共查询到20条相似文献,搜索用时 31 毫秒
1.
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.
Graphical abstract
相似文献
2.
Yohana M. Velasco-Santamaría Steffen S. Madsen Poul Bjerregaard Bodil Korsgaard 《Analytical and bioanalytical chemistry》2010,396(2):631-640
To evaluate the interaction between 17β-trenbolone (TB) and 17α-ethinylestradiol (EE2), male eelpout, Zoarces viviparus, was exposed for 21 days (April to May 2008) to 5 ng l−1 EE2 and 5 or 20 ng l−1 TB, separately or in combination in a flow-through SW system. The effects on hepatosomatic (HSI) and gonadosomatic index
(GSI), plasma vitellogenin (Vtg) concentration, gonadal histology, hepatic and testicular Vtg mRNA and estrogen receptor (ERα)
mRNA expression were investigated. No effects on HSI were observed. A significant decrease was observed in the GSI of all
males exposed to EE2 (<0.7%) when compared to controls (1.4%). Histological alterations and immature stages were observed
in the testis of all exposed males; however, males exposed to EE2 were the most affected. Increased tubule number and proportionally
decreased tubule diameter were observed in the testis of all EE2 groups. No effects in Vtg mRNA expression were observed in
the testis; however, a significant decrease in testis ERα mRNA was observed in males exposed to 20 ng l−1 TB. The groups exposed to EE2 showed a significant increase in plasma Vtg (>300-fold), hepatic Vtg mRNA (>450-fold), and
ERα mRNA (>100-fold) when compared to controls. This study shows that lower concentrations of 17β-trenbolone are unable to
counteract the EE2 estrogenic effects when the exposure is simultaneous.
相似文献
3.
Moslem Mansour Lakouraj Masoud Mokhtary 《Monatshefte für Chemie / Chemical Monthly》2009,140(1):53-56
Abstract A Mild and efficient method for preparing amides by reaction of nitriles with benzhydrol and tertiary alcohols is described
using polyvinylpolypyrrolidone-supported boron trifluoride. Selective amidation of benzhydrol in the presence of primary benzyl
alcohols was also achieved.
Graphical abstract
相似文献
4.
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.
Graphical abstract
相似文献
5.
Mohamed A. A. Radwan Eman M. H. Abbas 《Monatshefte für Chemie / Chemical Monthly》2009,140(2):229-233
Abstract Condensation of 2-acetylpyrrole with 5-methylfuran-2-carboxyaldehyde and 4-chlorobenzaldehyde in 20% NaOH give the corresponding
2-chalconylpyrroles. Some new 2-alkoxy-3-cyano-4,6-diarylpyridines were synthesized by condensation of chalcones with malononitrile,
followed by cyclization in sodium alkoxide. The reactivity of chalcones towards nitrogen nucleophiles such as thiourea and
hydroxylamine hydrochloride to provide thiopyrimidines and isoxazolines was investigated.
Graphical Abstract
相似文献
6.
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.
Graphical abstract
相似文献
7.
Nipawan Pongprom Gerhard Müller Peter Schmidt Wolfgang Holzer Helmut Spreitzer 《Monatshefte für Chemie / Chemical Monthly》2009,140(3):309-313
Abstract A series of carbinols has been synthesized by attachment of different piperidinyl side chains to the quinone structure of
azanaphthoquinone annelated pyrroles. The synthesized compounds were screened for their cytotoxic activities. Compared to
previously published results, they exhibited only moderate activities, thus showing that the existence of the quinone moiety
seems to be essential for anticancer activities of this group.
Graphical abstract
相似文献
8.
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.
Graphical abstract
相似文献
9.
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.
Graphical Abstract
相似文献
10.
Robabeh Baharfar Seyed M. Vahdat Fatemeh G. Hakimabadi 《Monatshefte für Chemie / Chemical Monthly》2009,140(5):489-493
Abstract An efficient one-pot reaction of dialkyl acetylenedicarboxylates with 2,4-dihydroxybenzo(or aceto)phenones in the presence
of triphenylphosphine produces 5-hydroxy- and 7-hydroxycoumarin derivatives. The novel procedure features short reaction time,
fairly good yields, and simple workup.
Graphical abstract
相似文献
11.
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.
Graphical abstract
相似文献
12.
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.
Graphical abstract
相似文献
13.
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
相似文献
14.
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.
Graphical abstract
相似文献
15.
Farahnaz K. Behbahani Majid M. Heravi Hossien A. Oskooie 《Monatshefte für Chemie / Chemical Monthly》2009,102(2):181-184
Abstract A mild and efficient method was developed for selective benzylation and methylation of hydroxyl compounds in the presence
of a catalytic amount of ferric perchlorate. We showed that ferric perchlorate was very effective in selectively promoting
the benzylation and methylation of primary aliphatic and benzylic alcohols versus secondary aliphatic alcohols and phenolic
hydroxy groups.
Graphical abstract
相似文献
16.
Issa Yavari S. Zahra Sayyed-Alangi Rahimeh Hajinasiri Hadi Sajjadi-Ghotbabadi 《Monatshefte für Chemie / Chemical Monthly》2009,140(2):209-211
Abstract A simple one-pot synthesis of functionalized ethyl 1,3-thiazole-5-carboxylates from the reaction of 2-chloro-1,3-dicarbonyl
compounds with thioureas or thioamides in the presence of 1-butyl-3-methylimidazolium trifluoromethanesulfonate is described.
Graphical abstract
相似文献
17.
Heinrich Berger Werner Seebacher Marcel Kaiser Reto Brun Robert Saf Robert Weis 《Monatshefte für Chemie / Chemical Monthly》2009,140(5):495-502
Abstract Several 4-amino-6,7-diarylbicyclo[2.2.2]octan-2-ols bearing varying substituents on the aromatic rings were synthesized following
a manual method for applying the Hansch approach. All new compounds were tested for their activity against the causative organisms
of East African sleeping sickness and malaria tropica. Structure activity relationships are discussed.
Graphical abstract
相似文献
18.
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.
Graphical abstract
相似文献
19.
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.
Graphical abstract
相似文献
20.
Farhad Shirini Mohammad Ali Zolfigol Masoumeh Abedini 《Monatshefte für Chemie / Chemical Monthly》2009,140(1):61-64
Abstract Saccharin sulfonic acid was easily prepared by the reaction of saccharin with neat chlorosulfonic acid at room temperature.
This reagent is efficiently able to catalyze the chemoselective trimethylsilylation of alcohols with hexamethyldisilazane
in the presence of amines and thiols.
Graphical abstract
相似文献