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  • Inorganic Chemistry  (7)
  • Wiley-Blackwell  (7)
  • EDP Sciences
  • Public Library of Science
  • Wiley
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 2534-2544 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Derivatives of Methylenedioxybenzene, 34. On the Preparation of Dimethoxy(methylenedioxy)benzenedicarboxylic AcidsThe preparation of 5.6-dimethoxy-3.4-methylenedioxyphthalic acid (B), 5.6-dimethoxy-2.3-methylenedioxyterephthalic acid (C), 2.6-dimethoxy-4.5-methylenedioxyisophthalic acid (D), and derivatives of 3.6-dimethoxy-4.5-methylenedioxyphthalic acid (A) is described.
    Notes: Die Darstellung der 5.6-Dimethoxy-3.4-methylendioxy-phthalsäure (B), 5.6-Dimethoxy-2.3-methylendioxy-terephthalsäure (C) sowie 2.6-Dimethoxy-4.5-methylendioxy-isophthalsäure (D) und von 3.6-Dimethoxy-4.5-methylendioxy-phthalsäure(A)-Derivaten wird beschrieben.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 1058-1070 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Regioselective Addition of Grignard Reagents to 3-Methoxy- and 3-Nitrophthalic AnhydrideThe regioselectivity in the addition of the grignard reagents 5a and 6a to the anhydrides 1 and 2 is determined by the solvent system: in a highly selective manner (3: 97), the meta carbonyl group is attacked in tetrahydrofuran/tetramethylethylenediamine, while predominant, but relatively unselective (maximum 78:22) addition to the ortho carbonyl group is observed in diethyl ether. The influence of the solvent system on the regioselectivity is discussed. The LUMO-coefficients of the carbonyl carbon atoms in 1 and 2 were calculated.
    Notes: Die Addition der Grignard-Reagenzien 5a und 6a an die Anhydride 1 und 2 wird entscheidend vom Reaktionsmedium beeinflußt: in Tetrathydrofuran/Tetramethylethylendiamin wird hochselektiv (3: 97) die meta-ständige, in Diethylether dagegen überwiegend, aber mit nur geringer Selektivität (maximal 78: 22), die ortho-Carbonylgruppe angegriffen. Die Strukturen der dabei erhaltenen Addukte werden durch Umwandlung in die Ester 7-10, in die Lactone 11 sowie in die Ketone 12 und 13 bewiesen. Im Zusammenhang mit dem Versuch, die lösungsmittelabhängige Regioselektivität zu interpretieren, wurden die LUMO-Koeffizienten der Carbonylkohlenstoff-atome in 1 und 2 berechnet.
    Additional Material: 3 Tab.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 1725-1730 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaktion von Trialkylorthoformaten mit den Aluminium-Derivaten einiger α-ungesättigter Bromide. Darstellung von β-ungesättigten AcetalenDie Aluminium-Derivate 2, 4 und 7 α-ungesättigter Bromide, dargestellt in Ether, sind sehr reaktionsfähig gegenüber Trialkylorthoformaten. Mit Hilfe dieser Reaktion, durchgeführt bei -80°C, können auf einfache Weise β-ungesättigte Acetale 3, 5 bzw. 8 dargestellt werden.
    Additional Material: 2 Tab.
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  • 4
    ISSN: 0009-2940
    Keywords: Alkoxopalladium(II) ; Conformational analysis ; Hydrogen bonding ; Two-dimensional and cage structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of palladium acetate with two equivalents of di- and triethanolamines RN(CH2CH2OH)2 in the presence of a base affords the new chelate-stabilized alkoxo Pd(II) complexes [Pd(OCH2CH2N(R)CH2CH2OH)2] [R = Me (1), Et (2), n-Bu (3), benzyl (4) or CH2CH2OH (5)]. These N,O-ligated complexes are isolated in high yield as yellow, crystalline solids and are thermally stable despite the presence of several β-hydrogen atoms in the ligand system. Both complexes possess a square-planar palladium coordination geometry with the two oxygen atoms positioned mutually trans. The most notable difference in the molecular structures is that 1 forms a two dimensional network of intermolecular O-H≡O hydrogen bonds, whereas 5 forms intramolecular O-H⃛O hydrogen bonds, which cage the palladium center. In solution 1-4 exist as a diastereoisomeric mixture (a racemic enantiomeric pair SNSN, RNRN and a mesomeric form RNSN) in a 1:1 molar ratio, and this ratio is independent of temperature in nonalcoholic solvents, When complexes 1-4 are dissolved in protic solvents (e.g. MeOH) the diastereomeric excess is temperature-dependent due to an exchange process between the meso diastereoisomer and the (racemic) enantiomeric pair. Thermodynamic parameters for this process in a mixture of MeOH-toluene have been determined with NMR and show this process to be influenced by the steric nature of the alkyl substituent (R) on nitrogen. A conformational analysis based on 1H-NMR coupling constants within the N,O-chelate ring of complexes 1-4 provides details on the solution structure of the ring in both diastereoisomers.
    Additional Material: 9 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1088-1094 
    ISSN: 0044-2313
    Keywords: Complex copper(II) fluorides ; ternary system BaF2—CuF2—ScF3 ; phase diagram ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Komplexe Kupfer(II)-fluoride. XV. Das ternäre System BaF2—CuF2—ScF3Das fest-flüssig Phasendiagramm des binären Systems BaF2—ScF3 wird mittels DTA- und röntgenographischer Daten bestimmt. Das System enthält drei Fluoride: Ba3Sc2F12, Ba5Sc3F19 und eine kubische Hochtemperaturphase Ba1-xScxF2+x (x = 0,17), deren Struktur sich von BaF2 ableitet. Eine feste Lösung zwischen BaF2 und ScF3 wird bei hoher Temperatur nachgewiesen. Das ternäre System BaF2—CuF2—ScF3 wird röntgenographisch untersucht und ein isothermaler Schnitt bei 670°C wiedergegeben. Es zeigt sich die Existenz von vier Phasen: Ein komplexes quaternäres Fluorid Ba10Cu12ScF47, zwei polytype Phasen, deren Strukturen sich von BaCuF4 ableiten und eine tetragonale feste Lösung Ba5Sc3-xCuxF19-x mit 0 ≤ x ≤ 1.
    Notes: The liquid-solid phase diagram of the binary system BaF2—ScF3 is established by D.T.A. and radiocrystallography. Three fluorides are disclosed: Ba3Sc2F12, Ba5Sc3F19 and a cubic high temperature phase Ba1-xScxF2+x (x = 0.17), the structure of which derives from that of BaF2. A solid solution between BaF2 and ScF3 is also evidenced at high temperature. The ternary system BaF2—CuF2—ScF3 is investigated by radiocrystallography and an isothermal section at 670°C is given. It shows the existence of four phases: a complex quaternary fluoride Ba10Cu12ScF47, two “polytypic” phases the structure of which derives from that of BaCuF4 and a tetragonal solid solution Ba5Sc3-xCuxF19-x with 0 ≤ x ≤ 1.
    Additional Material: 5 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 590 (1990), S. 200-212 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Komplexe Kupfer (II)-fluoride. XIII. Das ternäre System BaF2—CuF2—GaF3 und die Kristallstruktur des Ba3CuGa2F14Das ternäre System BaF2—CuF2—GaF3 wurde röntgenographisch untersucht. Es liegen sieben quaternäre Phasen vor: sechs davon entsprechen kürzlich in anderen BaF2—CuF2—MF3-Systemen nachgewiesenen Phasen (drei „polytype“ Phasen, die bei der Zugabe kleiner Anteile von GaF3 zu BaCuF4 erhalten werden, einer tetragonalen nicht-stöchiometrischen-Phase: Ba3+xGa2-2xCu2xF12 und zwei stöchiometrischen Fluoriden: triklinem Ba2CuGa2F12 und monoklinem Ba10Cu12GaF47) die siebente Phase ist die bisher unbekannte, einer neuen Strukturtype zuordnende Verbindung Ba3CuGa2F14: monoklin (pseudoorthorhombisch), Raumgruppe P21/n mit a = 7,402(3), b = 27,88(1), c = 5,521(2) Å, β = 90,12(3)°, Z = 4. Die Struktur wurde aus Einkristalldaten mittels 5133 unabhängiger Reflexe (R = 0,047, Rw = 0,051) gelöst. Sie wird aufgebaut aus unendlichen cis-Ketten von GaF6-Oktaedern, die durch einfach bekappte trigonale Prismen von CuF7 verbunden sind.
    Notes: The ternary system BaF2—CuF2—GaF3 is investigated by X-ray diffraction experiments. It exhibits seven quaternary phases: six of which correspond to types previously evidenced in other BaF2—CuF2—MF3 systems (three “polytypic” phases obtained by adding small amounts of GaF3 to BaCuF4, a tetragonal non-stoichiometric phase: Ba3+x Ga2-2xCu2xF12 and two stoichiometric fluorides: triclinic Ba2CuGa2F12 and monoclinic Ba10Cu12GaF47); the seventh compound Ba3CuGa2F14 hitherto unknown, corresponds to a new structural type. It is monoclinic (pseudo-orthorhombic) space group P21/n with a = 7.402(3) Å, b = 27.88(1) Å, c = 5.521(2) Å, β = 90.12(3)°, Z = 4. The structure was solved from single crystal data using 5133 independent reflections (R = 0.047, Rw = 0.051). It is built up from infinite cis-chains of GaF6 octahedra linked by monocapped trigonal prisms CuF7.
    Additional Material: 6 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 613 (1992), S. 98-104 
    ISSN: 0044-2313
    Keywords: Barium fluoride  -  aluminium fluoride system ; liquid-solid phase diagram ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Das binäre System BaF2/AlF3Das System BaF2/AlF3 wird röntgenographisch sowie mittels DTA untersucht und das fest-flüssig Phasendiagramm aufgestellt. Es liegen fünf ternäre Fluoride vor: trimorphes BaAlF5, Ba3Al2F12, Ba5Al3F19, polymorphes Ba3AlF9 und Ba5AlF13. Neutronen-thermodiffraktometrische Versuche wurden zur Analyse einiger Teile des Diagramms durchgeführt. Die Gitterparameter der Fluoride werden angegeben und die Ergebnisse diskutiert und mit denen vorhergehender Arbeiten verglichen.
    Notes: The system BaF2/AlF3 is investigated by X-ray and D.T.A., and the liquid-solid phase diagram is established. Five ternary fluorides are disclosed: trimorphic BaAlF5, Ba3Al2F12, Ba5AlF19, polymorphic Ba3AlF9 and Ba5AlF13. Neutron thermodiffractometry experiments are performed to specify some parts of the diagram. The cell parameters of the fluorides are given and the results are discussed and compared with those of the previous works.
    Additional Material: 3 Ill.
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