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  • Inorganic Chemistry  (11)
  • Organic Chemistry  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of Substituted 1,2-Dihydro-2-imino-7-methyl-1,6(6H)-naphthyridin-5-ones (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 1777-1781 
    Details
    ISSN: 0947-3440
    Keywords: 1,6-Naphthyridines ; 4-Aminopyridin-3-carbaldehydes ; Cyclizations ; Nitrogen heterocycles ; Antituberculosis agents ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Vilsmeier formylation of the 4-amino-2-pyridinones 4a-d leads to the formation of the corresponding 3-carbaldehydes 5a-d (the diformylated product 8 is isolated as a by-product). A cyclizing Knoevenagel reaction of 5 with CH-acidic nitriles 6 in the presence of piperidine gives substituted 2-imino-1,6(6H)-naphthyridin-5-ones 7a-p which have been shown by means of 1H-NMR and 1H-NOE measurements not to rearrange to 9. The products 7 are resistant against hydrolysis and only the ester group can be hydrolysed to an acid, 7q. Compounds 7c, d, f display in vitro antituberculosis activity.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199719970822
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  • 2
    Electronic Resource
    Electronic Resource
    New Polycyclic Compounds from Photochemical Rearrangements of Some Substituted 2-Azatricyclo[5.2.2.01,5]undeca-4,8,10-trien-3-ones (1991)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 74 (1991), S. 1011-1026 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The products formed on UV irradiation of several tricyclic compounds (i.e. 3, 6, 8, 15, and 17, Schemes 2-4) were studied in detail. A marked dependence of the reaction course on the type and site of substitution was found. Among the several light-induced transformations, a novel rearrangement, i.e. 11 to 9 (Scheme 3) was identified. The formation of the polycyclic compound 13 on irradiation of 8a (Scheme 3) resulted from an unexpected skeletal rearrangement with dearomatization of one benzene ring. The structures of compounds 10, 11, and 13 were established by X-ray crystallography (Figs. 1-3). An attempt was made to give a general mechanistic picture of all observed photochemical results (Schemes 4-6).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19910740512
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  • 3
    Electronic Resource
    Electronic Resource
    Cycloaddition of Carbodiimides with a Heteroaromatic Substituent to Allenic Acids (1992)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 75 (1992), S. 1262-1266 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cycloaddition of the allenic acid 3 with the N -cyclohexyl-N′ -heteroaromatic carbodiimides 2a and 2b gave the isomeric pyrido[1,2-a]pyrimidinones 4 and 5 and thiazolo[3,2-a]pyrimidinones 6 and 7, respectively, instead of the expected Diels-Alder adducts analogous to 1. The compounds of the latter type, i.e. 8 and 9, were formed from 3 and carbodiimides 2c and 2d, respectively, containing an N′-(pyrazin-2-yl) or N′-(pyrimidin-2-yl) substituent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19920750426
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  • 4
    Electronic Resource
    Electronic Resource
    A Regiospecific Photochemical Rearrangement of 2-Azabenzotricyclo[5.2.2.01,5]- to 2-Azabenzotricyclo[6.2.1.01,5]undecatrienone (1989)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 72 (1989), S. 502-506 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 2-azatricyclo[5.2.2.01,5]undeca-4,8,10-trien-3-ones 1a and 1b gave on irradiation the 2-azatricyclo-[6.2.1.01,5]undeca-4,6,9-trien-3-ones 2a and 2b, respectively. The rearrangement was found to be solvent-, oxygen-, and wavelength-independant.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19890720313
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  • 5
    Electronic Resource
    Electronic Resource
    Darstellung und Eigenschaften von 1-Norbornylkupfer (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 510 (1984), S. 7-10 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Properties of 1-Norbornyl Copper1-Norbornyl copper was synthesized from copper(II) acetylacetonate and 1-norbornyl lithium. The compound shows an unexpected stability and decomposes only at ca. 80°C with precipitation of copper and formation of norbornyl radicals which were proved by spin-trap experiments. A further characterization was performed by the IR and 13C-NMR spectra.
    Notes: 1-Norbornylkupfer1-Norbornyl (1-Nor) = Bicyclo-(2.2.1)-heptyl wurde aus Kupfer(II)-acetylacetonat und 1-Norbornyllithium dargestellt. Die Verbindung ist unerwartet stabil und zersetzt sich erst bei etwa 80°C unter Abscheidung von Kupfer und Bildung von Norbornylradikalen, die durch Spintrapping-Experimente nachgewiesen wurden. Eine nähere Charakterisierung erfolgte mittels des IR- und 13C-NMR-Spektrums.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845100302
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  • 6
    Electronic Resource
    Electronic Resource
    Koordinationschemische Untersuchungen an Zinkdialkylen. XVII [1]. Bis(3-nortricyclyl)zink und dessen komplexchemisches Verhalten (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 494 (1982), S. 139-143 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on the Coordination Chemistry of Zinc Dialkyls. XVII. Bis(3-nortricyclyl)-zinc and its Bipyridyl ComplexesBis(3-nortricyclyl)zink was synthesized from zinc chloride and 3-nortricyclyl magnesium chloride and characterized by means of the mass, IR- and 13C-NMR spectra and the course of the thermal decomposition. The compound forms with bipyridyl a complex of the formula (3-NTC)2Zn · bipy and unexpectively another complex of the composition [(3-NTC)2Zn]2 · bipy.
    Notes: Bis(3-notricyclyl)zink1 wurde aus Zinkchlorid und 3-Nortricyclylmagnesiumchlorid synthetisiert. Eine nähere Charakterisierung erfolgte durch Aufnahme und Auswertung der Massen-, IR- und 13C-NMR-Spektren sowie durch Untersuchung des thermischen Zerfalls. Die Verbindung bildet mit 2,2′-Dipyridyl einen Komplex der Formel (3-NTC)2Zn · dipy und unerwartet auch einen solchen der Zusammensetzung [(3-NTC)2Zn]2 · dipy.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824940118
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  • 7
    Electronic Resource
    Electronic Resource
    Darstellung und Eigenschaften von Trinorbornylbor-Verbindungen (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 494 (1982), S. 144-150 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Properties of Trinorbornyl Boron CompoundsTris(1-norbornyl), Tris(2-norbornyl), and Tris(7-norbornyl) boron were synthesized from boron trifluoride diethylether and 1-norbornyl lithium or 2- and 7-norbornyl magnesium halides respectively. The compounds were characterized by the IR-, 13C-, 11B-NMR, and mass spectra. Furthermore 1-norbornyl lithium was isolated in the crystalline state and investigated in detail.
    Notes: Tris(1-norbornyl)-, Tris(2-norbornyl)- und Tris(7-norbornyl)bor1 wurden aus Bortrifluorid-diethylether und 1-Norbornyllithium bzw. 2- und 7-Norbornylmagnesiumhalogeniden synthetisiert. Eine nähere Charakterisierung erfolgte durch IR-, 13C- und 11B-NMR- sowie Massenspektren. 1-Norbornyllithium wurde in kristalliner Form erhalten; die Verbindung liegt in Benzol tetramer vor. Das 13C-NMR-Spektrum wird angegeben.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824940119
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  • 8
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. XXVIII. Zur Benzylierung der Acetylacetonate des dreiwertigen Titans, Vanadiums und Chroms (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 447 (1978), S. 136-142 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contribution to the Chemistry of Transition Metal Alkyl Compounds. XXVIII. Benzylation of the Trivalent Titanium, Vanadium, and Chromium AcetylacetonatesBzCr(acac)2, 2Bz(Vacac)2 · Mg(acac)2 and 3BzV(acac)2 · Al(acac)3 were obtained in definite form by reaction of Cr(acac)3 and V(acac)3 with Bz3Al, Bz2Mg, and BzMgCl. Ti(acac)3, reacts with Bz2Mg and BzLi forming deep green Bz3Ti, which could'nt be isolated free of impurities (Bz = C6H5CH2, acacH = acetylacetone).
    Notes: Bei Reaktionen von Cr (acac)3 und V(acac)3 mit Bz3Al, Bz2Mg und BzMgCl wurden als definierte Verbindungen BzCr(acac)2, 2BzV(acac)2 · Mg(acac)2 und 3BzV(acac)2, Al(acac)3 erhalten. Aus Ti(acac)3 und Bz2Mg bzw. BzLi entsteht tiefgrünes Bz3Ti, das jedoch nicht frei von Verunreinigungen erhalten werden konnte. (Bz = C6H5CH2, acacH = Acetylaceton).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784470114
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  • 9
    Electronic Resource
    Electronic Resource
    Structure of Glasses of the TeO2 - MoO3 System (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 479 (1981), S. 229-240 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Struktur der Gläser des TeO2-MoO3-SystemsEs werden Strukturmodelle für TeO2-MoO3-Gläser vorgeschlagen. Auf Grund von Röntgen- und IR-Untersuchungen wird durch Vergleich mit den bekannten kristallinen Strukturen von TeO2, MoO3 und Te2MoO7 (T2M) gezeigt, daß die Gläser von TeO2 bis Te2MoO7 [TeO4]- und [MoO5]-Gruppen als Grundstruktureinheiten besitzen. Die letzteren sind unter Bildung von [Mo2O8]-Komplexen verbunden. Die Gläser im MoO3-reichen Gebiet werden von [TeO3]- und [MoO6]-Polyedern aufgebaut. Die Glasbildungstendenz wird in Beziehung zur Rolle des freien Elektronenpaars und zur Spaltung von sekundären und schwachen primären Bindungen in den Kristallen diskutiert.
    Notes: Structural models for glasses of the TeO2-MoO3 system are suggested. On the basis of X-ray and infrared spectral investigations, by comparing with known crystalline structures of TeO2, MoO3 and Te2MoO7(T2M), it is shown that the glasses from TeO2 to Te2MoO7 possess [TeO4] and [MoO5] groups as basic structural units. The latter are connected to form [Mo2O8] complexes. The glasses in the MoO3-rich compositional range are built up of [TeO3] and [MoO6] polyhedra. The glass-formation tendency is discussed in relation to the role of the free electron pair and the disruption of secondary and weak primary bonds in the crystals.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814790828
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  • 10
    Electronic Resource
    Electronic Resource
    Experimentelle Untersuchungen zum Wolframtransport in fluorhaltigen Systemen (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 547 (1987), S. 216-224 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Experimental Investigations on the Tungsten Transport in Systems Containing Fluorine CompoundsInformation on the chemical processes in tungsten incandescent lamps containing gaseous fluorides are obtained by i.r. and u.v. spectroscopic and mass spectrometric analysis of the gasphase as well as by investigating the deposits at the wall and the changes at the filament. Due to the involvement of the wall in the reaction fluorine carrier gases are converted irreversibly into SiF4 which also maintains the chemical tungsten transport. In systems containing fluorine and bromine silicon bromide fluorides are formed.
    Notes: Durch die IR- und UV-spektroskopische sowie massenspektrometrische Analyse der Gasphase sowie die Untersuchung gebildeter Beläge und der Veränderungen am Glühkörper werden Aussagen über die chemischen Vorgänge in Wolframlampen mit fluorhaltigen Füllgasen erhalten. Fluorträgergase werden in der brennenden Lampe durch die Einbeziehung der Wand in das Reaktionsgeschehen irreversibel in SiF4 umgewandelt, das selbst transportaktiv ist. In Fluor und Brom enthaltenden Systemen werden Siliciumbromidfluoride, SiBr4-xFx, gebildet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19875470425
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