Центральная Научная Библиотека УрО РАН

Вид документа : Статья из журнала
Шифр издания : 54/N 64
Автор(ы) : Nikitin E. D., Popov A. M., Bogatishcheva N. S.
Заглавие : Vapor-Liquid Critical Properties of n-Alkylbenzenes from Toluene to 1-Phenyltridecane
Место публикации : Journal of Chemical & Engineering Data. - 2002. - Vol. 47, № 4. - С. 1012-1016
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: This paper gives experimental critical temperatures and pressures of 10 n-alkylbenzenes C6H5CnH2n+1 with the number of carbons in the side chain n = 1, 2, 4, 5, 6, 7, 8, 10, 11, and 13. n-Alkylbenzenes that are heavier than butylbenzene are thermally unstable at their critical points. The method of pulse heating of a wire probe placed into the liquid under study has been used. Residence times are from (0.01 to 1) ms. Equations for the correlation of the critical temperatures and pressures of n-alkylbenzenes with the number of carbon atoms in the side chain, molar mass, and normal boiling point have been obtained. The experimental critical constants of alkylbenzenes have been compared with the values calculated by the methods of Lydersen, Joback and Reid, and Constantinou and Gani
\\\\Expert2\\nbo\\Journal of Chemical and Engineering Data\\2002, v.47, p.1012.pdf
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Вид документа : Статья из журнала
Шифр издания : 54/S 73
Автор(ы) : Sosnovskikh V. Ya., Moshkin V. S., Kodess M. I.
Заглавие : Reactions of 3-cyanochromones with primary amines: structures of the products [Electronic resource]
Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2010. - Vol. 59, № 3. - С. 615-625
Систем. требования: http://www.springerlink.com/content/p3l352x757248565/fulltext.pdf
Примечания : 27.10.2011 г.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Reactions of 3-cyanochromones with primary aromatic amines in boiling benzene gave mixtures of Z- and E-3-arylamino-2-(2-hydroxyaroyl)acrylonitriles and 2-amino-3-(aryl-iminomethyl)chromones. The latter can easily be obtained in the individual state when the reaction is carried out in the presence of triethylamine. In the case of primary aliphatic amines, the open-chain reaction product immediately undergoes cyclization into 3-alkyliminomethyl-2-aminochromones. The structures of the products were examined by 1D and 2D 1H, 13C, and 15N NMR spectroscopy in DMSO-d6 and CDCl3
\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2009, 59 (3), 615-625.pdf
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Вид документа : Статья из журнала
Шифр издания : 54/G 65
Автор(ы) : Goryaeva M. V., Burgart Ya. V., Saloutin V. I.
Заглавие : Synthesis of pyrimido[1,2-alfa]benzimidazoles from ethyl 2-ethoxymethylidene-3-oxo-3-(polyfluoroalkyl)propionates [Electronic resource]
Место публикации : Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii). - 2010. - Vol. 46, № 3. - С. 432-438: рис., табл.
Систем. требования: http://www.springerlink.com/content/92054610666232j2/fulltext.pdf
Примечания : Bibliogr. : p. 438 (22 ref.). - 1.11.2011 г.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Cyclization of ethyl 2-ethoxymethylidene-3-oxo-3-polyfluoroalkylpropionates with benzimidazol-2-amine in boiling 1,4-dioxane followed two concurrent pathways with participation of fluoroacyl and ethoxycarbonyl fragments and formation of, respectively, ethyl 4-hydroxy-4-polyfluoroalkyl-1,4-dihydropyrimido-[1,2-alfa]benzimidazole-3-carboxylates and 3-polyfluoroacylpyrimido[1,2-alfa]benzimidazol-4-ols. Dihydropyrimido[1,2-alfabenzimidazole derivatives undergo dehydration to give ethyl 4-(polyfluoroalkyl)pyrimido[1,2-alfa]benzimidazole-3-carboxylates, whereas the hydroxy group in 3-polyfluoroacylpyrimido[1,2-a]benzimidazol-4-ols is capable of being replaced by the amino group of the second benzimidazole molecule with formation of 4-(1H-benzimidazol-2-ylamino)-3-polyfluoroacylpyrimido[1,2-alfa]benzimidazoles.
\\\\Expert2\\nbo\\Russian Journal of Organic Chemistry\\2010, 46 (3), 432-438.pdf
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Вид документа : Статья из журнала
Шифр издания : 54/P 99
Автор(ы) : Andreikov E., Amosova I. S., Dikovinkina Yu. A., Pervova M. G.
Заглавие : Pyrolysis of polyolefins in high-boiling solvents
Место публикации : Solid Fuel Chemistry. - 2013. - Vol.47, №4. - С. 209-219
Примечания : Bibliogr. : p. 218-219 (47 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): aliphatic hydrocarbons--coal tar pitch--high-boiling solvents
Аннотация: The pyrolysis of polyethylene and polypropylene in vacuum residue and coal-tar pitch solvents was studied in a batch reactor at atmospheric pressure in a temperature range of 380-420 °C. Aliphatic hydrocarbons and C 5-C32 normal olefins and isoolefins were the main pyrolysis products of the polyolefins and vacuum residue, which also underwent thermal degradation at these temperatures. The total conversion of a polypropylene-vacuum residue mixture into gaseous and distillate products was nearly additive; upon the pyrolysis of polypropylene in pitch and of polyethylene in vacuum residue and pitch, the yield of distillate products decreased and the paraffin/olefin ratio in these products increased. The observed regularities were explained by hydrogen transfer from the solvents to the intermediate radical products of the thermal decomposition of polymer chains. The reactions of the resulting of olefins with the solvents can also occur to a lesser degree. The greatest deviations from additivity were observed in the pyrolysis of polyethylene in the solvents used
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pestov A., Privar Y., Slobodyuk A., Bratskaya S., Boroda A.
Заглавие : Chitosan cross-linking with acetaldehyde acetals
Место публикации : Biomimetics. - 2022. - Vol. 7, № 1. - Ст.10
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): chitosan--acetaldehyde acetals--hydrogel
Аннотация: Here we demonstrate the possibility of using acyclic diethylacetal of acetaldehyde (ADA) with low cytotoxicity for the fabrication of hydrogels via Schiff bases formation between chitosan and acetaldehyde generated in situ from acetals in chitosan acetate solution. This approach is more convenient than a direct reaction between chitosan and acetaldehyde due to the better commercial availability and higher boiling point of the acetals. Rheological data confirmed the formation of intermolecular bonds in chitosan solution after the addition of acetaldehyde diethyl acetal at an equimolar NH2: acetal ratio. The chemical structure of the reaction products was determined using elemental analysis and 13C NMR and FT-IR spectroscopy. The formed chitosan-acetylimine underwent further irreversible redox transformations yielding a mechanically stable hydrogel insoluble in a broad pH range. The reported reaction is an example of when an inappropriate selection of acid type for chitosan dissolution prevents hydrogel formation.
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