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Molecules, Volume 7, Issue 7 (July 2002) – 8 articles , Pages 507-565

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Open AccessArticle
Annellation of Triazole and Tetrazole Systems onto Pyrrolo[2,3-d]pyrimidines: Synthesis of Tetrazolo[1,5-c]-pyrrolo[3,2-e]-pyrimidines and Triazolo[1,5-c]pyrrolo-[3,2-e]pyrimidines as Potential Antibacterial Agents
Molecules 2002, 7(7), 554-565; https://doi.org/10.3390/70700554 - 31 Jul 2002
Cited by 37 | Viewed by 7022
Abstract
Syntheses of several novel 4-chloropyrrolo[2,3-d]pyrimidines (1), 4-hydrazinopyrrolo[2,3-d]pyrimidines (2) and 3-amino-4-iminopyrrolo[2,3-d]pyrimidines (7) and their use in the synthesis of tetrazolo[1,5-c]pyrrolo[3,2-e]pyrimidines (3) and triazolo[1,5-c]pyrrolo[3,2-e]pyrimidines (4) required for biological screening are reported. Full article
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Open AccessArticle
Synthesis and Structure of the Cadmium (II) Complex: [Cd(C5H5N)2(S2CO-n-C4H9)2]
Molecules 2002, 7(7), 549-553; https://doi.org/10.3390/70700549 - 31 Jul 2002
Cited by 24 | Viewed by 7541
Abstract
The [Cd(C5H5N)2(S2CO-n-C4H9)2] adduct of pyridine with [Cd(S2CO-n-C4H9)2]n was synthesized and characterized by IR, elemental analysis,1H-NMR and X-ray diffraction analysis. The crystasl [...] Read more.
The [Cd(C5H5N)2(S2CO-n-C4H9)2] adduct of pyridine with [Cd(S2CO-n-C4H9)2]n was synthesized and characterized by IR, elemental analysis,1H-NMR and X-ray diffraction analysis. The crystasl belong to the monoclinic system, space group P2(1)/c with Z=2. Cell dimensions are a=1.1094(12), b=0.6152(6), c=1.7985(19) nm, • =96.148(2)°, V=1.2204(2)nm3. The structure was refined to R=0.0246 and wR=0.0645 for 2624 reflections with I>2•(I). The complex has a centrosymmetric molecule structure. Full article
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Open AccessArticle
Michael Reactions of Arylidenesulfonylacetonitriles. A New Route to Polyfunctional Benzo[a]quinolizines
Molecules 2002, 7(7), 540-548; https://doi.org/10.3390/70700540 - 31 Jul 2002
Cited by 10 | Viewed by 5439
Abstract
Arylidenesulfonylacetonitriles react in acetonitrile with 1-methylisoquinoline and isoquinolin-1-yl-acetonitrile in the presence of piperidine to give benzo[a]quinolizines 6,9 and 7,10, respectively. The structures of the products were established on the basis of elemental and spectral analyses and their chemical reactivity. Full article
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Open AccessArticle
Synthesis and Theoretical Study of a New Type of Pentacyclic bis-Benzothiazolium Compound
Molecules 2002, 7(7), 534-539; https://doi.org/10.3390/70700534 - 31 Jul 2002
Cited by 6 | Viewed by 7107
Abstract
The synthesis of a new type of pentacyclic benzothiazolium compound -6,13-dihydropyrazino[2,1-b:5,4-b´]bis(1,3-benzothiazole)-7,14-diiumdibromide (2), is reported. Compound 2 was prepared by dimerization of 2-(bromomethyl)benzothiazole. Quantum chemical calculation studies have been carried out on the structures of possible isomers of 2, as well as the products [...] Read more.
The synthesis of a new type of pentacyclic benzothiazolium compound -6,13-dihydropyrazino[2,1-b:5,4-b´]bis(1,3-benzothiazole)-7,14-diiumdibromide (2), is reported. Compound 2 was prepared by dimerization of 2-(bromomethyl)benzothiazole. Quantum chemical calculation studies have been carried out on the structures of possible isomers of 2, as well as the products of its deprotonation reactions. Full article
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Open AccessArticle
Hydrogen Transfer from Hantzsch 1,4-Dihydropyridines to Carbon-Carbon Double Bonds under Microwave Irradiation
Molecules 2002, 7(7), 528-533; https://doi.org/10.3390/70700528 - 31 Jul 2002
Cited by 35 | Viewed by 8725
Abstract
1,4-Dihydropyridines (DHPs) have been used in the reduction of carbon-carbon double bonds under microwave irradiation without solvent. The efficiency of the reactions is dramatically dependent on the steric effects in the DHPs and on the electronic effects in the olefins. Full article
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Open AccessArticle
Total Synthesis of (-)-(7S,10R)-Calamenene and (-)-(7S,10R)-2-Hydroxycalamenene by Use of a Ring-Closing Metathesis Reaction. A Comparison of the cis- and trans-Isomers
Molecules 2002, 7(7), 517-527; https://doi.org/10.3390/70700517 - 31 Jul 2002
Cited by 17 | Viewed by 7124
Abstract
The title compounds have been synthesized starting from l-menthone by application of a ring-closing metathesis reaction to confirm their reported absolute and relative stereochemistry. Comparisons of the NMR spectra and specific rotations are also discussed. Full article
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Open AccessArticle
Synthetic Studies on Optically Active Schiff-base Ligands Derived from Condensation of 2-Hydroxyacetophenone and Chiral Diamines
Molecules 2002, 7(7), 511-516; https://doi.org/10.3390/70700511 - 31 Jul 2002
Cited by 56 | Viewed by 6504
Abstract
Three optically active Schiff-base ligands have been prepared by condensation of 2-hydroxyacetophenone with (1R,2R)-(-)-1,2-diaminocyclohexane, (1S,2S)-(-)-1,2-diphenylethylenediamine or R-(+)-2,2’-diamino-1,1’-binaphthalene, respectively. The products have been characterized by their IR, 1H- and 13C-NMR spectra. Full article
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Open AccessArticle
Synthesis of Novel Quinazoline Derivatives via Pyrimidine ortho-Quinodimethane
Molecules 2002, 7(7), 507-510; https://doi.org/10.3390/70700507 - 31 Jul 2002
Cited by 7 | Viewed by 7893
Abstract
The [4+2] cycloaddition between 2,4-diphenylpyrimidine ortho-quinodimethane and dimethyl acetylenedicarboxylate leads to 2,4-diphenylquinazoline-6,7-dicarboxylate (6). 2,4-Diphenylfuro[3,4-g]quinazoline-6,8-dione (7) is also obtained by basic hydrolysis of compound 6, followed by the closure of the resulting diacid in acetic anhydride. Full article
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