Effect of Treatment with Carbon Dioxide of the Zn Form of the TsVK Zeolite on Its Acid and Catalytic Properties in the Conversion of Methanol to Hydrocarbons

It is shown that it is possible to increase the yield of liquid hydrocarbons of the benzene fraction in the Mobil process by use of a catalyst modified by treatment with CO₂ of the Zn form of the TsVK zeolite. It is established that on treatment with CO₂ of the Zn-TzVK zeolite the concentration of strongly acidic -centers is increased. As a result of alkylation of C₂-C₄ olefins by methanol at these sites more of the high molecular C₅-C₈ aliphatic hydrocarbons are formed. Selectivity of conversion of methanol to liquid C₅-C₁₀ hydrocarbons of the benzene fraction is increased, but selectivity with respect to the light C₂-C₄ fractions is decreased.     

Hydrogen bonded clusters of alcohol molecules in inert solvents: a chain statistics approach

A theory is proposed for modeling the autoassociation of alcohol molecules either in the neat liquid or in inert (non-complexing) solvents. This autoassociation by hydrogen bonds takes the form of clusters which can be predominantly open or cyclized chains, depending on the concentration. Chain conformation statistics are used for calculating the dipole moment of each type of chain. Cyclization equilibrium theory is employed for obtaining formulae for the fraction of all types of clusters. The total Kirkwood angular correlation factorg is calculated in function of the concentration. For this only two parameters are used; the first one is a common equilibrium constant for H bond dissociation; the second one is closely linked to the stiffness of the chains. A numerical illustration is presented for the case of normal hexanol in various aliphatic solvents, for which several dielectric data exist in the literature.     

Mass-spectrometric study of the cyclization of diazo ketones. 2. Cyclization of 1-diazo-4-sulfonylaminobutan-2-ones to N-sulfonylpyrrolidin-3-ones

A comparison of the mass spectra of 1-diazo-4-sulfonylamino-butan-2-ones and N-sulfonylpyrrolidin-3-ones makes it possible to conclude that under the conditions of electron impact and chemical ionization the molecular ions of the investigated diazo ketones lose a molecule of nitrogen and undergo partial cyclization to the corresponding pyrrolidinones without undergoing the Wolff rearrangement.See [1] for Communication 1.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 919–925, July, 1982.     

Phenyl Migration into the β Position of an α-Acetylenic Group in a Pentavalent Phosphorus Compound

Russian Journal of General Chemistry -     

Photoinduced structure transformations in dichromate-impregnated denatured collagen

X-ray structure analysis shows that irradiating gelatin films containing chromates causes a spiral-coil transition in the denatured collagen molecules. The concentration and type of the chromate have substantial effects, as do the film preparation conditions. The x-ray diffraction and ESR data indicate that chromium(V) compounds formed by photoreduction from chromium(VI) ones are mainly responsible for the conformation transition. In the absence of chromium compounds, light absorbed by the gelatin macromolecules results in macroradicals on account of the photolysis in the denatured protein chains. There is no phase transition.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 24, No, 2, pp. 247–251, March–April 1988.