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1.
Anita Kovács I. Csóka Magdolna Kónya E. Csányi A. Fehér I. Erős 《Journal of Thermal Analysis and Calorimetry》2005,82(2):491-497
Summary The properties of the inner and the external aqueous phases, were studied in w/o/w multiple emulsions with light microscopic image analysis and differential scanning calorimetry (DSC). The importance of multiple
emulsions lies in the presence of these aqueous phases, making them available for sustained, controlled drug delivery systems.
Differentiation of these two aqueous phases, studying the effect of manufacturing technology on droplet structure, quantitative
determination of phase volumes and any changes occurring during storage are essential when planning w/o/w emulsions. The present study uses microscopic observations combined with DSC measurements in order to identify the formed
structure, at developmental stage in case of different components, preparation methods, and stirring rates. These tools are
beneficial during manufacturing as in process controls, or to ensure product quality. 相似文献
2.
G. A. Abakumov V. K. Cherkasov T. N. Kocherova N. O. Druzhkov Yu. A. Kurskii M. P. Bubnov G. K. Fukin L. G. Abakumova 《Russian Chemical Bulletin》2007,56(9):1849-1856
New sterically hindered functionalized o-quinones were synthesized by the 1,4-nucleophilic addition of secondary cyclic amines to 3,6-di(tert-butyl)-o-benzoquinone. The ability of these o-quinones to form o-semiquinone complexes with transition and main-group metals was studied by ESR spectroscopy in solution.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1786–1793, September, 2007. 相似文献
3.
A. V. Piskunov V. K. Cherkasov N. O. Druzhkov G. A. Abakumov V. N. Ikorskii 《Russian Chemical Bulletin》2005,54(7):1627-1631
ESR spectroscopy was used to study a series of mono- and binuclear o-semiquinone metal complexes, viz., derivatives of sterically hindered di-o-quinone 1,2-bis(2,5-di-tert-butylcyclohexadiene-1,5-dion-3,4-yl)ethane (1). Hindered rotation was found in the o-semiquinone moiety of the generated complexes. Magnetochemical measurements for polymeric bis(o-semiquinolate)copper(II) based on di-o-quinone 1 showed two antiferromagnetic channels of interaction between the paramagnetic centers.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1580–1584, July, 2005. 相似文献
4.
5.
A. V. Piskunov A. V. Lado G. A. Abakumov V. K. Cherkasov O. V. Kuznetsova G. K. Fukin E. V. Baranov 《Russian Chemical Bulletin》2007,56(1):97-103
Oxidation of amalgamated magnesium metal with 3,6-di-tert-butyl-o-benzoquinone (1) in different aprotic organic solvents afforded magnesium catecholate and bis-o-semiquinolate complexes. The catecholate derivatives of magnesium CatMgL2 (Cat is the 3,6-di-tert-butyl-o-benzoquinone dianion, L = THF or Py) were synthesized in high yields in pyridine and tetrahydrofuran, respectively. The reactions
in diethyl ether or dimethoxyethane produced hexacoordinated metal bis-o-semiquinolates SQ2MgLn (SQ is the 3,6-di-tert-butyl-o-benzoquinone radical anion, L = Et2O, n = 2; L = DME, n = 1). The reaction with the use of toluene as the solvent gave a magnesium bis-o-semiquinolate complex containing the coordinated unreduced o-quinone molecule. The molecular structures of the [CatMgPy2]2 and SQ2Mg·DME complexes were established by X-ray diffraction.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 92–98, January, 2007. 相似文献
6.
Condensation of o-tosylaminobenzaldehyde with γ-aminobutyric, 4-aminophenylthioacetic, and p-aminobenzoic acids and β-alanine gave 6,12-epimino-5,11-ditosyl-5,6,11,12-tetrahydrodibenzo[b, f]-1,5-diazocines with carboxyl-containing substituents at the bridging N atoms. The structures of three products were examined by X-ray diffraction analysis. Condensation of o-mesylaminobenzaldehyde (prepared by the McFadyen-Stevens reaction) with NH4OAc and primary amines afforded 6,12-epimino-5,11-dimesyl-5,6,11,12-tetrahydrodibenzo[b, f]-1,5-diazocine derivatives.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2165–2171, October, 2004. 相似文献
7.
I. V. Glukhov K. A. Lyssenko A. A. Korlyukov M. Yu. Antipin 《Russian Chemical Bulletin》2005,54(3):547-559
High-resolution single crystal X-ray study of 1-phenyl-o-carborane was carried out and the experimental and theoretical (B3LYP/6-311G** calculated) electron density distributions in the title compound were investigated. Character of electron delocalization in 1-phenyl-o-carborane was examined by analyzing the deformation electron density maps, maps of the Laplacian of the electron density, and maps of the electron localization function. Crystal-structure-forming X—H...H—X (X = C, B) intermolecular contacts were revealed and analyzed. The energies and geometric parameters of these contacts were compared with the results of quantum chemical calculations of the crystal structure and with characteristics of the same type of intramolecular contacts.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 541–552, March, 2005. 相似文献
8.
T. Kimura Y. Takahashi T. Kamiyama M. Fujisawa 《Journal of Thermal Analysis and Calorimetry》2007,88(2):587-595
Excess enthalpies (H
E)
of 17 binary mixtures of o- and m-isomers of dichlorobenzene, difluorobenzene, methoxymethylbenzene,
dimethylbenzene, dimethoxybenzene, aminofluorobenzene, fluoronitrobenzene,
diethylbenzene, chlorofluorobenzene, fluoroiodobenzene, bromofluorobenzene,
chloromethylbenzene, fluoromethylbenzene, bromomethylbenzene, iodomethylbenzene,
fluoromethoxybenzene, dibromobenzene at 298.15 K were measured. All excess
enthalpies measured were very small, and those of o-+m-isomers of aminofluorobenzene, dibromobenzene and
iodomethylbenzene were negative but 14 other binary mixtures of isomers were
positive over the whole range of mole fractions. H
E
of o-+m-isomers
of dimethoxybenzene showed the largest enthalpic instability and those of
aminofluorobenzene showed the largest enthalpic stability. There was a correlation
between dipole–dipole interaction, dipole–induced dipole interaction
or entropies of vaporization and excess partial molar enthalpies at infinite
dilution. 相似文献
9.
D. A. Rudakov V. L. Shirokii V. I. Potkin N. A. Maier V. I. Bragin P. V. Petrovskii I. B. Sivaev V. I. Bregadze A. V. Kisin 《Russian Chemical Bulletin》2005,54(7):1599-1602
Electrochemical thiocyanation of the dodecahydro-7,8-dicarba-nido-undecaborate and 7,8-dimethyldecahydro-7,8-dicarba-nido-undecaborate monoanions afforded thiocyanate derivatives of these compounds, which were isolated as alkylammonium salts.
The structures of the synthesized compounds were determined by the data from IR, 1H and 11B NMR, and 11B-11B NMR COSY spectroscopy.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1553–1556, July, 2005. 相似文献
10.
Palladium electrodeposition on poly-o-phenylenediamine (PPD) redox polymer was studied. Palladium electrodeposition was shown to be initiated at the ITO/polymer
interface with further proliferation into the polymeric matrix and passing by mediator mechanism. PPD exposure to PdCl2 solution was shown to result in the accumulation of palladium ions in the polymer matrix with partial substitution of counter
ions linked to nitrogen atom. Upon rinsing, the film retains some palladium ions, which can be reduced to metal.
Published in Russian in Elektrokhimiya, 2008, Vol. 44, No. 8, pp. 1035–1039.
The text was submitted by the authors in English. 相似文献
11.
G. A. Gazzaeva M. I. Khasanov S. S. Mochalov N. S. Zefirov 《Chemistry of Heterocyclic Compounds》2007,43(6):799-810
A new efficient method has been proposed for the synthesis of 4H-3,1-benzoxazines from 2-aminoacylbenzenes. This reaction
sequence may be used either for 2-aminoaryl alkyl ketones or 2-aminobenzophenones.
__________
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 941–954, June, 2007. 相似文献
12.
S. V. Timofeev V. I. Bregadze S. N. Osipov I. D. Titanyuk P. V. Petrovskii Z. A. Starikova I. V. Glukhov I. P. Beletskaya 《Russian Chemical Bulletin》2007,56(4):791-797
New alanine derivatives containing both the carboranyl and trifluoromethyl groups were synthesized by the reaction of organometallic
derivatives of o-carborane with methyl trifluoropyruvate imines. When using the 1R-(−)-menthoxycarbonyl protecting group at the nitrogen atom, one of diastereomers was isolated and characterized. Trifluoromethyl-carboranylalanine
methyl esters containing different protecting groups at the nitrogen atom were studied by X-ray diffraction. Both complete
and partial deprotection of the amino and carboxy groups was performed.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 761–767, April, 2007. 相似文献
13.
V. M. Dem’yanovich I. N. Shishkina Ya. A. Gritsyuk K. A. Potekhin A. V. Chesnova L. D. Ashkinadze 《Russian Journal of Organic Chemistry》2005,41(4):556-559
The condensation of lithiated (S)-N,N-dimethyl-1-phenylethylamine with o-methoxybenzophenones occurs in a nonstereoselective fashion due to possible coordination of lithium not only at the carbonyl group but also at the oxygen atom of the ortho-methoxy group.__________Translated from Zhurnal Organicheskoi Khimii, Vol. 41, No. 4, 2005, pp. 567–570.Original Russian Text Copyright © 2005 by Dem’yanovich, Shishkina, Gritsyuk, Potekhin, Chesnova, Ashkinadze. 相似文献
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15.
N. N. Sidamonidze R. O. Vardiashvili M. O. Isakadze E. I. Chachua 《Chemistry of Natural Compounds》2007,43(3):250-252
Addition of ethyl-, propyl-, and n-butylmercaptans to 1-O-allyl-2,3,4,6-tetra-O-acetyl-β-D-galactopyranose in the presence of benzoyl peroxide catalyst was studied for the first time. The products were 1-O-(3-ethylthiopropyl)-2,3,4,6-tetra-O-acetyl-β-D-galactopyranose, 1-O-(3-propylthiopropyl)-2,3,4,6-tetra-O-acetyl-β-D-galactopyranose, and 1-O-(3-butylthiopropyl)-2,3,4,6-tetra-O-acetyl-β-D-galactopyranose. Deacetylation of 1-O-(3-ethylthiopropyl)-2,3,4,6-tetra-O-acetyl-β-D-galactopyranose produced 1-O-(3-ethylthiopropyl)-β-D-galactopyranose.
__________
Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 209–211, May–June, 2007. 相似文献
16.
Reactions of barbituric, 1,3-dimethylbarbituric, and 2-thiobarbituric acids with 2-(1-pyrrolidinyl)benzaldehyde, its 6- and 7-membered homologs, and 4-phenylpiperazine and morpholine analogs lead to formation of fused systems with a spirocyclic 2,4,6-trioxopyrimidine fragment. The process involves intermediate formation of labile 5-arylmethylidenebarbituric acids which exhibit t-amino effect and undergo spontaneous isomerization to give the final products. The observed spirocyclizations are characterized by an anomalously high rate.__________Translated from Zhurnal Organicheskoi Khimii, Vol. 41, No. 6, 2005, pp. 920–925.Original Russian Text Copyright © 2005 by Krasnov, Kartsev. 相似文献
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18.
I. V. Kulakov 《Chemistry of Natural Compounds》2009,45(4):522-524
Condensation of the monosaccharides D-glucose and D-galactose with synthesized halo-substituted p-phenylenediamines and 4-amino-2,6-dibromophenol was studied. It was found that glycosylation occurred only at the 4-amino
group that was sterically unhindered by the halogen atom. The position of the aglycon in the glycoside was established by
PMR spectroscopy. 相似文献
19.
A. I. Nikitina G. N. Zhunusova S. A. Shoinbekova B. A. Mukhitdinova E. E. Ergozhin 《Russian Journal of Applied Chemistry》2004,77(10):1675-1678
Radical copolymerization of derivatives of monoethanolamine vinyl ether and o- and p-chloranil with acrylic acid was studied. The parameter p for this system was determined by the Shtraikhman analytical graphic method; the copolymerization constants, Alfrey-Price specific activity and polarity parameters, probabilities of formation of various unit sequences in the macromolecular chain, lengths of sequences of similar monomeric units, and Harwood block structure parameters were calculated.Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 10, 2004, pp. 1689–1692.Original Russian Text Copyright © 2004 by Nikitina, Zhunusova, Shoinbekova, Mukhitdinova, Ergozhin. 相似文献
20.
M. Domínguez-Pérez J. Jiménez de Llano L. Segade C. Franjo O. Cabeza 《Journal of Thermal Analysis and Calorimetry》2005,79(2):289-293
Summary This paper reports excess molar enthalpies of the binary systems hexane+ethyl benzene, hexane+o-xylene, hexane+m-xylene and hexane+p-xylene at 298.15 K and atmospheric pressure, over the whole composition range. The data was measured directly using a Calvet microcalorimeter. The excess magnitude was correlated to a Redlich-Kister type equation for each mixture. Also, we will discuss the results for the four mixtures studied here and by comparison with the same binary systems but containing propyl propanoate as first component. Finally, we will correlate our results with the Nitta-Chao and the three UNIFAC theoretical approximations. 相似文献