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Molecules, Volume 5, Issue 3 (March 2000) – 160 articles , Pages 200-636

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39 KiB  
Article
Synthesis of Crown Ethers Containing a Rubicene Moiety
by Mario Smet and Wim Dehaen
Molecules 2000, 5(3), 620-628; https://doi.org/10.3390/50300620 - 22 Mar 2000
Cited by 6 | Viewed by 7569
Abstract
A symmetrically disubstituted derivative of the highly fluorescing and photostable rubicene was incorporated in a macrocycle using high dilution conditions and a hydroxyrubicene was functionalized with a modified aminobenzo-15-crown-5. Full article
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Scheme 1

15 KiB  
Abstract
Influence of Some Thia- or Azasubstituted Butyric Acid Derivatives on the Chemical Shift of the Benzene Ring Carbon Atoms
by Johannes Fröhlich, Fritz Sauter and Viktor Milata
Molecules 2000, 5(3), 616-619; https://doi.org/10.3390/50300616 - 22 Mar 2000
Cited by 1 | Viewed by 5348
Abstract
Eight thia- or azasubstituted butyric acid derivatives were prepared and the influence of these substituents on the chemical shifts of the benzene ring carbon atoms was studied. Full article
18 KiB  
Abstract
Grindelic Acid Production in Grindelia Pulchella Cell Suspension Cultures Elicited with CuSO4
by X. E. Hernández, M. B. Kurina Sanz and O. S. Giordano
Molecules 2000, 5(3), 614-615; https://doi.org/10.3390/50300614 - 22 Mar 2000
Cited by 3 | Viewed by 4886 Show Figures

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16 KiB  
Abstract
Reaction Mechanism for the Cyclization of 3-[γ,γ-Dimethylallyl]Coumaric Acid Methyl Ester in Dimethyl Sulfoxide (DMSO)
by E. J. Borkowski, C. E. Ardanaz, P. C. Rossomando and C. E. Tonn
Molecules 2000, 5(3), 612-613; https://doi.org/10.3390/50300612 - 22 Mar 2000
Viewed by 5106 Show Figures

Scheme 1

17 KiB  
Abstract
Synthesis of 2,3-Butanedione over TS-1, Ti-NCl, TiMCM-41, Ti-Beta, Fe-Si, Fe-Beta and VS-1 Zeolites
by Andrea Beltramone, Marcos Gomez, Liliana Pierella and Oscar Anunziata
Molecules 2000, 5(3), 610-611; https://doi.org/10.3390/50300610 - 22 Mar 2000
Cited by 3 | Viewed by 6170
Abstract
The purpose of this work is the synthesis of 2,3-butanedione (diacetyl) by selective oxidation of 2-butanone (methyl ethyl ketone) in the presence of O2 and H2O2 30% as oxidants. All the tests were performed over several selective oxidation zeolite [...] Read more.
The purpose of this work is the synthesis of 2,3-butanedione (diacetyl) by selective oxidation of 2-butanone (methyl ethyl ketone) in the presence of O2 and H2O2 30% as oxidants. All the tests were performed over several selective oxidation zeolite catalysts, synthesized and characterized in our laboratory. Full article
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28 KiB  
Abstract
Structure-Properties Relationship of Dimeric Surfactants from Butyl Glucosides
by Mariano J. L. Castro, José Kovensky and Alicia Fernández Cirelli
Molecules 2000, 5(3), 608-609; https://doi.org/10.3390/50300608 - 22 Mar 2000
Cited by 10 | Viewed by 6085
Abstract
Carbohydrate containing dimeric surfactants were synthesized starting from Dglucose. Three different spacers were used to link the sugar moieties. The critical micelle concentration (CMC) for these new compounds was determined. Full article
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18 KiB  
Abstract
Phytochemical Study Conyza Sophiaefolia. Antiinflammatory Activity
by M. J. Simirgiotis, L. S. Favier, P. C. Rossomando, C. E. Tonn, A. Juarez and O. S. Giordano
Molecules 2000, 5(3), 605-607; https://doi.org/10.3390/50300605 - 22 Mar 2000
Cited by 1 | Viewed by 7959
Abstract
From the aerial parts of Conyza sophiaefolia a new alicyclic furan diterpene was isolated and characterized as an E-isomer in C6 of centipedic acid. In addition, the new clerodane type diterpene 12-epi-bacchotricuneatin A as well as two known related diterpenoids were identified. [...] Read more.
From the aerial parts of Conyza sophiaefolia a new alicyclic furan diterpene was isolated and characterized as an E-isomer in C6 of centipedic acid. In addition, the new clerodane type diterpene 12-epi-bacchotricuneatin A as well as two known related diterpenoids were identified. The flavone apigenine was also isolated. Structures were determined on the basis of spectroscopic evidence. Full article
32 KiB  
Abstract
Synthesis and Computational Simulation of New Phosphorilated Sulfoximines with Insecticidal Activity
by M. E. Bellozas Reinhard and S. A. Licastrode
Molecules 2000, 5(3), 602-604; https://doi.org/10.3390/50300602 - 22 Mar 2000
Viewed by 6054
Abstract
New organophosphorus insecticides of dialkylsulphoximines derived with activity upon acetylcholinesterase were synthesized. The obtained compounds were characterized by NMR and IR, and anticholinesterase activity and toxicity was measured. A simulation through computer was done in order to establish the relationship between structure and [...] Read more.
New organophosphorus insecticides of dialkylsulphoximines derived with activity upon acetylcholinesterase were synthesized. The obtained compounds were characterized by NMR and IR, and anticholinesterase activity and toxicity was measured. A simulation through computer was done in order to establish the relationship between structure and activity. Full article
16 KiB  
Abstract
O-Sulfated Derivatives of Glucuronic Acid
by Mariano J. L. Castro, Natalia Salmaso, José Kovensky and Alicia Fernández Cirelli
Molecules 2000, 5(3), 600-601; https://doi.org/10.3390/50300600 - 22 Mar 2000
Cited by 2 | Viewed by 7669
Abstract
4-O-Substituted D-glucuronic acid derivatives were synthesized from D-glucose in order to study the regioselectivity of sulfation. Full article
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14 KiB  
Abstract
Enantioselective Addition of Grignard Reagents to Aldehydes
by Pablo Englebienne, Hernan Schulz and Norma Nudelman
Molecules 2000, 5(3), 598-599; https://doi.org/10.3390/50300598 - 22 Mar 2000
Viewed by 7521
Abstract
The addition of Grignard reagents to aldehydes in the presence of chiral aminoalcohols shows a moderate enantioselectivity. The study carried out with a series of ligands allows the correlation between the structural characteristics and their reactivity. Full article
20 KiB  
Abstract
Polymerization Mechanism of α,α’-bis(Tetrahydrothiophenio)-β-xylene Dichloride
by Marcela Almassio and Raúl O. Garay
Molecules 2000, 5(3), 596-597; https://doi.org/10.3390/50300596 - 22 Mar 2000
Cited by 1 | Viewed by 6969
Abstract
A experimental study was performed regarding the influence of the base nature and solvent on the reactive intermediate concentration in the base-promoted bissulfonium salts polymerization. Such polymerization reaction is part of a synthetic procedure used to prepare conjugated polymers. In addition, a theoretical [...] Read more.
A experimental study was performed regarding the influence of the base nature and solvent on the reactive intermediate concentration in the base-promoted bissulfonium salts polymerization. Such polymerization reaction is part of a synthetic procedure used to prepare conjugated polymers. In addition, a theoretical study suggest that a one-electron transfer could be involved in the initiation step. Full article
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19 KiB  
Abstract
Stereoselective Synthesis of 8-Trialkylstannylmenthols
by Sandra D. Mandolesi, Nelda N. Giagante, Verónica Dodero and Julio C. Podestá
Molecules 2000, 5(3), 594-595; https://doi.org/10.3390/50300594 - 22 Mar 2000
Cited by 1 | Viewed by 5661
Abstract
Trialkyltin menthones of type 2 are obtained selectively by 1,4-addition of trialkylstannyl lithium to (-)-pulegone. Reduction of 2 with borane in THF using as catalyst the reagent prepared from borane and (S)-valinol gave a mixture of the corresponding trialkyltin alcohols 3 (Me: 84%; [...] Read more.
Trialkyltin menthones of type 2 are obtained selectively by 1,4-addition of trialkylstannyl lithium to (-)-pulegone. Reduction of 2 with borane in THF using as catalyst the reagent prepared from borane and (S)-valinol gave a mixture of the corresponding trialkyltin alcohols 3 (Me: 84%; n-Bu: 90,6%) and 4 (Me: 16% and n-Bu: 9,4%). Full article
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28 KiB  
Abstract
Fluorescence Resonance Energy Transfer Using Spiropyran and Diarylethene Photochromic Acceptors
by L. Giordano, J. Macareno, L. Song, T. M. Jovin, M. Irie and E. A. Jares-Erijman
Molecules 2000, 5(3), 591-593; https://doi.org/10.3390/50300591 - 22 Mar 2000
Cited by 10 | Viewed by 6840
Abstract
We describe the preparation and photophysical characterization of two model compounds designed to test a new approach for the quantitative determination of Fluorescence Resonance Energy Transfer (FRET) in biological systems. The method enables modulation of FRET by exploiting the unique reversible spectral properties [...] Read more.
We describe the preparation and photophysical characterization of two model compounds designed to test a new approach for the quantitative determination of Fluorescence Resonance Energy Transfer (FRET) in biological systems. The method enables modulation of FRET by exploiting the unique reversible spectral properties of photochromic diarylethenes and spiropyrans to create switchable energy acceptors. Full article
17 KiB  
Abstract
Catalytic Hydrogenation Reaction of Naringin-Chalcone. Study of the Electrochemical Reaction
by M. A. Nazareno, A. N. Giannuzzo, H. T. Mishima and B. A. López de Mishima
Molecules 2000, 5(3), 589-590; https://doi.org/10.3390/50300589 - 22 Mar 2000
Cited by 1 | Viewed by 9569
Abstract
The electrocatalytic hydrogenation reaction of naringin derivated chalcone is studied. The reaction is carried out with different catalysts in order to compare with the classic catalytic hydrogenation. Full article
16 KiB  
Abstract
Solvatochromic and Kinetic Response Models in (Ethyl Acetate + Chloroform or Methanol) Solvent Mixtures
by P. Mancini, C. Adam, A. Del C. Pérez and L. R. Vottero
Molecules 2000, 5(3), 587-588; https://doi.org/10.3390/50300587 - 22 Mar 2000
Cited by 1 | Viewed by 5922
Abstract
The present work analyzes the solvent effects upon the solvatochromic response models for a set of chemical probes and the kinetic response models for an aromatic nucleophilic substitution reaction, in binary mixtures in which both pure components are able to form intersolvent complexes [...] Read more.
The present work analyzes the solvent effects upon the solvatochromic response models for a set of chemical probes and the kinetic response models for an aromatic nucleophilic substitution reaction, in binary mixtures in which both pure components are able to form intersolvent complexes by hydrogen bonding. Full article
21 KiB  
Abstract
A Conformational Study of Flexible Cyclic Compounds (Hydrocarbon Rings of 9-12 Members)
by F. Suvire, S. Rodríguez, L. Santagata, A. Rodríguez and R. Enriz
Molecules 2000, 5(3), 585-586; https://doi.org/10.3390/50300585 - 22 Mar 2000
Cited by 2 | Viewed by 7386
Abstract
We report here a conformational study of cyclic flexible compounds (rings with 9-12 members). Two methods of systematic search for the minima were used. The results were compared with those obtained using other exploratory methods. Full article
308 KiB  
Abstract
Molecular Interactions Between the Active Sites of RGD (Arg-Gly-Asp) with its Receptor (Integrine)
by F. Suivre, R. Floridia, F. Giannini, A. Rodriguez, R. Enriz and E. Jauregui
Molecules 2000, 5(3), 583-584; https://doi.org/10.3390/50300583 - 22 Mar 2000
Cited by 3 | Viewed by 7556
Abstract
A study of the molecular interactions between the active sites of RGD (Arg-Gly-Asp) with it Receptor using simultaions is reported. Our calculations indicate that the guanidine-carboxylate complex is energetically favourd with respect to the guanidine-methyl tetrazole complex. Full article
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17 KiB  
Abstract
The Importance of Keto-Enol Forms of Arylpropanoids Acting as Antifungal Compounds
by F. Giannini, C. Devia, A. Rodríguez, R. Enriz, F. Suvire, H. Baldoni, R. Furlan and S. Zacchino
Molecules 2000, 5(3), 580-582; https://doi.org/10.3390/50300580 - 22 Mar 2000
Cited by 5 | Viewed by 6517
Abstract
We report here the importance of a keto-enol equilibrium of an arylpropanoid series acting as antifungal agents. An interesting relationship between ln MIC, ∆E enolization and net atomic charges was found. Two compounds were synthesized and their MIC evaluated in order to prove [...] Read more.
We report here the importance of a keto-enol equilibrium of an arylpropanoid series acting as antifungal agents. An interesting relationship between ln MIC, ∆E enolization and net atomic charges was found. Two compounds were synthesized and their MIC evaluated in order to prove the above relationship. Full article
16 KiB  
Abstract
Kinetics of the Aromatic Nucleophilic Substitution Reaction Between 1-Fluoro-2,4-Dinitrobenzene and Perhydroazepine in Ethyl Acetate + Chloroform Solvent Mixtures
by P. M. Mancini, G. Fortunato and A. J. Terenzani
Molecules 2000, 5(3), 578-579; https://doi.org/10.3390/50300578 - 22 Mar 2000
Viewed by 6056
Abstract
In the present work, the kinetic behavior of the title reaction in ethyl acetate + chloroform solvent mixtures is studied. The experimental results are compared with previous findings. Full article
15 KiB  
Abstract
Study of the Cytotoxic and Antifungal Activities of Neolignans 8.O.4´ and Structurally Related Compounds
by R. D. Enriz, F. Giannini, E. Correche, M. Carrasco, S. Zacchino and P. Matyus
Molecules 2000, 5(3), 576-577; https://doi.org/10.3390/50300576 - 22 Mar 2000
Cited by 1 | Viewed by 7482
Abstract
In the present work we report the antifungal and cytotoxic activities of a neolignan 8.O.4´series. The most active antifungal compounds show a significant cytotoxic effect which might be related. Full article
16 KiB  
Abstract
Development and Validation of a Chromatographic Method for the Analysis of Multicompound Pharmaceutical Preparations
by Carola Ferreyra, Cristina Ortiz and M. M. De Bertorello
Molecules 2000, 5(3), 574-575; https://doi.org/10.3390/50300574 - 22 Mar 2000
Cited by 1 | Viewed by 5552
Abstract
A reverse phase high performance liquid chromatographic assay was carried out for the simultaneous determination of two out of three active principles present in a pharmaceutical preparation. This method was developed to assess the quality of the product. Full article
20 KiB  
Abstract
Bioactive Constituents of Conyza Albida
by A. Del V. Pacciaroni, L. Ariza Espinar, E. Mongelli, A. Romano, G. Ciccia and G. L. Silva
Molecules 2000, 5(3), 571-573; https://doi.org/10.3390/50300571 - 22 Mar 2000
Cited by 4 | Viewed by 6075
Abstract
Alkynes and spathulenol were isolated from Conyza albida (Asteraceae); some of the compounds were lethal against Artemia sp. and cytotoxic against KB cells. Full article
18 KiB  
Abstract
Chemical Study of the Essential Oil of Mutisia Friesiana
by C. I. Viturro and J. De la Fuente
Molecules 2000, 5(3), 568-570; https://doi.org/10.3390/50300568 - 22 Mar 2000
Cited by 4 | Viewed by 7518
Abstract
The composition of essential oil of Mutisia friesiana (Asteracae) was studied. The oil is a complex system in which 127 compounds were identified. The major components are monoterpenes: b-phellandrene, (Z)-β-ocimene, α and β-pinene and sabinene. Full article
14 KiB  
Abstract
Separation of the Pigment of an Amaranth
by Gladis Ester Scoles, Silvia Haydeé Pattacini and Guillermo Federico Covas
Molecules 2000, 5(3), 566-567; https://doi.org/10.3390/50300566 - 22 Mar 2000
Cited by 2 | Viewed by 6627
Abstract
It is known that current quality requirements require the utilization of natural colorants in the foods. The objective of the present work is to extract the pigment amaranthus from fresh leaves of Amaranthus hypochondriacus L. cv Don Pedro to characterize it through spectroscopic [...] Read more.
It is known that current quality requirements require the utilization of natural colorants in the foods. The objective of the present work is to extract the pigment amaranthus from fresh leaves of Amaranthus hypochondriacus L. cv Don Pedro to characterize it through spectroscopic techniques, to be used as natural colorants. Full article
17 KiB  
Abstract
First Synthesis of (20S) 3β,16β-Dihydroxy-5-pregnen-20,16-carbolactone (Diosgeninlactone)
by Andrea C. Bruttomesso and Eduardo G. Gros
Molecules 2000, 5(3), 564-565; https://doi.org/10.3390/50300564 - 22 Mar 2000
Cited by 2 | Viewed by 4985
Abstract
Diosgeninlactone (1), a natural product from Solanum vespertilio, was stereoselectively synthesized in high yield from 3β-hydroxy-5-androstene. Full article
15 KiB  
Abstract
A Simple Method for N-Phenoxyethylation of Anilines
by G. P. Romanelli, J. L. Jios, O. Guaymas, R. Piovoso and J. C. Autino
Molecules 2000, 5(3), 562-563; https://doi.org/10.3390/50300562 - 22 Mar 2000
Cited by 1 | Viewed by 7814
Abstract
We wanted to search for new reaction conditions to prepare the title compounds, to be checked later in novel syntheses of heterocyclic compounds. To the best of our knowledge, there was no report in the literature of any well-established method for the preparation [...] Read more.
We wanted to search for new reaction conditions to prepare the title compounds, to be checked later in novel syntheses of heterocyclic compounds. To the best of our knowledge, there was no report in the literature of any well-established method for the preparation of N-(2-phenoxyethyl)anilines 1. Full article
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16 KiB  
Abstract
Catalytic Activity of MEL Zeolites Modified with Metallic Couples for the Conversion of Ethane
by Griselda Eimer, Pedro Girola, Lorena Tomas, Liliana B. Pierella and Oscar A. Anunziata
Molecules 2000, 5(3), 560-561; https://doi.org/10.3390/50300560 - 22 Mar 2000
Cited by 1 | Viewed by 5884
Abstract
The transformation of ethane into aromatic hydrocarbons over Zn-metal- containing zeolites at W/F=10 gh/mol and 550°C was studied in a flow reactor at atmospheric pressure. Zn-metal-zeolite modified the activation mode of the alkane, generating highly reactive intermediates and enhancing the aromatic selectivity. Full article
18 KiB  
Abstract
Integral Chemical Analysis of the Amaranth (Amaranthus greggii S. Wats)
by Silvia H. Pattacini, Gladis E. Scoles and Guillermo F. Covas
Molecules 2000, 5(3), 557-559; https://doi.org/10.3390/50300559 - 22 Mar 2000
Viewed by 6241
Abstract
The objective of this work was to obtain information on Amaranthus greggii S. Wats., related to its nutritional value, its agricultural application as leaf vegetable and for animal consumption. The following variables were analyzed: dampness, ashes, protein, mineral, ethereal extract (fat), brute fiber, [...] Read more.
The objective of this work was to obtain information on Amaranthus greggii S. Wats., related to its nutritional value, its agricultural application as leaf vegetable and for animal consumption. The following variables were analyzed: dampness, ashes, protein, mineral, ethereal extract (fat), brute fiber, oxalic acid, nitrates and carbohydrates. Full article
17 KiB  
Abstract
Synthesis of a Thienothiophene Conjugated Polymer
by Alejandra S. Diez, Silvana Saidman and Raúl O. Garay
Molecules 2000, 5(3), 555-556; https://doi.org/10.3390/50300555 - 22 Mar 2000
Cited by 13 | Viewed by 7842
Abstract
A new conducting polymer was prepared by chemical and electrochemical polymerization of 3,6-dimethylthieno[3,2-b]thiophene. The galvanostatic deposition afforded uniform, adherent and dark blue films of PDMTT. Electrochemical characterization by cyclic voltammetry showed that it can be repeatedly driven between the doped and undoped species [...] Read more.
A new conducting polymer was prepared by chemical and electrochemical polymerization of 3,6-dimethylthieno[3,2-b]thiophene. The galvanostatic deposition afforded uniform, adherent and dark blue films of PDMTT. Electrochemical characterization by cyclic voltammetry showed that it can be repeatedly driven between the doped and undoped species with a coulombic efficiency of nearly 100%. Full article
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16 KiB  
Abstract
Comparison Between Aqueous and Nonaqueous AOT-Heptane Reverse Micelles Using Acridine Orange as Molecular Probe
by R. D. Falcone, N. M. Correa, M. A. Biasutti and J. J. Silber
Molecules 2000, 5(3), 553-554; https://doi.org/10.3390/50300553 - 22 Mar 2000
Cited by 6 | Viewed by 7682
Abstract
Aqueous and nonaqueous AOT/n-heptane reverse micelles where characterized by UV-Visible and fluorescence spectroscopy of AO. The study shows the presence of the dimer in aqueous reverse micelles which is not present in the nonaqueous systems. It seems that there is a conversion of [...] Read more.
Aqueous and nonaqueous AOT/n-heptane reverse micelles where characterized by UV-Visible and fluorescence spectroscopy of AO. The study shows the presence of the dimer in aqueous reverse micelles which is not present in the nonaqueous systems. It seems that there is a conversion of the dimer to monomer in the aqueous reverse micelles at high AOT concentration. In the nonaqueous systems, there is only partition of the monomer. The apparent constants of these processes were calculated. Full article
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