共查询到20条相似文献,搜索用时 37 毫秒
1.
Dmitry A. Sibgatulin Dmitry M. Volochnyuk Aleksander N. Kostyuk Sergey P. Ivonin Andriy V. Lapandin 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):639-643
Abstract The reaction of push–pull enamines with 1,2-biselectrophilic phenylglyoxal was investigated. Phenylglyoxal was found to react
depending on the structure of the push–pull enamine, affording either a hydroxyalkylation product at the methyl group or the
cyclic product via participation of the methyl group and the β-carbon of the enamine.
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2.
Kurt Kalcher Ivan Svancara Marijo Buzuk Karel Vytras Alain Walcarius 《Monatshefte für Chemie / Chemical Monthly》2009,140(8):861-889
Abstract An overview of the use of electrochemical sensors made from heterogeneous carbon materials (carbon paste electrodes, screen-printed
carbon electrodes) in the field of food analysis is presented. Sensors for inorganic and organic analytes as well as biosensors
are summarized.
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3.
Abstract UV–visible spectral observations indicate that the J-aggregation of protonated meso-tetra(4-sulfonatophenyl)porphyrin ([H2TSPP]2+) under acidic conditions is completely inhibited by the π–π counteraction between 1-butyl-pyridinium tetrafluoroborate ([bpy]BF4) and [H2TSPP]2+. The studies also suggest that the intermolecular π–π force is of relative importance for the J-aggregates of [H2TSPP]2+ and the intermolecular electrostatic force for the H-aggregates.
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4.
S. Makarem A. R. Fakhari Ali A. Mohammadi 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):645-649
Abstract Electrochemical oxidation of 2,3-dimethylhydroquinone has been studied in the presence of β-diketones as nucleophiles in aqueous
solution using cyclic voltammetry and controlled-potential coulometry. The results indicate that the derivatives of 2,3-dimethylhydroquinone
participate in a Michael addition reaction to form the corresponding benzofuran derivatives. The electrochemical synthesis
has been successfully performed at pH 7.0 and E = 0.1 V versus an Ag|AgCl|KCl (3 M) in an undivided cell in good yield and purity.
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5.
Raghunath B. Toche Bhausaheb K. Ghotekar Muddassar A. Kazi Madhukar N. Jachak 《Monatshefte für Chemie / Chemical Monthly》2009,140(2):235-241
Abstract A novel method for the synthesis of 3-(2-substituted ethyl)-2-methylbenzohetero[3,2-a]pyrimidines in high yield (80–85%) was achieved, which involves a dihydrofuranone intermediate, readily obtained from β-ketolactone
to 2-aminobenzoheterocycles. The major advantage of the methodology is the high yield and product purity.
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6.
Abstract Using ab-initio calculation, we have explored new chemical paths for the coalescence of C60 units into higher fullerenes and novel structures. Besides the Stone–Wales paradigm used for rationalizing the fusion of
fullerenes and nanotubes, we demonstrated that an alternative path exists for the fusion of two C60 units. This path uses successive “π–π” additions and subsequent bond reorganizations to lead to a specific C120 peanut-like structure. The energies of the chemical barriers, the intermediate structures, and the final product are markedly
lower than their counterparts found in the chemical paths based on Stone–Wales bond rotations. The results rationalize the
existence of a temperature range in which peanut-like structures are obtained during thermal treatment of peapod structures.
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Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
7.
Madhukar N. Jachak Sandeep M. Bagul Bhausaheb K. Ghotekar Raghunath B. Toche 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):655-662
Abstract A series of (2E)-3-(1-chloro-6-methoxy-3,4-dihydronaphthalen-2-yl)-1-(4-aryl)prop-2-en-1-ones (chalcones) have been synthesized by a new
synthetic route. The 3-pyridinecarbonitrile derivatives were synthesized by the Michael reaction of malononitrile (in base)
and aroylacetonitriles (in acid) with chalcones in one pot. The fluorescent properties and quantum yields of these compounds
were studied.
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8.
Ch. Sree Lakshmi H. Rehaman Adari Bhaskar Rao 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):611-613
Abstract The enzymatic cyclization of phenoxyacetylcyanomethylenetriphenylphosphorane derivatives using pre-treated baker’s yeast cells,
a rapid one-pot assembly of heteromacrocyclic compounds, is described.
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9.
Do-Min Lee Gullapalli Kumaraswamy Kee-In Lee 《Monatshefte für Chemie / Chemical Monthly》2009,140(1):73-78
Abstract Catalytic transfer hydrogenation of α-tosyloxyarylketones mediated by a chiral rhodium complex using an azeotropic mixture
of formic acid/triethylamine afforded the corresponding 1-arylethanediol monotosylates in excellent yield with high enantioselectivity.
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10.
Jolanta Pawłowska Krzysztof K. Krawczyk Krystyna Wojtasiewicz Jan K. Maurin Zbigniew Czarnocki 《Monatshefte für Chemie / Chemical Monthly》2009,140(1):83-86
Abstract (+)-Lortalamine was synthesised using (S)-(−)-α-methylbenzylamine as a chiral auxiliary. The stereochemistry of an intermediate compound was established on the basis
of X-ray crystallography, allowing unambiguous assignment of the absolute configuration.
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11.
Amin Rostami Sadegh Rahmati Ardeshir Khazaei 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):663-667
Abstract Molecular iodine generated in situ from Fe(NO3)3·9H2O/NaI acts as a highly efficient catalyst for tetrahydropyranylation of various alcohols and phenols with 3,4-dihydro-2H-pyran in almost quantitative yields. The reaction occurs rapidly in dichloromethane at room temperature, and use of toxic
molecular iodine is avoided.
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12.
Emanuel Makrlík Jiří Dybal Petr Vaňura 《Monatshefte für Chemie / Chemical Monthly》2009,140(3):251-254
Abstract From extraction experiments in the two-phase water–nitrobenzene system and γ-activity measurements, the stability constant
of the valinomycin–lithium complex in nitrobenzene saturated with water was determined. Further, the structure of the resulting
complex was indicated by means of the density functional level of theory (DFT) calculations.
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13.
Abstract A new diol-functionalized ionic liquid, 2,2-bis(1-(1-methylimidazolium)methylpropane-1,3-diol hexafluorophosphate, was synthesized
and applied as a facile, efficient, and recoverable “capture and release” reagent for aldehydes. This method has the advantages
of homogeneous reaction, heterogeneous separation, and recyclable uses.
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14.
Mohammad Rahimizadeh Mehdi Pordel Mehdi Bakavoli Zahra Bakhtiarpoor Ala Orafaie 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):633-638
Abstract New imidazo[4,5-a]acridone derivatives were synthesized from the rearrangement of 3H-imidazo[4′,5′:3,4]benzo[c]isoxazoles. New imidazo[4,5-a]acridines were obtained from the reaction of imidazo[4,5-a]acridones in boiling POCl3. All of these compounds exhibited antimicrobial activities comparable to streptomycin as reference drug.
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15.
Enrique Ruiz-Trejo José-Francisco Gómez-García 《Monatshefte für Chemie / Chemical Monthly》2009,140(9):1031-1039
Abstract In the search of new materials for solid oxide fuel cells, a study of the structure and electrical conductivity of Mg-doped
and nominally pure CeNb3O9-δ was undertaken. This material exhibits an orthorhombic crystal structure as determined by Rietveld refinement. Through a
combined study of 4-point DC and AC impedance spectroscopy, it was determined that the material presents oxygen ion conductivity,
electron conductivity and electron-hole conductivity according to the partial pressure of oxygen and temperature in agreement
with a simple defect chemistry model. Finally, some experiments seem to indicate the presence of proton conduction.
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16.
M. Dabiri Ali A. Mohammadi Hassan Qaraat 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):401-404
Abstract An efficient and direct procedure for the synthesis of novel spiro[isoindoline-1,2′-quinazoline]-3,4′(3′H)-dione derivatives is described. The process employs a condensation reaction of 2-aminobenzamides and isatins in the presence
of a catalytic amount of KAl(SO4)2.12H2O (alum) in ethanol under reflux.
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17.
Issa Yavari Rahimeh Hajinasiri S. Zahra Sayyed-Alangi 《Monatshefte für Chemie / Chemical Monthly》2009,140(2):205-207
Abstract 1-Ethyl-3-methylimidazolium bromide was used as a green recyclable alternative to volatile organic solvents for KOH catalyzed
three-component synthesis of diethyl alkylsulfanylmethylmalonates from aldehydes, diethyl malonate, and alkylthiols.
Graphical Abstract A synthesis of diethyl alkylsulfanylmethylmalonates catalyzed by KOH in an ionic liquid
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18.
Jian-Feng Zhou Gui-Xia Gong Kun-Bo Shi Yu-Lan Zhu 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):651-654
Abstract A facile procedure for the synthesis of quinoxalines is being reported starting from 3-(2-bromoacetyl)coumarins or 3-(2-bromobutanoyl)coumarins
and substituted o-phenylenediamines. The reactions were carried out under catalyst-free and microwave irradiation conditions producing the
title compounds in moderate to excellent yields in a short time with easy workup. The structures of all new compounds have
been confirmed on the basis of their IR, 1H NMR, 13C NMR, and HRMS data.
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19.
Zhi-zhong Wang Wei Jiao Guang-yun He Run-hua Lu 《Monatshefte für Chemie / Chemical Monthly》2009,140(1):79-81
Abstract A simple method for the straightforward regioselective synthesis of 2,3-mannoepoxy-β-cyclodextrin, which is a valuable precursor for further functionalization of β-cyclodextrin, is achieved under aqueous conditions without any organic solvents at a moderate yield.
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20.
A. López-Hernández K. Venkatesan H. W. Schmalle Heinz Berke 《Monatshefte für Chemie / Chemical Monthly》2009,140(7):845-857
Abstract Stable paramagnetic Cr(II) and Cr(III) bis(alkynyl) complexes of the type [trans(RC≡C)2Cr(dmpe)2]
n+ (R = Ph, SiMe3, SiEt3, C≡C–SiMe3
n = 0, 1) were prepared and characterised by NMR, cyclic voltammetry, EPR, magnetic measurements, and X-ray single-crystal
diffraction studies.
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