Oxidative Ammonolysis of Wood Bark

The influence of temperature (75-100°C), ammonia concentration in solution (1-5%), and oxygen pressure (1-8 MPa) on the yield of the target product (insoluble residue) and nitrogen content in this product in treatment of pine bark with oxygen in aqueous ammonia (oxidative ammonolysis) was studied. The resulting samples were tested in agriculture as nitrogen-containing fertilizers.     

Synthesis of condensed heterocyclic systems based on thioindoxyl

Substituted benzo[b]thieno[3,2-b]pyrylium salts and dibenzo[b,g]thieno[3,2-b; 2, 3-e]pyrylium salts, which are converted to the corresponding pyridines on refluxing with ammonium acetate in glacial acetic acid, were synthesized by acid condensation of 3-thioindoxyl with aldehydehydes of the aromatic and heteroaromatic series in the presence of perchloric acid.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1181–1185, September, 1976.     

Reactivity of benzoic acid esters towards cumylperoxy radicals

The alkoxy groups of aromatic carboxylic acid esters are attacked by cumylperoxy radicals. The rate constants for the abstraction of a hydrogen atom by cumylperoxy radicals are: for methyl benzoate k₂=(4.28±0.8)×10¹⁰ exp (–20.5±1.5/RT) and for ethyl benzoate k₂=(9.41±0.8)×10¹⁰ exp(–18.5±1.5/RT) l/mol sec. The strengths of the primary and the secondary C–H bonds of these compounds have been estimated.

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, . k₂=(4,28±0,8)·10¹⁰ exp (–20,5±1,5/RT) k₂=(9,41±0,8)·10¹⁰ exp (–18,5±1,5/RT) /·. C–H .

     

On the phenomenon of oscillatory decay of the <Superscript>125m</Superscript>Te isomer

The radioactive decay curve of the ^125mTe nucleus is measured in the environment of stable ¹²⁵Te nuclei representing a Mössbauer resonant screen. Thorough analysis shows that the decay of the ^125mTe nucleus corresponds to the standard exponential law with half-life T_1/2≈58 days without oscillations.     

The problem of gamma-laser and controlling ofMössbauer nuclei decay (theory and practice)

This paper discusses the control process of the radioactive Mössbauer nuclei spontaneous decay probability. The possibility of using this effect in order to produce an optimized gamma-laser is considered. For the first time, the experiment has shown radioactive lifetime doubling for ⁵⁷Fe nuclei and a general lifetime increase (including conversion and non-Mössbauer decay channels) by 2%.     

Stability of diazocarbonyl compounds under the conditions of gas chromatography and chromatography-mass spectrometry analysis

The gas chromatographic analysis of alkyldiazoacetates N₂CHCO₂R (R = CH₃ ? C₄H₉), ??-aliphatic diazoketones RCOCHN₂ (R = C₃H₇, C₅H₁₁, and C₉H₁₉), and aryl-substituted diazoketones Ph (CH₂) _n COCHN₂ (n = 0?C2) is shown to be possible when their retention temperatures are below the boiling points of compounds of this series at atmospheric pressure without decomposition (about 140°C). At higher temperatures occurs partial or complete decomposition of ??-diazoketones in chromatographic columns to form ketenes. Among the impurities in the reaction mixtures at the diazotization of corresponding alkyl glycinates were identified for the first time the nitrate esters of glycolic acid O₂NOCH₂CO₂R, as well as the dimeric products. All diazocarbonyl compounds and the impurities were characterized by mass spectra. For the first time their gas chromatographic retention indices were determined.