SVIBOR - Papers quoted in CC - project code: 1-07-039
MINISTRY OF SCIENCE AND TECHNOLOGY
Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
E-mail: ured@znanost.hr
SVIBOR - Collecting Data on Projects in Croatia
Papers quoted in Current Contents on project 1-07-039
Quoted papers: 24
Other papers: 55
Total: 79
Title: One-pot Synthesis of New Unsimmetrical
beta-Heteroaryl-o-divinylbenzenes
- Authors:
- Šindler, Marija (47004)
- Stiplošek, Zdenka (44936)
- Vojnović, Dragana
- Metelko, Biserka (52362)
- Marinić, Željko (115246)
Journal: Heterocycles
Number: 12
ISSN: 0385-5414
Volume: 32
Year: 1991
Pages: from 2357 to 2363
Number of references: 17
Language: engleski
Summary: By Wittig reaction of
o-xylylene-bis(triphenylphosphoniumbromide)(1) with aldehydes (2) and
formaldehyde in the presence of base,unsymmetrically substituted
o-divinylbenzenes (3) have beenprepared in one pot.
Keywords: furans, divinylbenzenes, Wittig reaction, synthesis of divinylbenzenes,NMR spectra, UV spectra, spectroscopic properties
Title: Synthesis of New 3-(Phenoxyphenyl)sydnones
- Authors:
- Šindler, Marija (47004)
- Jakopčić, Krešimir (17793)
- Mance, Ana-Dunja (27915)
Journal: Journal of Heterocyclic Chemistry
ISSN: 0022-152X
Volume: 29
Year: 1992
Pages: from 1013 to 1015
Number of references: 12
Language: engleski
Summary: The title compounds were prepared by dehydrocyclization
ofcorresponding substituted N-nitrosoglycines obtained fromisomeric o-, m-
and p-aminodiphenyl ether with ethyl bromoacetateand subsequent nitrosation
of the intermediate N-arylsubstitutedglycines.
Keywords: sydnones, syntesis of sydnones, mesoionic compounds, nitrosation of amino acids, diphenyl ethers, heterocyclic compounds
Title: A Novel Non Photochemical Ring Contraction of 4-Pyrones to
Cyclopent-2-enones
- Authors:
- Jakopčić, Krešimir (17793)
- Kojić, Josipa
- Orhanović, Zlata
- Stiplošek, Zdenka (44936)
- Nagl, Ante (33032)
Journal: Journal of Heterocyclic Chemistry
ISSN: 0022-152X
Volume: 29
Year: 1992
Pages: from 107 to 112
Number of references: 30
Language: engleski
Summary: Unlike commenic acid and most other 4-pyrones, methyl or
ethylcomenate reacts with aromatic amines under mild conditions in thesense
of ring contraction
to3-arylamino-2,4-dihydroxy-2-cyclopentenone-4-carboxylates. Thestructure
of the new cyclopentenone derivatives were determinedfrom their
characteristic spectroscopic behaviour and wasconfirmed by X-ray
crystallographic studies of compound Vb.
Keywords: beta-Hydroxy-4-pyrone, 4-Pyrone ring contraction, 3-Hydroxy-4-pyridone, Cyclopent-2-enone, Comenic acid esters, Aminolysis of hydroxy-4-pyrone, X-ray structural analysis, Rearrangement of hydroxy-4-pyrone, 1H-NMR, 13C-NMR.
Title: Preparation of 3-Hydroxy- and
3-Methoxy-N-heteroaryl-2-methyl-4-pyridone
- Authors:
- Jakopčić, Krešimir (17793)
- Mintas, Mladen (31831)
- Isufi, Islam
Journal: Journal of Heterocyclic Chemistry
ISSN: 0022-152X
Volume: 30
Year: 1993
Pages: from 429 to 433
Number of references: 20
Language: engleski
Summary: A number of new 3-hydroxy- and
3-methoxy-2-methyl-4-pyridonessubstituted on the nitrogen atom with
selected heterocycles hasbeen prepared. Novel chelating propertise of
thehydroxy-compounds are expected.
Keywords: N-Heteroaryl-4-pyridones, Synthesis, Maltol, beta-Hydroxy-4-pyridones, Chelating pyridones, Spectroscopic properties.
Title: 5-Nitro-2-furyl Diimidoyl Disulfides by Iodine Oxidation
of N-Aryl-5-nitro-2-thiofuramides
- Authors:
- Jakopčić, Krešimir (17793)
- Mance, Ana-Dunja (27915)
Journal: Organic Preparations and Procedures Int.
ISSN: 0030-4948
Volume: 26
Year: 1994
Pages: from 560 to 567
Number of references: 22
Language: engleski
Summary: By iodine oxidation of several N-substituted
5-nitro-2-furylthiocarbonamides in the presence of an amine
catalyst,corresponding diimidoyl disulfides has been prepared
andcharacterized. The presence of 5-nitro substituent seems toimprove the
stability of these disulfides.
Keywords: Thioamides, 5-Nitrofuranes, Oxidation of thioamides by iodine, Diimidoyl disulfides, 5-Nitro-2-furyl thiocarbonamides, UV-spectra, IR-spectra, 1H and 13C NMR spectra, Mass spectrometry data.
Title: Absorption and Fluorescence Characteristics of Some
2-Aryl- and 2-Heteroaryl-benzothiazoles in Different Solvents and at
Various pH Values
- Authors:
- Tralić-Kulenović, Vesna (24515)
- Fišer-Jakić, Lelja (12062)
- Lazarević, Zvjezdana (187274)
Journal: Spectroscopy Letters
Number: 9
ISSN: 0038-7010
Volume: 26
Year: 1993
Pages: from 1771 to 1784
Number of references: 16
Language: engleski
Summary: The parameters characterizing the absorption and
fluorescence ofseven 2-substituted benzothiazoles in different solvents and
atvarious acid/base concentrations were studied. It was found thatboth,
kind of substituent and solvent polarity influenced thechanges of the
spectral properties of the examined molecules.
Keywords: Benzothiazoles, Fluorescence, Quantum efficiency.
Title: Synthesis and Absorption Spectral Properties of
Substituted Phenylfurylbenzothiazoles and Their Vinylogues
- Authors:
- Tralić-Kulenović, Vesna (24515)
- Fišer-Jakić, Lelja (12062)
- Lazarević, Zvjezdana (187274)
Journal: Monatshefte fuer Chemie
ISSN: 0026-9247
Volume: 125
Year: 1994
Pages: from 209 to 215
Number of references: 21
Language: engleski
Summary: A number of substituted 2-(5-aryl-2-furyl)benzothiazoles
andtheir vinylogues were synthesized from corresponding5-arylfurfurals by
convenient methods. The yields of products andtheir UV/Vis spectroscopic
properties are substituent-dependent.
Keywords: 2-(5-Aryl-2-furyl)benzothiazoles, 1-(5-Aryl-2-furyl)-2-(2-benzothiazolyl)ethenes, Absorption spectra.
Title: Mass Spectrometry of Some 2-Styryl- and 2,5-Distyryl-furan
and Thiophene Derivatives
- Authors:
- Karminski-Zamola, Grace (20316)
- Bajić, Miroslav (1543)
- Blažević, Nikola (4041)
Journal: Organic Mass Spectrometry
ISSN: 0030-493X
Volume: 27
Year: 1992
Pages: from 615 to 618
Number of references: 6
Language: engleski
Summary: Mass spectra of fourteen 2-styryl- and 2,5-distyrylfuran
and-thiophene derivatives are reported. Each styryl substituent hasan
alpha-carboxylic acid or methyl carboxylate substituent.Although the parent
ion is the base peak for the styryl anddistyryl derivatives, the distyryl
species showed lessfragmentation than the styryl species. In addition to
simple bondcleavages, loss of formic acid or methyl formate was important
inmany of the species, presumably forming acetylenic fragments.
Title: Twofold Photochemical Dehydrocyclization Reaction of
Substituted 2,5-Distyrylthiophenes and 2,5-Distyrylfurans
- Authors:
- Bajić, Miroslav (1543)
- Karminski-Zamola, Grace (20316)
- Blažević, Nikola (4041)
Journal: Croatica Chemica Acta
Number: 4
ISSN: 0011-1643
Volume: 65
Year: 1992
Pages: from 835 to 846
Number of references: 10
Language: engleski
Summary: The photochemistry of 2,5-distyrylthiophenes
and2,5-distyrylfurans was investigated.Dinaphtho/2,1-b:1',2'-d/thiophene
derivatives (26), (27), (28)and dinaphtho/2,1-b:1',2'-d/furan derivative
(30) were detectedas products of twofold photochemical
dehydrocyclization.Dinaphtho/2,1-b:1',2'-d/furan derivative (31) was
prepared byonefold photochemical dehydrocyclization reaction from
styrylderivative of naphtho/2,1-b/furan (24),dinaphtho/2,1-b:1',2'-d/furan
derivative (32) was prepared byhydrolysis of dinaphtho/2,1-b:1',2'-d/furan
derivative (30). Thepresence
ofE-2-(2-carboxystyryl)naphtho/2,1-b/thiophene-5-methoxylate (23)or
E-2-(2-carboxystyryl)naphtho/2,1-b/furan-5-methoxylate (24)was not recorded
as the product of onefold photochemicaldehydrocyclization derived from
2,5-distyrylthiophene derivative(9) or 2,5-distyrylfuran derivative (10),
but they weresynthesized from (19) and (20) according to the schemes.
Themechanism of the twofold photochemical dehydrocyclizationreaction is
discussed.
Keywords: Twofold photochemical dehydrocyclization, 2,5-Distyrylthiophenes, 2,5-Distyrylfurans, Dinaphtho/2,1-b:1',2'-d/furanes, Dinaphtho/2,1-b:1',2'-d/thiophenes, E-2-(2-carboxystyryl)naphtho/2,1-b/furan-5-methoxylate, E-2-(2-carboxystyryl)naphtho/2,1-b/thiophene-5-methoxylate, Mechanism of twofold photochemical dehydrocyclization.
Title: Synthesis and Photochemistry of
4-Methylene-2-protoadamantanone
- Authors:
- Mlinarić-Majerski, Kata
- Pavlović, Dražen
- Šindler, Marija (47004)
Journal: Journal of Organic Chemistry
ISSN: 0022-3263
Volume: 58
Year: 1993
Pages: from 252 to 254
Number of references: 14
Language: engleski
Title: Photochemical Behaviour of 4-Methylene-2-adamantanone, An
Exocaclic beta,gama-Unsaturated Ketone
- Authors:
- Mlinarić-Majerski, Kata
- Pavlović, Dražen
- Veljković, Jelena
- Šindler, Marija (47004)
Journal: Croatica Chemica Acta
Number: 2
ISSN: 0011-1643
Volume: 66
Year: 1993
Pages: from 385 to 392
Number of references: 14
Language: engleski
Title: Molecular-mechanics Calculations of the Geometry and
Racemization Energies of An N-Aryl-2(1H)-quinolone and N-Aryl-4-pyridones
- Authors:
- Mintas, Mladen (31831)
- Raos, Nenad (82858)
- Mannschreck, Albrecht
Journal: Journal of Mathematical Chemistry
ISSN: 0259-9791
Volume: 8
Year: 1991
Pages: from 207 to 216
Number of references: 14
Language: engleski
Summary: The geometrics and energies of ground and possible
transitionstates of the quinolone (1) and pyridones (2)-(4) were
calculatedby the molecular-mechanichs method. The calculated
energydifference between ground and the lowest transition state are ingood
correlation (r=0.994) with the corresponding experimentalracemization
energies for interconversion of enantiomers in(1)-(4). However, tha
calculated potential energy differences donot correspond to measured
differences in Gibs energies. The factwas tentatively attributed to
neglection of the entropycontribution to Gibbs energies.
Title: 13C NMR Spectra of Some Symmetrically 2,2'-Disubstituted
Stilbenes: Conjugational and Conformatial Effects
- Authors:
- Vikić-Topić, Dražen (71183)
- Mintas, Mladen (31831)
- Raos, Nenad (82858)
Journal: Journal of Molecular Structure
ISSN: 0022-2860
Volume: 267
Year: 1992
Pages: from 405 to 410
Number of references: 8
Language: engleski
Summary: In the 13C NMR spectra of symmetrically
2,2'-disubstitutedcis-stilbenes the decrease in alpha-effects and
gamma-effects atortho-carbons with respect to trans-isomers were observed.
Themost significant differences in substituent effects were foundfor
gamma-effects, at substituted o-C6 and o-C4 atoms. The onebond C-H
splitting of olefinic carbons is greater in cis- than intrans-stilbenes.
The difference in substituent effects andapparent coupling constants are
assumed to originate mainly fromthe different conjugational interactions.
The conformational andconfigurational differences of these molecules were
substantiatedby molecular mechanics calculations.
Title: Enantiomers and Barriers to Racemization of Sterically
Hindered Aryl- and Heteroary-pyrroles
- Authors:
- Vojnović, Dragana
- Mintas, Mladen (31831)
- Kastner, Fritz
- Mannschreck, Albrecht
Journal: Journal of Heterocyclic Chemistry
ISSN: 0022-152X
Volume: 29
Year: 1992
Pages: from 327 to 333
Number of references: 33
Language: engleski
Summary: The N-aryl- and
N-heteroaryl-2,5-dimethylpyrrole-3-carbaldehydes(2-8) have been synthesized
by condensation of hexane-2,5-dionewith the appropriate amine and
subsequent Vilsmeier-Haackformylation of the pyrrole ring. Diastereomeric
associationcomplexes of the racemic pyrrole (8) were studied by pmr
chemicalshifts and the splittings induced
by(+)-1-(9-anthryl)-2,2,2-trifluoroethanol. Enrichment of theenantiomers M
and P of (2) and (6) was achieved by liquidchromatography on
triacethylcellulose. The barrier to partialrotation about the C-N bond in
(6) was determined by thermalracemization and its lower limits in (2) and
(8) were estimated.
Title: Regiospecific Synthesis and Structural Study of Some
Trifluoromethyl Substituted Dibenzosemibullvalene
- Authors:
- Otočan, Klaudio
- Mintas, Mladen (31831)
- Kastner, Fritz
- Mannschreck, Albrecht
- Golen, James A.
- Vojnović, Dragana
Journal: Monatshefte fuer Chemie
ISSN: 0026-9247
Volume: 123
Year: 1992
Pages: from 1193 to 1205
Number of references: 18
Language: engleski
Summary: Preparation of the regiospecifically trifluoromethyl
substituteddibenzosemibullvalenes 3 and 5 is described. An unequivocal
proofof chirality of 3 and 5 was obtained by enrichment of theirenantiomers
using liquid chromatography on triacetyl- ortribenzoylcellulose. The
stereostructure of compounds 3 to 5 wasproved by their 1H NMR spectra and
confirmed by X-raycrystallographic analysis. The geometrical data from
X-raystructural analyses showed that five-membered rings involved inthe
skeleton of 3 and 5 adopt flattened envelope conformations.These results
indicate also a significant substituent-inducedbond length asymmetry in the
cyclopropane rings of 3 and 5.
Title: Molecular Mechanics Calculations of The Geometry and
Racemization Energies of Sterically Hindered N-Aryl- and
Heteroaryl-pyrroles
- Authors:
- Raos, Nenad (82858)
- Mintas, Mladen (31831)
Journal: Croatica Chemica Acta
Number: 4
ISSN: 0011-1643
Volume: 65
Year: 1992
Pages: from 893 to 899
Number of references: 19
Language: engleski
Summary: The geometries and energies for ground and possible
transitionstates of sterically hindered N-arylpyrrole (1)
andN-heteroarylpyrroles (2) and (3) were studied by the molecularmechanics
method. The racemization energy and the most probabletransition state for
interconversion of enantiomers (P)-(M) in(1)-(3) were estimated from the
calculated energy differencebetween ground and the lowest transition state.
The calculatedpotential energy differences gave the order V(2)-V(3)-V(1)
whichis in accord with experimental findings and qualitativereasoning.
Title: Chiral Chromenes: Synthesis, Separation of Enantiomers and
Barriers to Racemization
- Authors:
- Lončar, Linda
- Otočan, Klaudio
- Mintas, Mladen (31831)
- Troetsch, Thomas
- Mannschreck, Albrecht
Journal: Croatica Chemica Acta
Number: 1
ISSN: 0011-1643
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
theappropriate lactone with diisobutylaluminium hydride andsubsequent
O-alkylation of the resulting lactols. Separation orenrichments of
enantiomers were achieved by liquid chromatographyon triacetylcellulose and
tribenzoylcellulose, (+)-3 and (-)-3being separated almost completely,
while an enrichment of theenantiomers of 4 was achieved by using the
recyclic procedure.The barriers for the interconversion of enantiomers of 3
and 4were determined by thermal racemization of enantiomers.
Title: Syntheses, Separation of Enantiomers and Barriers to
Racemization of Some Sterically Hindered
N-Aryl-1,2,3,4-tetrahydro-3,3,-dimethyl-2,4-quinoline Diones and Their
Thioanalogues
- Authors:
- Šarac-Arneri, Ruža (45996)
- Mintas, Mladen (31831)
- Pustet, Nicola
- Mannschreck, Albrecht
Journal: Monatshefte fuer Chemie
ISSN: 0026-9247
Year: 1994
Number of references: 19
Language: engleski
Summary: The
novelN-aryl-1,2,3,4-tetrahydro-3,3-dimethyl-2,4-quinolinediones (1),(4) and
(8) were thionated by the Lawesson reagent and byphosphorus pentasulphide
to yield the monothio derivatives (2)and (5) and the dithio compounds (3),
(6) and (9), respectively.Their enantiomers were separated by liquid
chromatography ontriacetyl- or tribenzoylcellulose. Rotation barriers for
(1-4)and (8) were determined by thermal racemization and discussed interms
of steric effects.
Title: Formylation of 2,5-Unsubstituted Oxazole: Preparation and
Characterization of 2- and 5-Formyl-4-methyloxazoles
- Authors:
- Šindler, Marija (47004)
- Vojnović, Dragana
- Defterdarović, Nafis (20285)
- Marinić, Željko (115246)
- Srzić, Dunja
Journal: Heterocycles
ISSN: 0385-5414
Volume: 38
Year: 1994
Pages: from 1791 to 1796
Language: engleski
Title: Solvent and Substituent Effects on The Absorption and
Fluorescent Properties of Substituted 2-Phenylbenzothiazoles and Their
Vinylogues
- Authors:
- Tralić-Kulenović, Vesna
- Fišer-Jakić, Lelja (12062)
Journal: Spectrochimica Acta, Part A
ISSN: 0584-8539
Volume: 51
Year: 1995
Pages: from 00000 to 00000
Language: engleski
Summary: Absorption and emission spectra of substituted
2-phenylbenzothiazoles and substituted 2-styrylbenzothiazoles have been
studied in different solvents at room temperature. It was found that both,
the kind of substituent and the solvent polarity influenced the changes of
the spectral properties. The ethylenic double bond between the aryl and
benzothiazolyl moiety exhibits a batochromic shift of the main absorption
maxima for 25-44 nm and the fluorescence maxima for 37-105 nm. With the
increasing of solvent polarity the Stokes' shifts become larger.
Substituted 2-phenylbezothiazoles exhibit higher relative fluorescence
quantom efficiency than their vinylogues and the substituent effect on the
quantum efficiency in phenyl series is more remarkable.
Title: Furfuryl-aryl Amines: Synthesis and Their Characterization
- Authors:
- Mance, Ana-Dunja (27915)
- Jakopčić, Krešimir (17793)
- Šindler, Marija (47004)
Journal: Synthetic Communication
ISSN: 0039-7911
Volume: 25
Year: 1995
Pages: from 00000 to 00000
Number of references: 12
Language: engleski
Summary: Reaction of several
N-(5-substituted-2-furfuryl)-p-toluidines with the appropriate substituted
allyl bromide gave new examples of tertiary amines (3a-e, 4a-e) with unique
capability to react spontaneously in a sense of intramolecular
/4+2/cycloaddition (IMDA) reaction.
Keywords: Substituted alkenyl-furfuryl-aryl-amines, Intramolecular Diels-Alder reaction, IMDA reaction, Secondary amines, Tertiary amines, Furan, Alkyl exchange.
Title: Synthesis and Photochemistry of 2-Styrylpyrroles.
Intermolecular Photoaddition of Pyrroles to a Double Bond
- Authors:
- Šindler, Marija (47004)
- Špoljarić-Lukačić, Lidija (184223)
- Marinić, Željko (115246)
- Metelko, Biserka (52362)
Journal: Recueil des Travaux Chimiques des Pays-Bas
ISSN: 0165-0513
Year: 1995
Pages: from 00000 to 00000
Language: engleski
Title: Absorption and Fluorescent Properties of Some New
Substituted 2-Furylbenzothiazoles and Their Vinylogues
- Authors:
- Tralić-Kulenović, Vesna (24515)
- Fišer-Jakić, Lelja (12062)
Journal: Croatica Chemica Acta (Reviewed)
ISSN: 0011-1643
Language: engleski
Summary: Absorption and fluorescence emission spectra of six
substituted 2-(2-furyl)benzothiazoles and their vinylogues have been
studied in different solvents at room temperature. It was found that both,
the kind of the substituent and the solvent polarity influenced the changes
of the spectral properties. The ethylenic double bond between the furyl and
benzothiazolyl moiety exhibits a bathochromic shift of the longwave
absorption maxima for 10-37 nm as well as bathochromic shift of the
fluorescence maxima for 40-65 nm. For substituted 2-(2-furyl)benzothiazoles
a linear relationship of solvent polarity against Stokes' shifts and
fluorescence sensitivity was observed. This group of compounds exhibits
higher relative fluorescence quantum efficiency than their vinylogues. The
mostly fluorescent compounds among them is
2-(5-phenyl-2-furyl)benzothiazole.
Title: Acid-catalysed Rearrangement of
Tetracyclo/4.3.0.0(2,9).0(4,8)/nonane Skeleton to Substituted Brendene
Derivatives
- Authors:
- Mlinarić-Majerski, Kata
- Kragol, Goran
- Šindler, Marija (47004)
- Pavlović, Dražen
Journal: Liebig's Annalen der Chemie
Volume: 0000
Year: 1995
Pages: from 00000 to 00000
Number of references: 20
Language: engleski
Summary: The synthesis of 2-exo-substituted brendene derivatives
4-7b as well as 2,5-disubstituted brendene derivatives 7c and 8 is
described, starting from the readily available
tetracyclo/4.3.0.0(2,9).0(4,8)/nonanone 1. The cationic and anionic
rearrangement reactions of tetracyclic skeleton of 1,2, and 3 have been
studied. The mechanism of these reactions is discussed.
The preparation of hitherto unknown exo-alcohol 2a by reduction of ketone 1
is presented.
Information: svibor@znanost.hr