SVIBOR - Papers quoted in CC - project code: 1-07-333

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Papers quoted in Current Contents on project 1-07-333


Quoted papers: 15
Other papers: 27
Total: 42


Title: Chiral Chromenes: Synthesis, Separation of Enantiomers and Barriers to Racemization

Authors:
Lončar, Linda
Troetsch, Thomas
Mannschreck, Albrecht
Otočan, Klaudio
Mintas, Mladen
Journal: Croat.Chem. Acta
Number: 1
Volume: 66
Year: 1993
Pages: from 209 to 216
Number of references: 9
Language: engleski
Summary: 2H-chromenes 3 and 4 have been synthesized by reduction of the appropriate lactone with diisobutylaluminium hydride and subsequent O-alylation of the resulting lactols. Separation or enrichment of enantiomers were achieved by liquid chromatogreaphgy on triacetylcellulose and tribenyoylcellulose, (+)-3 and (-)-3 being separated almost completely, while an enrichment of the enantiomers of 4 was achieved by using the recycling procedure. The barriers for the interconversion of enantiomers of 4 was achieved by using the recycling procedure. The barriers for the interconversion of enantiomers of 3 and 4 were determined by thermal racemization of enantiomers.

Title: The Enantiomers of Chromenes and their Barriers to Reversible Ring Opening

Authors:
Troetsch, Thomas
Leiminer, A.
Lončar, Linda
Otočan, Klaudio
Stephan, B.
Mintas, Mladen
Mannschreck, Albrecht
Journal: Chirality
Volume: 5
Year: 1993
Pages: from 402 to 0
Language: engleski

Title: Synthesis, Separation of Enantiomers and Barriers to Racemization of Some Sterically Hindered N-Aryl-1,2,3,4-tetrahydro-3,3-dimethyl-quinoline diones and Their Thio Analogues

Authors:
Mannschreck, Albrecht
Šarac-Arneri, Ruža (45996)
Mintas, Mladen (31831)
Pustet, N.
Journal: Monatsh. Chem.
Volume: 125
Year: 1994
Pages: from 457 to 468
Number of references: 19
Language: engleski
Summary: The novel N-aryl-1,2,3,4-tetrahydro-3,3-dimethyl-2,4-quinolinediones 1,4 and 8 were thiated with Lawesson reagent and P4S10 to yield the monothio derivatives 2 and 5 and the dithio compounds 3,4 and 9. Their enantiomers were separated by liquid chromatography on triacethyl- or tribenzoylcellulose. Rotation barriers for 1-4 and 8 were determined by thermal racemization and discussed in terms of steric effects.
Keywords: N-Aryl-1,2,3,4-tetrahydro-3,3-dimethyl-2,4-quinolinediones, N-Aryl-1,2,3,4-tetrahydro-3,3-dimethyl-quinoline-2-one-4-thiones; N-Aryl-1,2,3,4,-tetrahydro-3,3-dimethyl-2,4-quinoline-dithiones; Enantioselective chromatography

Title: Regiospecific Synthesis and X-Ray Structural Study of Trifluoromethyl Substituted Dibenzosemibullvalene

Authors:
Burek, Gordana
Lončar, Linda
Mintas, Mladen
Hergold-Brundić, Antonija (15690)
Nagl, Ante (33032)
Journal: Croat.Chem. Acta
ISSN: 0011-1643
Volume: 67
Year: 1994
Pages: from 155 to 161
Number of references: 14
Language: engleski
Summary: Preparation of the novel regiospecifically trifluoromethyl substituted dibenzobarrelene 5 and dibenzosemibullvalene 6 is described. Unequivocal proof for the stereostructure of 6 was obtained by its X-ray crystallographic analysis. Geometrical data from X-ray structural analysis showed that the ester carbonyl groups adopt unfavorable conformations for conjugative interactions with respect to the cyclopropane ring involved in the skeleton of 6.

Title: Photoelectron Spectra of Alkyldiaziridines

Authors:
Mintas, Mladen
Mannschreck, Albrecht
P. McGlynn, Sean
Klasinc, Leo
Journal: J.Chem.Soc.Perkin Trans.
ISSN: 011 -52J
Volume: 2
Year: 1994
Pages: from 2059 to 2062
Number of references: 40
Language: engleski
Summary: HeI photoelectron (PES) spectra have been obtained for six trisubstituted and tree tetrasubstituted diaziridines: 1,3,3-trimethyldiaziridine (1), 1-isopropyl-3,3-dimethyldiaziridine (2), 1-methzlspiro(diaziridine-3,1'-cyclopentane) (3), 1-benzyl-3,3-dimethyldiaziridine (4), 3-benzyl-1,3-dimethyldiaziridine (5), 3,3-dibenzyl-1-methyldiaziridine (6), tetramethyldiaziridine (7 or Me-1), 1-benzyl-2,3,3-trimethyldiaziridine (8 or Me-4) and 3-benzyl-1,2,3-trimethyldiaziridine (9 or Me-5). Analysis provided information about the outer valence electronic structures and geometric conformations. The observed splitting of the n+ and n- ionization events indicates that all compounds exist in trans configurations, the lone pair-lone pair dihedral angle is 100

Title: Diastereoisomerization and X-Ray Crystal Structure of meso-di-(2H-Chromene-2-yl) Ether

Authors:
Lončar, Linda
Mannschreck, Albrecht
Mintas, Mladen (31831)
Hergold-Brundić, Antonija
Trotsch, Thomas
Nagl, Ante (33032)
Journal: Croat.Chem. Acta
ISSN: 0011-1643
Volume: 68
Year: 1995
Pages: from 233 to 240
Number of references: 19
Language: engleski
Summary: It was shown by X-ray crystal structure analysis that di-(2H-chromene-2-yl)-ether (1) exists in the meso-form, i.e. as (2S, 2'R)-1. The X-ray structural data indicate, also, that geometries of the two 2H-1-benzopyran parts, of which the skeleton of 1 consists, are not identical, that is the molecule is pseudosymmetrical. The meso-1 undergoes thermally induced electrocyclic ring opening and reclosure. Thus, meso-1 equilibrates with enantiomers (2S, 2'S)-1 and (2R, 2'R)-1, as confirmed by their 1H-NMR spectra after preparative separation of stereoisomers using liquid chromatography on triacetylcellulose.

Title: Photochemical synthesis and NMR analysis of novel regiospecifically trifluoromethyl-substituted dibenzosemibullvalene

Authors:
Lončar, Linda
Mintas, Mladen
Vikić-Topić, Dražen
Lukić, Tatjana
Journal: Journal of Flourine Chemistry
ISSN: 0022-1139
Volume: 74
Year: 1995
Pages: from 159 to 164
Number of references: 13
Language: engleski
Summary: Preparation of the novel regiospecific bis(trifluoromethyl)-substituted dibenzobarrelene (2) and dibenzosemibullvalene (3) is described. The stereostructure of compounds 2 and 3 has been deduced on the basis of their 1H, 19F and 13C 1D/2D NMR spectra. Three-bond C-F couplings were used as a structural probe while the longest C-F coupling observed was over four bonds.
Keywords: Photochemical synthesis; Trifluoromethyl-substituted dibenzobarrelene; Trifluoromethyl-substituted dibenzosemibullvalene

Title: Synthesis and X-ray structural study of unsymmetrically substituted dibenzobarrelene

Authors:
Burek, Gordana
Lončar, Linda
Mintas, Mladen
Hergold-Brundić, Antonija
Nagl, Ante (33032)
Journal: Acta Pharm.
ISSN: 1330-0075
Volume: 45
Year: 1995
Pages: from 37 to 43
Number of references: 18
Language: engleski
Summary: Preparation of the novel regiospecifically trifluoromethyl substituted anthracene (2) and dibenzobarrelene (3) containing two trifluoromethyl groups and the hydrophilic diethylamino group substituted unsymmetrically at the vynilenic bridge of the middle ring is described. The stereostructure of 3 is determined by the X-ray crystallographic analysis. The geometrical data obtained by X-ray structural analysis indicate the C-C bond length asymmetry of the central bridge involved in the barrelene skeleton of 3.
Keywords: dibenzobarrelene, trifluoromethylation, X-ray crystallography

Title: The Novel 6-(N-Pyrrolyl)purine Acyclic Nucleosides:1H and 13C NMR X-Ray Structural Study

Authors:
Mintas, Mladen
Vikić-Topić, Dražen
Hergold-Brundić, Antonija
Raić, Silvana
Nagl, Ante (33032)
Journal: Nucleosides & Nucleotides
Year: 1995
Number of references: 28
Language: engleski
Summary: Synthesis of the novel nucleoside analogues containing exocyclic pyrrolo moiety and acyclic side chains attached to the purine ring at N-9 and N-7 is described. The site of alkylation was determined by 1H and 13C NMR on the basis of chemical shifts, C-H coupling constants and and connectivity in NOESY and HETCOR spectra. The N-9 substitution and conformation of 5 and 7 were proved by their X-ray crystallographic analysis.
Keywords: Acyclic purine nucleosides,1H NMR spectroscopy, 13C NMR spectroscopy, X-ray crystallographic analysis

Title: Merocyanine Isomers of Spiro(indolino-indolopyrans): 1H and 13 C NMR and X-Ray Crystal Structure Study

Authors:
Hergold-Brundić, Antonija
Mannschreck, Albrecht
Mintas, Mladen (31831)
Raić, Silvana
Nagl, Ante (33032)
Vorkapić-Furač, Jasna (53001)
Journal: Croat.Chem. Acta
ISSN: 0011-1643
Year: 1995
Number of references: 24
Language: engleski
Summary: The synthesis of the stable merocyanine isomers 4 and 5 of the corresponding spiro(indolino-indolopyrans) is described. The structure of 4 and 5 was deduced on the basis of their 1H and 13C NMR spectra. Geometrical data from X-ray structure analysis show that indolo and indolino rings in 4 are coplanar with central diene bridge. The bond length shortening of the central single bond and the heterocyclic moieties indicate an electron delocalization over the whole molecule.
Keywords: Merocyanine, spiro(indolino-indolopyran), 1H NMR spectroscopy, 13 C NMR spectroscopy, x-ray crystallographic analysis

Title: Mass Spectra of Some 2,4-Disubstituted 1,3-Cyclopentanediones

Authors:
Vorkapić-Furač, Jasna (53001)
Tralić-Kulenović, Vesna
Lazarević, Zvjezdana
Journal: Rapid Communications in Mass Spectrometry
ISSN: 0951-4198
Volume: 8
Year: 1994
Pages: from 323 to 324
Number of references: 7
Language: engleski
Summary: A study of the electron impact mass spectrometry is reported for eight, stable, previously synthesized, enolic isomers of 2-aroyl-4-aracyl-1,3-cyclopentanediones.

Title: Chemical and Electrochemical Synthesis of Some Substituted N,N'-Diacyl-p-phenylenediamines

Authors:
Šuprina, Mihela
Vorkapić-Furač, Jasna (53001)
Journal: Arch.Pharm.
ISSN: 0365-6233
Volume: 326
Year: 1993
Pages: from 447 to 449
Number of references: 5
Language: engleski
Summary: Some N,N'-diacyl-p-phenylenediamines substituted with halogens (2a-c) were prepared. Their polarographic reduction in N,N'-dimethylformamide with Et4NClO4 was performed and discussed. The meshanism of the electrochemical reduction is stated. Large-scale electrolytic reductions 2a-b to 3a-b were performed.

Title: Stimulation of Coleus blumei Benth. callus growth by 1-(6-purinyl)-2,5-dimethylpyrrole

Authors:
Vorkapić-Furač, Jasna (53001)
Kniewald, Zlatko
Bajrović, K
Journal: Pharmazie
Volume: 48
Year: 1993
Pages: from 787 to 788
Number of references: 9
Language: engleski

Title: Reduction mechanism of 3-hydroxy-4-hydroxyiminomethyl-5-hydroxymethyl-1,2-dimethylpyridinium iodide in an acidic medium

Authors:
Vorkapić-Furač, Jasna (53001)
Berković, Katarina
Raspor, Biserka
Journal: Journal of Electroanalytical Chemistry
Volume: 367
Year: 1994
Pages: from 149 to 155
Language: engleski

Title: Genotixic effects examination of PPDO-4 (Pyridoxal-oxime derivative) on prokaryotic and eukaryotic test systems

Authors:
Franekić, Jasna
Pehadžić, Jasminka
Tomičić, Maja
Vorkapić-Furač, Jasna (53001)
Journal: Periodicum Biologorum
ISSN: 0031-5362
Volume: 96
Year: 1994
Pages: from 483 to 485
Number of references: 8
Language: engleski


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