SVIBOR - Papers quoted in CC - project code: 1-07-333
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SVIBOR - Collecting Data on Projects in Croatia
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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