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Molecules, Volume 11, Issue 5 (May 2006) – 10 articles , Pages 309-382

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Article
Synthesis of New 4(3H)-Quinazolinone Derivatives Using 5(4H)-Oxazolones
Molecules 2006, 11(5), 377-382; https://doi.org/10.3390/11050377 - 27 May 2006
Cited by 6 | Viewed by 5672
Abstract
New derivatives of 5(4H)-quinazolinone containing 2-imidazolin-5-one rings have been prepared from 5(4H)-oxazolone derivatives. Full article
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Article
Experimental and Theoretical Study of Lanthanide Complexes Based on Linear and Macrocyclic Polyaminopolycarboxylic Acids Containing Pyrazolylethyl Arms
Molecules 2006, 11(5), 345-356; https://doi.org/10.3390/11050345 - 17 May 2006
Cited by 7 | Viewed by 8019
Abstract
We report the synthesis of two novel Gd(III)-complexes derived from linear and macrocyclic polyaminopolycarboxylic acids 1 and 2, which contain a 3,5- dimethylpyrazolyl-ethyl arm, and a study of their relaxivity properties. The relationships between the experimental and theoretical results have provided interesting information [...] Read more.
We report the synthesis of two novel Gd(III)-complexes derived from linear and macrocyclic polyaminopolycarboxylic acids 1 and 2, which contain a 3,5- dimethylpyrazolyl-ethyl arm, and a study of their relaxivity properties. The relationships between the experimental and theoretical results have provided interesting information about the kinetic and thermodynamic stability of these complexes. Full article
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Communication
First Synthesis of 3-Acetyl-2-aminothiophenes Using the Gewald Reaction
Molecules 2006, 11(5), 371-376; https://doi.org/10.3390/11050371 - 16 May 2006
Cited by 31 | Viewed by 7295
Abstract
Novel 3-acetyl-2-aminothiophenes were prepared from cyanoacetone and1,4-dithianyl-2,5-diols using a modified Gewald reaction. The syntheses of thecorresponding acetamides, as well as that of 3-acetyl-2-amino-5-nitrothiophene – aninteresting building-block for thiophene azo dyes – are reported. Detailed spectroscopicinvestigations (1H-NMR, 13C-NMR, MS, IR) of [...] Read more.
Novel 3-acetyl-2-aminothiophenes were prepared from cyanoacetone and1,4-dithianyl-2,5-diols using a modified Gewald reaction. The syntheses of thecorresponding acetamides, as well as that of 3-acetyl-2-amino-5-nitrothiophene – aninteresting building-block for thiophene azo dyes – are reported. Detailed spectroscopicinvestigations (1H-NMR, 13C-NMR, MS, IR) of the obtained compounds are presented. Full article
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Correction
Molecules 2002, 7, 885-895
Molecules 2006, 11(5), 370; https://doi.org/10.3390/11050370 - 12 May 2006
Cited by 1 | Viewed by 2908
Communication
Selective Enzymatic Reduction of Aldehydes
Molecules 2006, 11(5), 365-369; https://doi.org/10.3390/11050365 - 12 May 2006
Cited by 10 | Viewed by 6640
Abstract
Highly selective enzymatic reductions of aldehydes to the corresponding alcohols was performed using an E. coli JM109 whole cell biocatalyst. A selective enzymatic method for the reduction of aldehydes could provide an eco-compatible alternative to chemical methods. The simplicity, fairly wide scope and [...] Read more.
Highly selective enzymatic reductions of aldehydes to the corresponding alcohols was performed using an E. coli JM109 whole cell biocatalyst. A selective enzymatic method for the reduction of aldehydes could provide an eco-compatible alternative to chemical methods. The simplicity, fairly wide scope and the very high observed chemoselectivity of this approach are its most unique features. Full article
Article
Synthesis of Novel Sterically Demanding Carbo- and Heterocyclic β-Ketoesters
Molecules 2006, 11(5), 357-364; https://doi.org/10.3390/11050357 - 10 May 2006
Viewed by 6994
Abstract
We present an easy method for the synthesis of β-ketoesters starting from variouscarbocyclic and heterocyclic carboxylic acids and esters. The β-ketoester side-chain wasintroduced by a sequence involving α-deprotonation and quenching with CO2, conversion tothe corresponding acid chloride and subsequent chain elongation [...] Read more.
We present an easy method for the synthesis of β-ketoesters starting from variouscarbocyclic and heterocyclic carboxylic acids and esters. The β-ketoester side-chain wasintroduced by a sequence involving α-deprotonation and quenching with CO2, conversion tothe corresponding acid chloride and subsequent chain elongation using deprotonated ethylacetate. Full article
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Article
An Improved NMR Study of Liposomes Using 1-Palmitoyl-2-oleoyl-sn-glycero-3-phospatidylcholine as Model
Molecules 2006, 11(5), 334-344; https://doi.org/10.3390/11050334 - 10 May 2006
Cited by 19 | Viewed by 10611
Abstract
In this paper we report a comparative characterization of Small UnilamellarVesicles (SUVs), Large Unilamellar Vesicles (LUVs) and Multilamellar Vesicles (MLVs)prepared from 1-palmitoyl-2-oleoyl-sn-glycero-3-phospatidylcholine (POPC), carried outusing two NMR techniques, namely High Resolution NMR in solution and HighResolution–Magic Angle Spinning (HR-MAS). The size and size [...] Read more.
In this paper we report a comparative characterization of Small UnilamellarVesicles (SUVs), Large Unilamellar Vesicles (LUVs) and Multilamellar Vesicles (MLVs)prepared from 1-palmitoyl-2-oleoyl-sn-glycero-3-phospatidylcholine (POPC), carried outusing two NMR techniques, namely High Resolution NMR in solution and HighResolution–Magic Angle Spinning (HR-MAS). The size and size distributions of thesevesicles were investigated using the dynamic light scattering technique. An improvedassignment of the 1H-NMR spectrum of MLVs is also reported. Full article
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Article
Synthesis and Antitumor Evaluation of Novel Derivatives of 6-Amino-2-phenylbenzothiazoles
Molecules 2006, 11(5), 325-333; https://doi.org/10.3390/11050325 - 09 May 2006
Cited by 40 | Viewed by 6357
Abstract
Novel derivatives of 6-amino-2-phenylbenzothiazole bearing differentsubstituents (amino, dimethylamino or fluoro) on the phenyl ring were prepared as thecorresponding hydrochloride salts. 6-Nitro-2-(substituted-phenyl)benzothiazoles (1-6) weresynthesized by condensation reactions of substituted benzaldehydes with 2-amino-5-nitrothiophenol. Nitro derivatives were reduced to the amino derivatives with SnCl2/HCl.Water [...] Read more.
Novel derivatives of 6-amino-2-phenylbenzothiazole bearing differentsubstituents (amino, dimethylamino or fluoro) on the phenyl ring were prepared as thecorresponding hydrochloride salts. 6-Nitro-2-(substituted-phenyl)benzothiazoles (1-6) weresynthesized by condensation reactions of substituted benzaldehydes with 2-amino-5-nitrothiophenol. Nitro derivatives were reduced to the amino derivatives with SnCl2/HCl.Water soluble hydrochloride salts of 6-amino-2-(substituted-phenyl)benzothiazole (13-19)were prepared using concentrated or gaseous HCl. Compounds 13-19 were found to exertcytostatic activities against malignant human cell lines: cervical (HeLa), breast (MCF-7),colon (CaCo-2), laryngeal carcinoma (Hep-2), and normal human fibroblast cell lines (WI-38). Full article
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Article
A Handy and Solventless Direct Route to Primary 3-[3-Aryl)-1,2,4-oxadiazol-5-yl]propionamides Using Microwave Irradiation
Molecules 2006, 11(5), 318-324; https://doi.org/10.3390/11050318 - 09 May 2006
Cited by 24 | Viewed by 5899
Abstract
A one-step, simple and straightforward synthesis of the title amides from the corresponding carboxylic acids, urea and imidazole under microwave irradiation is described. Full article
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Article
Solvent Effects in Electrocoagulation of Selected Plant Pigments and Tannin
Molecules 2006, 11(5), 309-317; https://doi.org/10.3390/11050309 - 29 Apr 2006
Cited by 6 | Viewed by 7600
Abstract
Electrocoagulation of a plant extract and certain substances representative of selected classes of plant pigments, viz. chlorophyll, a carotenoid, a phenolic substance and a tannin, was performed in ethanol containing varying amounts of water (15-75%). The results showed that the extent and efficiency [...] Read more.
Electrocoagulation of a plant extract and certain substances representative of selected classes of plant pigments, viz. chlorophyll, a carotenoid, a phenolic substance and a tannin, was performed in ethanol containing varying amounts of water (15-75%). The results showed that the extent and efficiency of coagulation of these substances tends to vary in a manner directly related to the water content of the solvent, although the tannin and the phenolic substance were less sensitive to the solvent composition and are equally well coagulated in all solvent systems studied. The findings can be applied to the removal of these substances from aqueous alcoholic plant extracts using the electrocoagulation technique. Full article
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