No abstract available

[en] This paper is that the first definitive evidence for hypervalent intermediate in the aminolysis of a sulfinate ester is presented by the concave downward curvature of the plot of k_obs vs amine concentration. Nucleophilic substitution reactions of sulfinic acid derivatives are similar to those of carboxylic acid derivatives. These reactions are well known to proceed through a concerted mechanism or a stepwise mechanism with a trigonal bipyramidal pentacoordinated intermediate(sulfurane) as shown in scheme 1. Sulfurane can be isolated if it is stabilized enough by certain structural factors, but it is very difficult to find out sulfurane in the simple nucleophilic substitution reactions of sulfur compounds. If the ¹⁸O isotope exchange or a break of pH rate profile are observed during the reactions, these could be taken as good piece of evidence for sulfurane intermediate. These observations were successful in the hydrolysis of sulfinate ester and sulfinamides. However, it is still to be clarified whether the simple nucleophlic substitution reactions at sulfur atom take place through a sulfurane. We report here the kinetic evidence for existence of an intermediate in the aminolysis of ethylbenzene sulfinate

[en] Sulfate flux from forest soils as a result of inputs from acidic deposition is thought to be a critical process in regulating acidification of surface waters. The purpose of this study was to evaluate biotic transformations of sulfur in an Adirondack Mountain forest soil by adding ³⁵S-sulfate to the forest floor. In September 1983 to each of two 0.5 m² plots, 2.22 x 10/sub 10/ dpm of ³⁵S-sulfate was added in 4 liters of solution. Analysis of soil horizons from the plot at the end of the six week incubation indicated that 70 and 99 percent of the added ³⁵S was retained in the soil at plots 1 and 2, respectively. More than 70 percent of the ³⁵S was found in Oa, Bh, and Bs1 horizons. In O horizons greater than 80 percent of the ³⁵S was found as organic sulfur, whereas in mineral horizons most was found as adsorbed sulfate. These findings indicated that a portion of the sulfate moving through the soil is both rapidly immobilized in the forest floor and adsorbed in the mineral horizons. On a net basis, however, the soil is not accumulating sulfur so that mineralization and desorption must equal immobilization and adsorption

[en] Sulfur as cement (modified sulfur cement) appears to lend itself very well to the purpose of storage of low- and medium-level radioactive waste. However the advantages of this still have to be discovered by the potential users. (author). 3 figs.; 1 tab

[en] The published data on the methods for the synthesis of vinyl sulfides are considered and generalised. The main attention is given to methods based on electrophilic sulfenylation of unsaturated compounds.

[en] Published data on thermolysis of organic compounds of divalent sulfur and on thermal synthesis involving these compounds are summarised. The bibliography includes 201 references.

[en] Electron paramagnetic resonance experiments were performed on [CH(SO₃)_y]_x samples in three doping levels, y=0.008, 0.09 and 0.20. Observed are single Dysonian signals with g=2.001 ± 0.001 and asymmetry increasing for the dopant concentration and the temperature(T) increase. The Curie-type paramagnetism is observed in the y=0.008 sample, and the Pauli in the y=0.09 and 0.20 samples. The EPR linewidths, whose typical values at room-temperature and 1 Atm. are 0.6 to 0.8 G, get broadened as T decreases. But, it becomes nearly constant below 170 K for the y=0.09 sample, and it even starts to decrease around 210 K for the y=0.20 sample. Also reported is the linewidth change due to the environmental gas pressure at the temperatures where the T-dependent linewidth decreases as T increases. The anomalous linewidth change by T as well as the sensitive change by the pressure is unique in the SO₃-doped (CH)_x among numerous (CH)_x derivatives. (Author)

[en] Full tex: Recently in order to protect organisms from the of radiation effect radio protectors have been applied principally concerning to sulfur compounds, aminothioles and indolilalkins. Although the achievements obtained in the direction of synthetic medicines discovery, they can not completely replace the medicinal preparation of natural origin. That is why the study of natural biological active substances with radio protector property are of special importance.One of the goals of the project is the detection of plant species rich with anti mutagen and radio protector, the study of their cultivation technology, and the produce of natural raw material with high quality in planting condition. Flora of Azerbaijan is considered one of the richest countries for its species' richness. There are plant varieties for producing radio protector substances (essence-oil, lipid, lipoid, phenol compounds, pigment substances, proteins, vitamins and various amino acids). We have cultivated new varieties and forms of sea buckthorn, black caraway, basil, tarragons which are richer with their radio protector substances among these plants. Our aim in producing new varieties and forms is to get new varieties which rich with protector property substances, by conducting selection in condition of the cultivation without touching the balance of natural biodiversity and to protect the species with few natural resources.In the article it is intended to prepare aerosol, consisted of essence oils and lipid mixtures, for respiratory system treatment in extreme conditions having radiation threat. The plants with essence oil are potential radio protectors.A technology will be worked out for the produce of cream, protecting surrounding tissues during radiation therapy; for producing radio protector propertied oils from these plant, fruits and seeds in order to treat radioactive burns of digestive system and skin; balsam producing for prophylactic purposes; hygienic remedies such as shampoo, soap and etc, in order to clean organism affected by radiation.Pure (100%) sea buckthorn oil, black caraway and basil have a strong radio protector feature. Producing these oils without determinant mixtures has been tested in laboratory conditions. On industry scale the researches will be conducted in the direction of this technology realization.There are also some achievements in the field of working out of production technology of food products, with polyvitamins, from plants for extreme conditions and it will be improved in the process of project activies.Scientific importance of alcoholic and less alcoholic drinks in liquidating the impact of radioactive substances in organism and their disposal out of the organism it is found in literatures. It is also intended to conduct research works on production technology of medicinal preparations, liquor, alcohol of vegetable origin, disinfectant lemonade, and tea varieties.It has been defined that the wheat content is rich with radio protector property proteins, free amino acids and their compounds, vitamins dissolved in water and oil, and pigment-rich substances. A high content of proteins, pigment materials the new wheat and triticale-rich oils and vitamin (wheat and rye hydride) varieties raised have been ascertained by us. As a result of the study of wheat proteins in the structure

[en] The investigations for selective adsorption of dibenzothiophene (DBT) over Ce/Ni-loaded Y zeolites with the emphasis on the effect of Ce as a cocation in the Ni-loaded Y zeolite are carried out in an attempt to produce more effective adsorbents for the desulfurization from transportation fuels. The promotional effects of Ce and coexisting toluene in the model fuel as well as contact time and adsorbent dose on the adsorptive performance were examined. The sulfur uptake strongly depends on the amount of Ce in the zeolite structure. The sorption data is varied according to both Langmuir and Freundlich isotherm models. The maximum sorption capacity by theoretically calculation is 22.2 mg/g at 25 deg. C. The Langmuir constants b = 5.82 mL/mg and the Freundlich constants K = 1.042 L/mg and 1/n = 0.4 are evaluated. Ni/Ce-loaded Y zeolites (NiCeY) and NiY, CeY, NaY zeolites were used as adsorbents for the removal of DBT from model fuel containing 500 mg/L sulfur with 5 vol% of toluene by a batch method under ambient conditions. NiCeY exhibits higher adsorptive selectivity for DBT than NiY and CeY, indicating that NiCeY is a more effective adsorbent to remove sulfur compounds from transportation fuels

[en] Published in summary form only