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

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.


MZT Croatian language SVIBOR Alphabetic list Sorted on project code Sorted on institutions Search help
Ministry of
Science and
Technology
Croatian
language
Svibor
homepage
Alphabetic
list
Sorted on
project code
Sorted on
institutions
Search Help

Information: svibor@znanost.hr