共查询到20条相似文献,搜索用时 31 毫秒
1.
Abdelwareth A. O. Sarhan Mohammed S. Ibrahim Mostafa M. Kamal Kaiko Mitobe Taeko Izumi 《Monatshefte für Chemie / Chemical Monthly》2009,140(3):315-323
Abstract New ferrocenyl ketones were obtained as precursors of novel π-conjugated ferrocene-dithiafulvalene (Fc-DTF) and π-extended-ferrocenedithia-fulvalenes
(π-exFc-DTF) as electron-donor conducting materials from ferrocene by a direct aroylation process using the Friedel–Crafts
reaction. Novel Fc-DTF conjugates were synthesized using the Wittig–Horner reaction and their structures were determined.
The redox behavior of the ferrocenyl carbonyl compounds Fc-DTF and Fc-π-exDTF was investigated in comparison to the parent
ferrocene by means of cyclic voltammetry. A one-electron redox behavior was observed for carbonylferrocenes as one wave potential,
while a two-electron process was observed as two oxidation waves for the conjugates. Introduction of electron-withdrawing
groups led to increasing E
pa values and decreasing ΔE
p
values. The UV–Vis spectra of some compounds were studied in comparison with ferrocene. The absorption spectra showed a red-shift
with a slight increase in the absorption intensities.
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2.
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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3.
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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4.
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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5.
Barahman Movassagh Mohammad Soleiman-Beigi 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):409-411
Abstract A simple, highly efficient, and green protocol has been developed for preparation of sulfides from alkyl or aryl thiols and
benzyl-, allyl-, t-butyl, and adamantyl halides under solvent- and catalyst-free conditions.
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6.
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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7.
Abstract A classical convergent approach for the synthesis of the anticancer drug imatinib has been substantially improved. Imatinib
was assembled by coupling the amine and carboxylic acid precursors by using N,N′-carbonyldiimidazole (CDI) as a condensing agent. Both intermediates have been synthesized by novel efficient methods.
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8.
Mohammad A. Khalilzadeh Issa Yavari Zinatossadat Hossaini Hasan Sadeghifar 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):467-471
Abstract A novel method for oxazine ring formation is established using the reaction of ammonium thiocyanate and acid chlorides with
napthols in the presence of N-methylimidazole to afford [1,3]oxazine-4-thione derivatives in excellent yields.
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9.
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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10.
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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11.
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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12.
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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13.
Application of various ionic liquids as cosolvents for chloroperoxidase-catalysed biotransformations
Abstract Chloroperoxidase from Caldariomyces fumago catalyses oxidation of indole and thioanisole in reaction mixtures containing up to 40% (v/v) of different ionic liquids (ILs). Results indicate that ILs containing tosylate, trifluoroacetate, chloride, and methylsulfate
anions are suitable cosolvents for these transformations, yielding high enantiomeric excess and good conversion rates.
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14.
Carine Eng Jean-Mary Simone Akane Hartenbach François Loiseau Reinhard Neier 《Monatshefte für Chemie / Chemical Monthly》2009,41(3):349-354
Abstract The macrocyclisation of hydroxyethylfuranyl acetic acid and of dehydrogenated model compounds of nonactic acid was investigated
to develop a facile synthesis of nonactin analogues. By applying the Yamagushi macrocyclisation to our ω-hydroxyacids, we were able to isolate a mixture of di-, tri-, tetra- and pentameric macrocycles.
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15.
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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16.
Mohamed A. A. Radwan Marwa A. Shehab Siham M. El-Shenawy 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):445-450
Abstract 5-Aminobenzo[b]thiophene-2-carboxylic acid was converted to the corresponding 5-(2-chloroacetamido)benzo[b]thiophene-2-carboxylic acid by reaction with chloroacetyl chloride. This acetamido product was treated with different alkyl,
cycloalkyl, aryl, and heterocyclic amines to afford a series of C5-substituted benzo[b]thiophenes. These compounds were found to possess potent anti-inflammatory activity.
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17.
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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18.
Rahman Hosseinzadeh Mahmood Tajbakhsh Maryam Mohadjerani Zahra Lasemi 《Monatshefte für Chemie / Chemical Monthly》2009,140(1):57-60
Abstract Ethylenebis(N-methylimidazolium) ditribromide, a stable crystalline solid, is easily prepared by reaction of the corresponding dibromide
salt with bromine in n-hexane. 1,3-Diketones and β-ketoesters can be brominated chemoselectively to the corresponding α-monobrominated products
by using this reagent at 0–5 °C. Under the same reaction conditions, diethyl malonate, ethyl cyanoacetate, and malonitrile
were monobrominated at moderate yield.
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19.
Mohammad Anary-Abbasinejad Hossein Anaraki-Ardakani Fatemeh Ghanea 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):397-400
Abstract The reactive intermediate generated by the reaction of alkyl isocyanides and dialkyl acetylenedicarboxylates was trapped by
ethyl carbazones to produce stable ketenimine derivatives in good yield. The reaction is characterized by mild conditions,
high selectivity, and tolerance to various functional groups.
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20.
Svetlana Marković Sonja Stanković Slavko Radenković Ivan Gutman 《Monatshefte für Chemie / Chemical Monthly》2009,140(2):153-156
Abstract Two mechanisms for the isomerization of cyclopenta[fg]aceanthrylene to acefluoranthene were revealed. The first pathway occurs via a cyclobutyl intermediate, whereas the second
pathway involves a transition state that contains an sp
3-hybridized carbon atom. Both patterns show that the Stone-Wales rearrangement requires extremely high activation energy and
indicate that the isomerization process can occur only under a drastic temperature regime.
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