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  • Inorganic Chemistry  (315)
  • 1990-1994  (195)
  • 1970-1974  (120)
  • 11
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 332-338 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Hydrogenation of Δ2-5-IsoxazolonesThe Δ2-5-isoxazolones 1, 5, 8a-c, and 11a, b are opened under conditions of the catalytic reduction to yield β-enamino-β'-ketocarboxylic acids 6a, b. In a second step, the derivatives 8a-c, 11a, b form diazepines 10a-c and pyrazoles 12, 13 by intramolecular cyclization. The structures are elucidated on the basis of the n.m.r. and i.r. spectra.
    Notes: Die Δ2-5-Isoxazolone 1, 5, 8a-c und 11a, b werden bei der katalytischen Hydrierung unter reduktiver Ringöffnung zu β-Enamino-β'-ketocarbonsäuren 6a, b gespalten Dabei cyclisieren die Derivate 8a-c, 11a, b intramolekular zu den Diazepinen 10a-c und Pyrazolen 12, 13. Die Strukturen werden durch NMR- und IR-Spektren bewiesen.
    Additional Material: 3 Tab.
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  • 12
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 1-7 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On a [3 + 1] Cycloaddition, II. Reactions of 4,5-Dihydro-1,3,5-oxazaphosph(V)olen, VI4,5-Dihydro-1,3,5-oxazaphosph(V)oles 1 react with isonitriles to yield disubstituted 3-imino-4,4-bis(trifluoromethyl)-1-azetines 2 with elimination of phosphoric acid esters. The reaction should proceed via nitrile ylides.
    Notes: 4,5-Dihydro-1,3,5-oxazaphosph(V)ole 1 reagieren mit Isonitrilen zu disubstituierten 3-Imino-4,4-bis(trifluormethyl)-1-azetinen 2 unter Ehmmierung von Phosphorsäureester Eine Nitrilylid-Zwischenstufe wird angenommen.
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  • 13
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 1730-1735 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Chalcogen Compounds. The Monooxotrithiotungstate Anion WOS3)2]2- as Bidentate Ligand in Transition Metal ComplexesThe preparation, properties, magnetic moments and structure of the new ions [Ni(WOS3)2]2-, [Co(WOS3)2]2- and [Zn(WOS3)2]2- are reported. From the interpretation of the i. r. and electronic spectra follows that only sulphur atoms are coordinating.
    Notes: Es wird über die Darstellung, Eigenschaften, magnetischen Momente und Struktur der Ionen [Ni(WOS3)2]2-, [Co(WOS3)2]2- und [Zn(WOS3)2]2- berichtet. Die Deutung der IR- und Elektronenspektren ergibt in allen Fällen eine Koordinierung über Schwefel.
    Additional Material: 2 Ill.
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  • 14
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 1875-1886 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Mechanism of the Wolff RearrangementThe thermal and electron impact induced Wolff rearrangement of [carbonyl-13C]azibenzil (6) occurs without migration of the labelling. In contrast in the photochemically performed reaction a part of the label is found in the tertiary carbon atom of the resulting diphenylacetic acid, which proves the formation of an oxirene intermediate. The amount of the oxirene is smaller when the water concentration is increased. The participation of the oxirene intermediate is discussed on the basis of two alternative reaction mechanisms.
    Notes: Bei der thermischen und elektronenstoß-induzierten Wolff-Umlagerung von [Carbonyl-13C]-Azibenzil (6) bleibt die Markierung in der Carbonylgruppe fixiert. Im Gegensatz dazu gelangt im photochemischen Fall ein Teil der Markierung in das tertiäre C-Atom der resultierenden Diphenylessigsäure, wodurch der Weg über ein Oxiren bewiesen wird. Dieser Anteil nimmt bei höherer Wasserkonzentration ab. Das Auftreten der symmetrischen Oxiren-Zwischenstufe wird an Hand von zwei alternativen Reaktionsmechanismen diskutiert.
    Additional Material: 2 Ill.
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  • 15
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 1643-1647 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diyne Reaction, XIX. Polarographic Studies of Acenquinones and HeteroacenquinonesThe polarographic behavior of several new acenquinones and heteroacenquinones in acetonitrile is studied. For all quinones studied, two one-electron reduction steps are observed. For substituted anthraquinones a linear dependence is found between the halve-wave potentials of the first reduction step and the summation of Hammett substituent constants. Heteroatoms shift the halve-wave potentials in the negative direction.
    Notes: Das polarographische Verhalten einiger neuer Acenchinone und Heteroacenchinone in Acetonitril als Lösungsmittel wird untersucht. Bei allen untersuchten Chinonen werden zwei Ein-Elektronenübergänge beobachtet. Zwischen den Halbstufenpotentialen der ersten Stufe und der Summe der Hammettschen Substituentenkonstanten besteht bei substituierten Anthrachinonen eine lineare Beziehung. Die Heteroatome bewirken eine Verschiebung der Halbstufenpotentiale zu negativeren Werten.
    Additional Material: 1 Ill.
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  • 16
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3601-3607 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Chalcogen Compounds, About Dibenzyldithioarsinato-, Dibenzylmonothioarsinato-, and Diphenylmonothioarsinato ComplexesThe preparation and properties of the chelate complexes of the dibenzyldithioarsinate ion with CoII, NiII, and CdII, of the dibenzylmonothioarsinate ion with CoII and ZnII, and of the diphenylmonothioarsinate ion with CoII, ZnII, and CdII are reported. The structure of these transition metal complexes can be determined from electronic spectra and magnetic measurements. The position of the ligands in the spectrochemical and nephelauxetic series is given. The acids H[Ph2As(O)S], H[Bzl2As(O)S], and H[Bzl2AsS2] were reported for the first time.
    Notes: Darstellung und Eigenschaften der Chelatkomplexe des Dibenzyldithioarsinat-Ions mit CoII, NiII und CdII, des Dibenzylmonothioarsinat-Ions mit CoII und ZnII und des Diphenylmonothioarsinat-Ions mit CoII, ZnII und CdII werden beschrieben. Aus Elektronenabsorptionsspektren und magnetischen Messungen kann die Struktur dieser Übergangsmetallkomplexe abgeleitet werden. Die Liganden werden in die spektrochemische und nephelauxetische Reihe eingeordnet. Es wird erstmals über die Säuren H[Ph2As(O)S], H[Bzl2As(O)S] und H[Bzl2AsS2] berichtet.
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  • 17
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 929-936 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heterocyclizations, XIII. New Polycyclic Pyrimidines with Bridge-Head NitrogenThe base-catalized condensation of 2,3,3-trimethyl-3H-benz[f]indole (9) with dielectrophilic iso(thio)cyanates to polycyclic pyrimidines with bridge-head nitrogen (11, 15, 16) in most cases involves preliminary formation of 1: 2 adducts followed by elimination of diacylamides. Contrary to this the less nucleophilic 2,3,3-trimethyl-3H-pyrrolo [2,3-b]pyridine (20) affords the analogue pyrimidines by intermediacy of 1:1 adducts and elimination of water or ethanol solely.
    Notes: Die basenkatalysierte Kondensation von 2,3,3-Trimethyl-3H-benz[f] indol (9) mit dielektrophilen Iso(thio)cyanaten zu polycyclischen Pyrimidinen mit Brückenkopf-Stickstoff (11, 15, 16) verläft meist über die Bildung von 1:2-Addukten als Zwischenstufe und Eliminierung von Diacylamiden. Dagegen liefert das weniger nucleophile 2,3,3-Trimethyl-3 H-pyrrolo[2.3-b]-pyridin (20) analoge Systeme (22, 23) ausschließlich über 1: 1-Addukte und Eliminierung von Wasser bzw. Äthanol.
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  • 18
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 3946-3956 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diyne Reaction, XXXII. Polarographic and I. R. Spectroscopic Investigations of 2H-Benzol[f]isoindole-4,9-quinonesThe influence of the substituents of multiply substituted 2H-benz[f]isoindole-4,9-quinones on the half wave potential of the first step is polarographically examined. A linear relationship between the sum of the constants of the substituents and the half wave potentials is found, if, instead of the Hammertt's σp-constants, the σ--values for the CHO- and CN-groups are used. The dependence of the i. r. spectroscopically determined bond order of the carbonyl groups on the effects of the substituents can be expressed with a quite satisfactory correlation between the carbonyl wave numbers and the Hammett's constants of the substituents.
    Notes: Polarographisch wird der Einfluß der Substituenten auf das Halbstufenpotential der ersten Stufe an mehrfach substituierten 2 H-Benz[f]isoindol-4,9-chinonen untersucht. Man findet eine lineare Beziehung zwischen der Summe der Substituentenkonstanten und den Halbstufenpotentialen, wenn man für die CHO- und CN-Gruppen an Stelle der Hammettschen σp-Konstanten die σ--Werte verwendet. Die Abhängigkeit der IR-spektroskopisch ermittelten Bindungsordnung der Carbonylgruppen von den Substituenteneffekten kann durch eine recht befriedigende Korrelation zwischen den Carbonylwellenzahlen und den Hammettschen Substituentenkonstanten ausgedrückt werden.
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  • 19
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metall Chalkogen Compounds. Preparation, Properties and X-Ray Study of Tetrathioperrhenates. Vibrational and Electronic Spectra, Normal Coordinate Analysis of the ReS4--IonThe preparation and properties of tetrathioperrhenates MI ReS4 (MI = (C6H5)4As, (C6H5)4P, (CH3)4N) are described. The measured vibrational- and electronic spectra are discussed in terms of the bond properties. For the ReS4- ion a normal coordinate treatment is reported. From X-ray studies it could be derived that the tetraphenylarsonium salt (a = 13.14 Å, c = 7.11 Å) and the tetraphenylphosphonium salt (a = 12.94 Å, c = 7.20 Å) are crystallising tetragonal with Z = 2 probably in the space group S42-I 4.
    Notes: Darstellung und Eigenschaften von Tetrathioperrhenaten MIReS4 (MI = (C6H5)4As,(C6H5)4P, (CH3)4N) werden beschrieben. Die gemessenen Schwingungs- und Elektronen-spektren werden gedeutet und im Zusammenhang mit den Bindungsverhältnissen diskutiert. Für das ReS-4 -Ion wird eine Normalkoordinatenanalyse durchgeführt. Die röntgenographische Untersuchung ergab, daß das Tetraphenylarsoniumsalz (a = 13.14 Å, c = 7.11 Å) und das Tetraphenylphosphoniumsalz (a = 12.94 Å, c = 7.20 Å) tetragonal mit Z = 2 wahrscheinlich in der Raumgruppe S42-I 4 kristallisieren.
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  • 20
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 3350-3352 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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