共查询到20条相似文献,搜索用时 109 毫秒
1.
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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2.
Abstract One-pot, three-components synthesis of 2,4,6-triarylpyridines and 5-unsubstituted-3,4-dihydropyrimidin-2(1H)-ones was performed under solvent-free conditions using molecular iodine as the catalyst in moderate to good product yields.
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3.
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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4.
Shahnaz Rostamizadeh Ali Mohammad Amani Reza Aryan Hamid Reza Ghaieni Leila Norouzi 《Monatshefte für Chemie / Chemical Monthly》2009,140(5):547-552
Abstract A simple and eco-friendly protocol for the synthesis of some novel substituted 2-arylbenzimidazoles was developed. In this
process, these compounds were prepared in water as the solvent using ZrOCl2·nH2O supported on montmorillonite K10 as an efficient water tolerating Lewis acid. The reaction was performed under mild conditions
with good to excellent yields and remarkable chemoselectivity in the absence of any byproduct.
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5.
Abolghasem Davoodnia Mehdi Bakavoli Mehdi Soleimany Niloofar Tavakoli-Hoseini 《Monatshefte für Chemie / Chemical Monthly》2009,47(3):355-358
Abstract A new route to the synthesis of 2-arylthieno[2,3-d]pyrimidin-4(3H)-ones has been developed through heterocyclization of 2-amino-4,5-dimethylthiophene-3-carboxamide
with aromatic aldehydes in boiling glacial acetic acid followed by air oxidation. The unoxidized intermediates, 2-aryl-2,3-dihydrothieno[2,3-d]pyrimidin-4(1H)-ones, are isolated when the reactions are carried out either at room temperature or under a nitrogen atmosphere.
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6.
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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7.
Wael A. El-Sayed Ibrahim F. Nassar Adel A.-H. Abdel-Rahman 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):365-370
Abstract New C-furyl glycosides bearing pyrazolines, isoxazolines, and dihydropyrimidine-2(1H)-thiones were synthesized in order to increase the number of tested compounds screened for antimicrobial activity. The antimicrobial
activity screening showed that the pyrazoline derivatives were the most active compounds.
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8.
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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9.
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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10.
Fangfang Dang Xinwei Wang Guoping Han Yahong Yao 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):615-617
Abstract A 3D metal-organic framework, [C6H3CdN2O4]·NH4, was synthesized solvothermally and structurally characterized by single-crystal X-ray structure determination. This compound
crystallizes in the tetragonal system with the space group P42/nmc. The crystal structure presents a 3D framework and open channels, exhibiting guest-coordination sites at channel walls and
strong fluorescent emission.
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11.
Svetlana Marković Zorica D. Petrović Vladimir Petrović 《Monatshefte für Chemie / Chemical Monthly》2009,140(2):171-175
Abstract The mechanism of the preactivation process of trans-dichlorobis(diethanolamine-N)palladium(II) complex is investigated using density functional theory. The role of diethanolamine (a solvent for the reaction
in the absence of a strong base) and acetonitrile (solvent for the reaction in the presence of a strong base) is analyzed
by using a discrete model. The Onsager model is applied to assess the effect of the bulk medium. Both models show that diethanolamine
activates the complex and thus is a better suited solvent for the Heck reactions of the investigated complex.
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12.
Emanuel Makrlík Ji?í Dybal Petr Vaňura 《Monatshefte für Chemie / Chemical Monthly》2009,286(1):1289-1292
Abstract From extraction experiments in the two-phase water–nitrobenzene system and γ-activity measurements, the stability constant
of protonated tetraethyl p-tert-butylcalix[4]arene tetraacetate in nitrobenzene saturated with water was determined. By using DFT calculations, the most
probable structure of the tetraethyl p-tert-butylcalix[4]arene tetraacetate·H3O+ complex species was derived.
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13.
Kamal Amani Mohammad Ali Zolfigol Arash Ghorbani-Choghamarani Maryam Hajjami 《Monatshefte für Chemie / Chemical Monthly》2009,140(1):65-68
Abstract A mild, efficient, and highly selective oxidation method of sulfides to sulfoxides using Fe(NO3)3·9H2O and catalytic amounts of KBr or NaBr in the presence of wet SiO2 (50% w/w) has been developed. A variety of aliphatic and aromatic sulfides were selectively oxidized at room temperature in good to
excellent yields.
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14.
Farough Nasiri Morteza Bidar Bahareh Atashkar 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):463-466
Abstract The reaction between dibenzoylacetylene and enol systems, such as acetylaceton or cyclohexane-1,3-dione in the presence of
triphenylphosphine in THF/H2O, leads to 4-acetyl-3-benzoyl-1-phenyl-1,5-hexanedione and 2-hydroxy-3-(2-oxo-2-phenylethyl)-2-phenyl-3,5,6,7-tetrahydro-1-benzofuran-4(2H)-one. Subsequently, these compounds undergo cyclization and elemination reactions in acidic dichloromethane at room temperature
to produce known highly functionalized furan derivatives.
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15.
Sara Tombelli Marco Mascini Barbara Scherm Gianni Battacone Quirico Migheli 《Monatshefte für Chemie / Chemical Monthly》2009,140(8):901-907
Abstract In this work, we report on the development of a DNA-based piezoelectric biosensor specific for the detection of an amplicon
of the aflD gene of Aspergillus flavus and A. parasiticus. Expression of this gene is consistently correlated with a strain’s ability to produce aflatoxins that are considered very
potent liver carcinogens in various animal species and humans. The DNA biosensor has been characterized with synthetic oligonucleotides
and amplicons. Moreover, it has been applied to the analysis of real samples consisting of amplicons of DNA extracted from
flours and feed contaminated with A. flavus and A. parasiticus.
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16.
Marco Rupprich Clemens Decristoforo Barbara Matuszczak 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):405-407
Abstract In contrast to the results presented in a previous report, the direct conversion of alcohols to alkyl fluorides with triphenylphosphine
and potassium fluoride in CCl4/DMF under mild conditions failed.
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17.
Emanuel Makrlík Petr Vaňura Jan Budka 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):583-585
Abstract The stability constant of the dibenzo-18-crown-6·H3O+ cationic complex species dissolved in nitrobenzene saturated with water has been determined from extraction experiments in
the two-phase water–nitrobenzene system and from γ-activity measurements. Various structures of protonated dibenzo-18-crown-6 are discussed.
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18.
Manas Chakrabarty Sulakshana Karmakar Ratna Mukherjee Shiho Arima Yoshihiro Harigaya 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):375-380
Abstract 1-Alkyl/phenyl-2-arylbenzimidazoles have been synthesized in very good to excellent yields by a one-pot condensation of N-alkyl/phenyl-o-phenylenediamines with aryl aldehydes in water at room temperature using cetylpyridinium bromide as a cheap and eco-friendly
catalyst.
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19.
Nagnnath D. Kokare Devanand B. Shinde 《Monatshefte für Chemie / Chemical Monthly》2009,140(2):185-188
Abstract Aromatic aldoximes were converted to the corresponding nitriles in good to excellent yields by employing phosphoric acid diethyl
ester 2-phenylbenzimidazol-1-yl ester as reagent. The method was equally effective for oximes bearing electron-donating and
electron-withdrawing substituents.
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20.
Sangtae Kim 《Monatshefte für Chemie / Chemical Monthly》2009,140(9):1053-1057
Abstract In this paper I summarize our recent investigations (Park and Kim, Phys Chem C 111:14903, 2007; Solid State Ionics 179:1329,
2008) on the origin of the grain-boundary resistance in a doped LaGaO3, a perovskite-structured solid electrolyte. The partial electronic and ionic resistances of the bulk and the grain boundaries,
as well as the total resistance, in 1 mol% Sr-doped LaGaO3 were measured separately by means of a dc-polarization method and ac-impedance spectroscopy. Both of the partial resistances
at the grain boundaries were greater than the bulk counterparts, indicating that the grain boundaries impede the ionic as
well as the electronic transport in this material. The transference number of the partial electronic conductivity at the grain
boundary was however greater than that in the bulk. This fact strongly suggests that both electronic and ionic charge carriers
deplete at the grain boundaries to form the space-charge zones and that the grain-boundary cores in this material are positively
charged. In light of the fact that the effective charge of the oxygen vacancy (+2) is greater than that of the electron hole
(+1), the oxygen vacancies deplete more sharply in the space-charge zones compared to the electron holes such that the grain
boundaries become more mixed conducting relative to the bulk. These observations verify that the electrical conduction across
the grain-boundaries in 1 mol% Sr-doped LaGaO3 is governed by the space charge.
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