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  • 1
    ISSN: 0009-2940
    Keywords: Tetracarbonyl(norbornadiene)molybdenum(0) ; Oxidative addition of I2 ; Dihalogeno(bipyridyl)molybdenum(II) complexes ; 7-Coordinated complexes ; Neutral and cationic molybdenum(II) complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of [Mo(CO)4(C7H8)] (1) with I2 gave the norbornadienemolybdenum(II) complex [Mo(CO)2(C7H8)I2]n≥1 (2), which existed in an equilibrium of two isomeric forms. In acetonitrile, 2 reversibly formed the adduct [Mo(CO)2-(C7H8)(NCCH3)I2] (3), whereas on treatment with 2,2′-bipyridine or 4,4′-di-2,2′-tBu-bipyridine, it gave stable 7-coordinated molybdenum(II) complexes, [Mo(CO)(C7H8)-(C10H8N2)I2] (4) and [Mo(CO)(C7H8)(C10H6tBu2N2)I2] (5), in good yield. In similar reactions, the related dibromomolybdenum compounds [Mo(CO)(C7H8)(C10H8N2)Br2] (6) and [Mo-(CO)(C7H8)(C10H6tBu2N2)Br2] (7) were prepared by oxidation of 1 with two equivalents of CuBr2. The X-ray structural analysis of 6 reveals that the geometry around the molybdenum atom is nearly perfectly pentagonal bipyramidal, with the CO and one of the bipyridyl rings perpendicular to the plane formed by the other ligands. The compounds 5 and 6 react with AgSbF6 by halogen abstraction to give cationic complexes, {[Mo(CO)(C7H8)(C10H8N2)Br]SbF6}n≥1 (8) and {[Mo(CO)(C7H8)(C10H6tBu2N2)I]SbF6}n≥1 (9): In acetone, 8 and 9 reversibly formed the adducts [Mo(CO)(C7H8)(C10H8N2)(acetone)Br]SbF6 (8′) and [Mo(CO)(C7H8)(C10H6tBu2N2)(acetone)I]SbF6 (9′); while on treatment with PMe3, the stable monomeric complexes, [Mo(CO)(C7H8)(C10H8N2)(PMe3)Br]SbF6 (10) and [Mo(CO)(C7H8)(C10H6tBu2N2)(PMe3)I]SbF6 (11), were isolated in almost quantitative yield. In the presence of KBr, compound 8′ reverted to the dibromo complex 6, whereas 9′ reacted to produce a 1:1:2 mixture of 5, 7 and the bromo(iodo) complex [Mo(CO)(C7H8)(C10H6tBu2N2)BrI] (12). The same mixture is available from the reaction of 5 with one equivalent of 7.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 703-709 
    ISSN: 0009-2940
    Keywords: Copolymers ; Electrical conductivity ; Azo compounds ; Tellurides, organo ; Telluration ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Previously unknown alt-copoly(telluro-1,4-phenylene/azo-1,4-phenylene) and related polymers were synthesized by several different approaches, which include a) reductive polymerization of bis(4-nitrophenyl) tellurides with zinc; b) oxidative polymerization of bis(4-aminophenyl) telluride using a CuI/CuII redox system as catalyst under oxygen; c) electrochemical polymerization of bis(4-amino-3,5-dimethylphenyl) telluride; d) condensation polymerization of 1,4-dinitrosobenzene with bis(4-aminophenyl) telluride Te, Te-dichloride, and e) condensation polymerization of bis(4-nitrophenyl) telluride with bis(4-aminophenyl) telluride in the presence of sodium hydroxide. The polymers obtained were characterized by elemental analysis, 13C-CPMAS NMR, IR and UV-vis spectroscopy, GPC, and inherent viscosity measurements, and their properties were examined, particularly their electrical conductivity. The electrical conductivities of the new polymers 9b c, and 10 were shown to increase from below 10-7 up to 10-5 ∽ 10-2 S cm-1 upon bromine doping in spite of their formally interrupted conjugation structure.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 3782-3800 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese von Hexacyclo[5.4.1.02,6.03,10.04,8.09,12]dodecan-5,11-dion und seine Umwandlung in Di-, Tri- und Tetranitro-1,3-bishomoprismaneSulfenylierung des Dianions von Dimethyl-tetracyclo[7.2.1.04,11.06,10]dodeca-2,7-dien-5,12-dicarboxylat (9) mit Dimethyldisulfid ergab das exo,exo-Bis(methylthio)-Derivat 10a. Nachfolgende Hydrolyse und oxidative Decarboxylierung führte zu Tetracyclo[7.2.1.04,11.06,10]-dodeca-2,7-dien-5,12-dion (4), ein wichtiges Zwischenprodukt. Es wurde in das Bisketal 11 übergeführt und dieses zum doppelt funktionalisierten 1,3-Bishomopentaprismen 12 photolysiert. Nachfolgende saure Hydrolyse ergab die Titelverbindung 5, woraus drei Dinitro-(14 - 16), zwei Trinitro- (20, 21) und ein Tetranitro-Derivat (22) erhalten wurden. Die Konfigurationszuordnung der ersten vier Produkte erfolgte 1H-NMR-spektroskopisch und durch Röntgenstrukturanalyse von 21. Die Stereochemie der Nitro-substituierten Käfigmoleküle wird aufgrund ihrer Bildung und ihrer Dichte diskutiert, die in vielen Fällen erhöht ist. Auch von Tetranitro-bishomopentaprisman 22 wurden die strukturellen Eigenschaften durch eine Röntgenstrukturanalyse erhellt.
    Notes: Sulfenylation of the dianion of dimethyl tetracyclo[7.2.1.04,11.06,10]dodeca-2,7-diene-5,12-dicarboxylate (9) with dimethyl disulfide delivered the exo,exo-bis(methylthio) derivative 10a. Subsequent saponification and oxidative decarboxylation resulted in transformation to tetracyclo[7.2.1.04,11.06,10]dodeca-2,7-diene-5,12-dione (4). Upon photolysis of the bisketal 11 of this pivotal intermediate, arrival at the doubly functionalized 1,3-bishomopentaprismane 12 was achieved. Following acidic hydrolysis to give the title compound 5, elaboration of three dinitro (14 - 16), two trinitro (20, 21), and a tetranitro derivative (22) was accomplished. The configurational assignment to the first four products was achieved by means of 1H NMR spectroscopy and an X-ray crystal structure analysis of 21. The stereochemistries of the nitro-substituted cage molecules are discussed in terms of the mechanism of their formation and their densities, many of which are markedly enhanced. The structural features of the tetranitro-bishomopentaprismane 22 have also been elucidated by X-ray methods.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 783-785 
    ISSN: 0009-2940
    Keywords: Tellurides, organo ; Substitution, aromatic ; Tellurium-copper couple ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Te-Cu couple generated in situ by the reaction of disodium telluride with copper(I) iodide in dry N-methyl-2-pyrrolidone has been found to be a convenient telluration reagent for some activated iodoarenes 1. Using this reagent system, we have prepared by a one-pot synthesis in satisfactory yields several bis(nitroaryl) tellurides 4, which are otherwise laborious to obtain.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ein neuer, durch das Fehlen des Ferments Katalase im Blut gekennzeichneter Typus einer Konstitutionsanomalie des Menschen wurde zuerst von Takahara und alsdann von Yoshiya aufgefunden. Unsere Untersuchungen ergaben, Daß bei dieser Anomalie, für die wir die Bezeichnung „Anenzymia catalasea“ vorschlagen, die Katalase nicht nur im Blut, sondern auch in den Geweben fehlt. Die Anomalie steht in engem Zusammenhang mit einer Erkrankung des Stützgewebes der Zähne, die vorläufig als „Takaharasche Krankheit“ bezeichnet werden soll. Die mit der Anomalie behafteten Personen sind aber im übrigen gesund und leiden an keiner Stoffwechselstörung, was physiologisch und fermentchemisch von großem Interesse ist. Angesichts der Tatsache, daß die Katalase im normalen Stoffwechsel des menschlichen Organismus offenbar entbehrlich ist, wird das. alte Problem der physiologischen Funktion der Katalase erneut diskutiert. Es wird ferner versucht, eine Erklärung für die Pathogenese der Takaharaschen Krankheit zu finden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 71 (1938), S. 145-152 
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 48 (1915), S. 1597-1603 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 46 (1913), S. 4080-4088 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 46 (1913), S. 4089-4095 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 71 (1938), S. 1755-1762 
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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