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

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Open AccessArticle Synthesis of Crown Ethers Containing a Rubicene Moiety
Molecules 2000, 5(3), 620-628; https://doi.org/10.3390/50300620
Received: 10 February 2000 / Accepted: 14 March 2000 / Published: 22 March 2000
Cited by 5 | PDF Full-text (39 KB) | HTML Full-text | XML Full-text
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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Open AccessAbstract Influence of Some Thia- or Azasubstituted Butyric Acid Derivatives on the Chemical Shift of the Benzene Ring Carbon Atoms
Molecules 2000, 5(3), 616-619; https://doi.org/10.3390/50300616
Received: 26 January 2000 / Accepted: 17 March 2000 / Published: 22 March 2000
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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
Open AccessAbstract Grindelic Acid Production in Grindelia Pulchella Cell Suspension Cultures Elicited with CuSO4
Molecules 2000, 5(3), 614-615; https://doi.org/10.3390/50300614
Published: 22 March 2000
Cited by 2 | PDF Full-text (18 KB) | HTML Full-text | XML Full-text Figures

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Open AccessAbstract Reaction Mechanism for the Cyclization of 3-[γ,γ-Dimethylallyl]Coumaric Acid Methyl Ester in Dimethyl Sulfoxide (DMSO)
Molecules 2000, 5(3), 612-613; https://doi.org/10.3390/50300612
Published: 22 March 2000
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Open AccessAbstract Synthesis of 2,3-Butanedione over TS-1, Ti-NCl, TiMCM-41, Ti-Beta, Fe-Si, Fe-Beta and VS-1 Zeolites
Molecules 2000, 5(3), 610-611; https://doi.org/10.3390/50300610
Published: 22 March 2000
Cited by 2 | PDF Full-text (17 KB) | HTML Full-text | XML Full-text
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
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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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Open AccessAbstract Structure-Properties Relationship of Dimeric Surfactants from Butyl Glucosides
Molecules 2000, 5(3), 608-609; https://doi.org/10.3390/50300608
Published: 22 March 2000
Cited by 4 | PDF Full-text (28 KB) | HTML Full-text | XML Full-text
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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Open AccessAbstract Phytochemical Study Conyza Sophiaefolia. Antiinflammatory Activity
Molecules 2000, 5(3), 605-607; https://doi.org/10.3390/50300605
Published: 22 March 2000
Cited by 1 | PDF Full-text (18 KB) | HTML Full-text | XML Full-text
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.
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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
Open AccessAbstract Synthesis and Computational Simulation of New Phosphorilated Sulfoximines with Insecticidal Activity
Molecules 2000, 5(3), 602-604; https://doi.org/10.3390/50300602
Published: 22 March 2000
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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
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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
Open AccessAbstract O-Sulfated Derivatives of Glucuronic Acid
Molecules 2000, 5(3), 600-601; https://doi.org/10.3390/50300600
Published: 22 March 2000
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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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Open AccessAbstract Enantioselective Addition of Grignard Reagents to Aldehydes
Molecules 2000, 5(3), 598-599; https://doi.org/10.3390/50300598
Published: 22 March 2000
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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
Open AccessAbstract Polymerization Mechanism of α,α’-bis(Tetrahydrothiophenio)-β-xylene Dichloride
Molecules 2000, 5(3), 596-597; https://doi.org/10.3390/50300596
Published: 22 March 2000
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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
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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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Open AccessAbstract Stereoselective Synthesis of 8-Trialkylstannylmenthols
Molecules 2000, 5(3), 594-595; https://doi.org/10.3390/50300594
Published: 22 March 2000
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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%;
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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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Open AccessAbstract Fluorescence Resonance Energy Transfer Using Spiropyran and Diarylethene Photochromic Acceptors
Molecules 2000, 5(3), 591-593; https://doi.org/10.3390/50300591
Published: 22 March 2000
Cited by 9 | PDF Full-text (28 KB) | HTML Full-text | XML Full-text
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
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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
Open AccessAbstract Catalytic Hydrogenation Reaction of Naringin-Chalcone. Study of the Electrochemical Reaction
Molecules 2000, 5(3), 589-590; https://doi.org/10.3390/50300589
Published: 22 March 2000
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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
Open AccessAbstract Solvatochromic and Kinetic Response Models in (Ethyl Acetate + Chloroform or Methanol) Solvent Mixtures
Molecules 2000, 5(3), 587-588; https://doi.org/10.3390/50300587
Published: 22 March 2000
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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
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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
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