359, c=1651 A), whileβ-Mg(BH4)2 has a cubic face-centered lattice (a=155 A) The temperature of the polymorphic transition is 186° The density of theα-modification is 0989 g/cm3
3
Based on a combination of the studied properties and the degree of covalency, magnesium borohydride finds itself between lithium and beryllium borohydrides
48 citations
34 citations
TL;DR: In this article, the authors measured the energies of combustion of nitromethane and dinitromethyl radicals, and showed that decomposition of the C-H bond in nitro derivatives of methane can lead to temperatures of ∼103 kcal/mole.
Abstract: 1.
The heats of combustion of nitromethane and dinitromethane, 168.0±0.3 and 137.3±0.2 kcal /mole, respectively, were measured.
2.
The energies (kcal/mole) of dissociation of the C-N bond in nitro derivatives of methane were estimated on the basis of the available data: 60.3 in nitromethane, 53.8 in dinitromethane, 45.7 in trinitromethane, and 39.3 in tetranitromethane.
3.
The energies (kcal/mole) of formation of nitromethyl radicals\([^ \cdot CH_2 NO_2 31.6;^ \cdot CH(NO_2 )_2 37.5;\) and\(^ \cdot C(NO_2 )_3 49.8]\) were estimated, and lead to energies of dissociation of the C-H bond in nitro derivatives of methane ∼103 kcal/mole.
31 citations
18 citations
TL;DR: In this paper, the structure of the disproportionation products of the iminoxyls was established on the basis of the UV and IR spectra, based on the spectral properties of acids.
Abstract: 1.
The disproportionation products of iminoxyl radicals under the influence of acids were isolated.
2.
The structure of the disproportionation products of the iminoxyls was established on the basis of the UV and IR spectra.
17 citations
TL;DR: When aliphatic and aromatic aldazines are reacted with 5-pyrazolone derivatives, there occurs formal displacement of the azine group by the moiety of the 5 pyrazolones.
Abstract: When aliphatic and aromatic aldazines are reacted with 5-pyrazolone derivatives there occurs formal displacement of the azine group by the moiety of the 5-pyrazolone, as well as the addition of a second molecule of the 5-pyrazolone to the intermediately formed olefin with the formation of 4,4′-alkalidene(aralkalidene)-bis-(5-pyrazolones).
17 citations
TL;DR: The standard heats and free energies of formation of aluminum hydrides and borohydrides of the alkaline earth metals and aluminium hydride were evaluated by the method of comparative calculation as mentioned in this paper.
Abstract: 1.
The standard heats and free energies of formation of aluminum hydrides and borohydrides of the alkaline earth metals and aluminum hydride were evaluated by the method of comparative calculation.
2.
The heats and free energies of the decomposition of borohydrides and aluminum hydrides into the component hydrides were calculated.
3.
The heats and free energies of the decomposition of borohydrides and aluminum hydrides of the second group were calculated.
4.
In both types of decomposition, borohydrides are more stable than the corresponding aluminum hydrides.
16 citations
TL;DR: The most active of the catalysts studied are [4.7% Ni]/CaY, CaY-90, CAY-56, [4% Co]/NaY, and the most selective NdY-63 as mentioned in this paper.
Abstract: 1.
Synthetic type Y zeolites are active in the disproportionation of propylene, which is accompanied by a redistribution of hydrogen with the formation of saturated hydrocarbons and condensation products.
2.
The most active of the catalysts studied are [4.7% Ni]/CaY, CaY-90, CaY-56, [4% Ni]/NaY, and the most selective NdY-63, 4.7% Ni/CaY, [4% Co]/NaY, 4.7% Ni/DY.
3.
The selectivity of the catalysts with respect to disproportionation depends on their composition, method of preliminary treatment, and experimental conditions.
16 citations
TL;DR: In this paper, the Clausius-Clapeyron and Kirchhoff formulas are replaced with the variables in the thermodynamic functions for a cylinder filled with gas and closed with a piston, within which the sorbent is included.
Abstract: 1.
To obtain the basic functions of the thermodynamics of Sorption equilibrium there is no need to separate the entire sorbate into gas and sorption phases.
2.
The thermodynamics of sorption equilibrium can be represented as the result of replacement of the variables in the thermodynamic functions for a cylinder filled with gas and closed with a piston, within which the sorbent is included.
3.
The method of replacement of variables makes the relationship of functions of the type of Clausius-Clapeyron and Kirchhoff formulas, used in the thermodynamics of sorption, to the axioms of thermodynamics more graphic, and also permits a refinement of the thermodynamic meaning of these functions.
TL;DR: In this article, a method was developed for the determination of the solubility of ozone, based on spectrophoto-metric measurement of its concentration at the exit from the vessel with the solvent.
Abstract: 1.
A method was developed for the determination of the solubility of ozone, based on spectrophoto-metric measurement of its concentration at the exit from the vessel with the solvent.
2.
The solubility of ozone was measured at various concentrations and temperatures for a number of the compounds most frequently used in the investigation of reactions in which ozone participates.
TL;DR: In this paper, the decomposition of nitromethane in the presence of various inhibitors (NO, toluene, cis-2-butene), and at various ratios of the surface area and volume of the reaction vessel was investigated.
Abstract: 1.
A study was made of the decomposition of nitromethane in the presence of various inhibitors (NO, toluene, cis-2-butene), and at various ratios of the surface area and volume of the reaction vessel.
2.
The characteristics of the homogeneous monomolecular reaction were determined.
TL;DR: The steric structure of the investigated compounds was established as discussed by the authors, and the interaction of the substituents in the benzene ring of diethyl esters of benzoylphosphonic acids with the diethoxyphosphono group was detected.
Abstract: 1.
Diethyl esters of certain substituted benzoylphosphonic acids and diethyl(diphenyl)benzoylphosphine oxides were synthesized, and their dipole moments were determined.
2.
The steric structure of the investigated compounds was established.
3.
Interaction of the substituents in the benzene ring of diethyl esters of benzoylphosphonic acids with the diethoxyphosphono group was detected.
TL;DR: The anomalous variation of the solubility of the two hydrides can be explained by a change in the molecular state of the hydride: polymerization of lithium aluminum hyddride and dissociation of lithium borohydride etherates as mentioned in this paper.
Abstract: 1.
The solubility of lithium aluminum hydride in diethyl ether at the temperatures 0, 20, 25, and 30° is 21.3, 28.4, 28.3, and 26.5% LiAlH4, respectively. The solubility of lithium borohydride at the same temperatures is 1.32, 2.90, 4.80, and 13.4% LiBH4, respectively.
2.
The anomalous variation of the solubility of the two hydrides can be explained by a change in the molecular state of the hydrides: polymerization of lithium aluminum hydride and dissociation of lithium borohydride etherates.
TL;DR: In this article, a study was made of reaction in the system: triethyl phosphite-amide (amine)-paraform(benzaldehyde), which leads to the formation of the corresponding esters of aminomethyl(alkyl)phosphonic acids.
Abstract: A study was made of reaction in the system: triethyl phosphite-amide (amine)-paraform(benzaldehyde). The reaction leads to the formation of the corresponding esters of aminomethyl(alkyl)phosphonic acids.
TL;DR: In the series of complex hydrides, containing the anions BH 4 − and [Al(BH 4]− and the cation [R4N]+, the solubility in nonpolar solvents increases in a steady manner, while the melting point decreases, with increase in the length of the hydrocarbon chain R as mentioned in this paper.
Abstract: 1.
Tetrabutylammonium borohydride was obtained by the exchange reaction of tetrabutylammonium bromide with excess sodium borohydride in ether isopropyl alcohol or benzene medium.
2.
Tetrabutylammonium borohydride aluminate, [(C4H9)4N] [Al(BH4)4], was synthesized by the reaction of the tetrabutylammonium and aluminum borohydrides.
3.
In the series of complex hydrides, containing the anions BH 4 − and [Al(BH4)4]− and the cation [R4N]+, the solubility in nonpolar solvents increases in a steady manner, while the melting point decreases, with increase in the length of the hydrocarbon chain R.
TL;DR: The enthalpy of formation of the piperidyl radical (23.5±1.8 kcal/mole) was estimated in this paper, and its enthalpies of formation in the gas phase were calculated.
Abstract: 1.
The heats of combustion of N-nitropiperidine (789.6±0.4 kcal/mole) and N,N-dimethylnitramine (DMNA) (375.2±0.3 kcal/mole) were determined, and their standard enthalpies of formation were calculated, equal to −22.2±0.4 and −17.9±0.3 kcal/mole, respectively.
2.
The heat of evaporation of NP (11.6±0.2 kcal/mole) was determined and its enthalpy of formation in the gas phase (−10.6±0.5 kcal/mole) was calculated.
3.
The enthalpy of formation of the piperidyl radical (23.5±1.8 kcal/mole) was estimated.
TL;DR: In this paper, the IR spectra of a number of organothiophosphorus compounds were studied, and the vibration bands of P-S, P=S, and P=Se were identified.
Abstract: 1.
The IR spectra of a number of organothiophosphorus compounds were studied, and the vibration bands of P-S, P=S, and P=Se were identified.
2.
The frequency and integral intensity of the vibrations of the P-S bond are sensitive to a change in the surroundings of the phosphorus atom.
3.
In the compounds studied there are various rotational isomers; their energy difference was calculated.
TL;DR: In this paper, a study was made of the reaction of 6-methyluracil, uracil and 2-amino-4-hydroxy-6-methylpyrimidine with chloromethylphosphonic acid.
Abstract: A study was made of the reaction of 6-methyluracil, uracil, and 2-amino-4-hydroxy-6-methylpyrimidine with chloromethylphosphonic acid. The structures of some of the products that were formed here were established.
TL;DR: The stability constants of the complexes at room temperature were calculated according to the Benesi-Hildebrand method as discussed by the authors, and the ionization potentials of polyvinyl carbazole, vinylcarbazole and carbazoles were calculated using the Briegleb-Czekalle equation.
Abstract: 1
Polyvinylcarbazole, carbazole, and vinylcarbazole in chloroform solutions form complexes with charge transfer with monomer electron acceptors with a 1∶1 composition
2
The stability constants of the complexes at room temperature were calculated according to the Benesi-Hildebrand method
3
The ionization potentials of polyvinylcarbazole, vinylcarbazole, and carbazole were calculated according to the Briegleb-Czekalle equation
TL;DR: The product of chloromethylation of 2-acetothienone by paraform and HC1 in chloroform is actually an almost equimolar mixture of the 4- and 5-chloromethsyl derivatives.
Abstract: 1.
The chloromethylation of 2-acetothienone and 2-thiophene aldehyde by monochloromethyl ether in the presence of 2.2 M anhydrous aluminum chloride without a solvent is directed almost exclusively in the 4-position of the thiophene ring: the products of chloromethylation contain ~98 and 93% 4-chloromethyl derivatives, respectively.
2.
The product of chloromethylation of 2-acetothienone by paraform and HC1 in chloroform, described in the literature as 5-chloromethyl-2-acetothienone, is actually an almost equimolar mixture of the 4- and 5-chloromethyl derivatives.
3.
Samples of individual 4- and 5-chloromethyl-2-acetothienones were synthesized, and their NMR and IR spectra were studied.
TL;DR: In this paper, the synthesis of γ-Aminopropylphosphonic acid was described, which was obtained by the condensation of O,O-diethyl vinylphosphonate with nitromethane in the presence of sodium ethylate, and subsequent reduction.
Abstract: γ-Aminopropylphosphonic acid was synthesized by the hydrolysis of O,O-diethyl γ-aminopropylphosphonate, which was obtained by the condensation of O,O-diethyl vinylphosphonate with nitromethane in the presence of sodium ethylate, and subsequent reduction.
TL;DR: In this article, the authors experimentally determined the thermochemical characteristics of dimethylfuroxan and Dimethylfurazan: the combustion heats (−592.0 ± 0.2 and −594.6± 0.1.
Abstract: 1.
We experimentally determined the thermochemical characteristics of dimethylfuroxan and dimethylfurazan: the combustion heats (−592.0 ±0.2 and −594.6±0.9 kcal/M), standard enthalpies of formation (10.8 ±0.2 and 13.4±0.9 kcal/M), vaporization heats (13.6±0.2 and 12.2±0.2 kcal/M), and enthalpies of formation in the gas phase (24.4±0.4 and 25.6±1.1 kcal/M).
2.
On the basis of the experimental data the energy of the N→O bond was estimated to be 60.7±1.5 kcal/M.
TL;DR: In this paper, a study was made of the NMR spectra of the nitroxyl radicals of the isoindoline series and the σ -electron spin density falls mainly into the benzene rings of the radicals.
Abstract: 1.
A study was made of the NMR spectra of the nitroxyl radicals of the isoindoline series.
2.
The σ -electron spin density falls mainly into the benzene rings of the radicals.
TL;DR: The halogenation of 3-hydroxyquinoline, similar to aminomethylation, is directed to the 4 position of the quinoline ring as discussed by the authors.
Abstract: 1.
A study was made of the halogenation (chlorination, bromination, iodination) of 3-hydroxyquinoline.
2.
The halogenation of 3-hydroxyquinoline, similar to aminomethylation, is directed to the 4 position of the quinoline ring.
3.
Attempts to obtain the 2,4-bishalo compounds of 3-hydroxyquinoline proved unsuccessful.
TL;DR: The results obtained in studying the hydrogenating and dehydrogenating activity of catalysts make it possible to assume that a relation exists between the activity of the catalysts and their basicity as mentioned in this paper.
Abstract: The results obtained in studying the hydrogenating and dehydrogenating activity of catalysts make it possible to assume that a relation exists between the activity of the catalysts and their basicity.
TL;DR: Nickel zeolite catalysts, containing NiO on the surface of the Zeolite or Ni2+ ions in the cavities, are active in these reactions as discussed by the authors.
Abstract: 1.
Crystalline and amorphous nickelaluminosilicate catalysts, containing all the nickel in the form of the metal, are inactive in dimerization and other conversions of ethylene at 150–250°.
2.
Nickel zeolite catalysts, containing NiO on the surface of the zeolite or Ni2+ ions in the cavities, are active in these reactions.