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  • Organic Chemistry  (8)
  • crystal structure  (6)
  • Wiley-Blackwell  (14)
  • 1990-1994  (11)
  • 1980-1984  (3)
  • 1975-1979
  • 1950-1954
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  • 1993  (11)
  • 1983  (3)
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  • Wiley-Blackwell  (14)
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  • 1990-1994  (11)
  • 1980-1984  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Etudes sur les composés organométalliques. XIX.Partie XVIII, v. [1]. Synthèse et caractérisation de composés alkoxy (alkyl)titane (IV) (1983)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 66 (1983), S. 898-901 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Studies of Organometallic Compounds. Synthesis and Characterization of Some Alkoxy (alkyl)-titanium(IV) CompoundsAlkoxy(benzyl)titanium and alkoxy(cyclohexyl)titanium compounds are prepared by alcoholysis of tetrabenzyl- and tetracyclohexyltitanium. Structural features are investigated by means of 1H-NMR.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19830660323
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  • 2
    Electronic Resource
    Electronic Resource
    Structure elucidation of a Pyoverdin Produced by Pseudomonas aeruginosa ATCC 27 853 (1993)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 335 (1993), S. 83-87 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The primary structure of a pyoverdin (Pa TII) isolated from an iron deficient culture medium of Pseudomonas aeruginosa ATCC 27 853 has been elucidated by spectroscopic methods and degradation studies. Total assignment of 1H and 13C resonances as well as sequential information were achieved by two-dimensional NMR techniques: HOHAHA1, NOESY, HSQC and HMBC. The structure consists of the common pyoverdin chromophore 5-amino-2,3-dihydro-8,9-dihydroxy-1H-pyrimido [1,2-a]quinoline-1-carboxylic acid with succinic acid bound amidically to its amino group and the carboxyl group linked to the N-terminus of D-Ser-D(CHO) OHOrn-L-Orn-Gly-D-aThr-L-Ser-L-cOHOrn. According to the short-hand nomenclature suggested in [2, 3] the pyoverdin may be described as pyoverdin-Q-so′ OGtaSo′*-SUC.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19933350113
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  • 3
    Electronic Resource
    Electronic Resource
    Schwermetall- und chloridhaltige Filterstäube. I. Phasenanalysen und Modellversuche zum Recycling (1993)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 335 (1993), S. 255-261 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Flue Dusts Containing Heavy Metal Ions and Chloride.I. Phase Analysis, Model Experiments for RecyclingFour flue dusts from a cement factory, an electric-furnace steelmaking plant and a municipal waste plant were analyzed by powder diffraction methods. Chloride combines above all with alkali ions or heavy metal ions, especially yielding PbCl2 and KPb2Cl5. The controlled sublimation of these chloride compounds in open crucibles was developed and optimized in our laboratory. Between 850°C and 1150°C and at reaction times from 30 min up to 12 h, the chloride content decreases to below 0.1 wt-%. The sublimed phase mainly consists of alkali and lead chloride. Zinc is found in the flue dust as oxide and is enriched during this process. Recent investigations with a small waelz kiln give analogous results. With our procedure, the manufacturer by himself is able to exploit flue dusts containing a large amount of heavy metal elements and chloride which cannot be deposited. The remaining product contains mainly zinc oxide which can be recycled in the zinc industry or returned to the production process. The sublimed chloride compounds may be recycled in the potash industry.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19933350307
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  • 4
    Electronic Resource
    Electronic Resource
    Kohlenhydrate mit 2,6-Dioxabicyclo[3.3.0]octan-Gerüst: Vergleichende Untersuchung von 3,6-Anhydrohexofuranosederivaten mit D-gluco-, D-manno-, L-ido- und L-gulo-Konfiguration (1983)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1983 (1983), S. 1310-1331 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carbohydrates Containing the 2,6-Dioxabicyclo[3.3.0]octane Skeleton: 3,6-Anhydrohexofuranose Derivatives with D-gluco, D-manno, L-ido, and L-gulo ConfigurationAll possible 3,6-anhydrofuranoses as well as their triacetates, methyl glycosides, and methyl diacetylglycosides have been prepared, some of them for the first time. This allowed an analysis of the equilibria of the anomers of the free sugars in water and of the anomeric composition of methyl glycosides. 1H NMR spectra of these and other related derivatives showed the clear preference of conformations with quasi-axial orientation of the substituent at C-1. 13C NMR spectra and optical rotations are also discussed.
    Notes: Es wurden alle möglichen 3,6-Anhydrofuranosen sowie deren Triacetate, Methylglycoside und deren Diacetate z. T. erstmalig synthetisiert. Dies ermöglichte eine genaue Analyse der Anomerengleichgewichte sowohl der freien Verbindungen in wäßriger Lösung als auch bei deren Umsetzung zu den Methylglycosiden. Die 1H-NMR-spektroskopische Untersuchung der vorgenannten sowie weiterer Derivate ergab eine eindeutige Bevorzugung von Konformationen, in denen der Substituent an C-1 eine quasi-axiale Orientierung einnimmt. Darüberhinaus werden die 13C-NMR-spektren und die optischen Rotationen diskutiert.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198319830805
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  • 5
    Electronic Resource
    Electronic Resource
    Methyl-2,5 : 3,6-dianhydro-D-mannofuranoside (1983)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1983 (1983), S. 1345-1353 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Methyl 2,5:3,6-Dianhydro-D-mannofuranosidesMonotosylation of methyl 3,6-anhydro-β-D-glucofuranoside gives as minor reaction product 1 which yields by treatment with sodium ethanolate methyl 2,5 : 3,6-dianhydro-β-D-mannofuranoside (2). The α-anomer 6 is equally prepared from 3 which is obtained by selective monotosylation of methyl 3,6-anhydro-β-L-gulofuranoside. Reaction of methyl 3,6-anhydro-2,5-di-O-tosyl-α-D-glucofuranoside (5) gives only small amounts of 6 accompanied by the monotosylate 4. Mass and NMR spectra (2D-1H and 13C) of the new dianhydrides 2 and 6 are described.
    Notes: Monotosylierung von Methyl-3,6-anhydro-bT-D-glucofuranosid ergibt als Nebenprodukt 1, dessen Behandlung mit Natrium-ethanolat zum Methyl-2,5 : 3,6-dianhydro-β-D-mannofuranosid (2) führt. Das entsprechende α-Anomere 6 kann analog aus 3, dem Produkt der selektiven Monotosylierung des Methyl-3,6-anhydro-β-L-gulofuranosids erhalten werden. Hingegen liefert die Umsetzung des Methyl-3,6-anhydro-2,5-di-O-tosyl-α-D-glucofuranosids (5) nur geringe Mengen 6 neben Monotosylat 4. Die NMR-Spektren (2D-1H und 13C) sowie der massenspektrometrische Zerfall der neuen Dianhydride 2 und 6 werden beschrieben.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198319830807
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  • 6
    Electronic Resource
    Electronic Resource
    Epoxidierung von Kohlenstoff-Kohlenstoff-Doppelbindungen in Terpenen durch Linolsäurehydroperoxide (1993)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1993 (1993), S. 1253-1256 
    Details
    ISSN: 0170-2041
    Keywords: Terpenes ; Epoxides ; Linoleic acid derivatives ; Hydroperoxides ; Labeled compounds, 18O2 ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Epoxidation of Carbon-Carbon Double Bonds in Terpenes by Linoleic Acid HydroperoxidesEpoxidation of C=C double bonds in terpenes is achieved by reaction with linoleic acid hydroperoxides (LOOH) exemplified with caryophyllene (3), methyl farnesoate (5) and squalene (8). Linoleic acid (9S)-hydroperoxide was obtained by reaction of linoleic acid (1) with lipoxygenase present in tomato homogenisate. When 18O2-labeled (9S)-LOOH (2) was used 18O was found in the terpene epoxide. While 3 is converted under physiological conditions regioselectively in high yiled into its 4,5-epoxide 4, the yield of epoxidized products from long-chain molecules, e.g. squalene (8), decreases strongly and no regioselectivity was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1993199301204
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  • 7
    Electronic Resource
    Electronic Resource
    Das wasserfreie Lanthanacetat, La(CH3COO)3, und sein Precursor, NH4)3[La(CH3COO)6] · 1/2 H2O: Synthese, Strukturen, thermisches Verhalten (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1603-1608 
    Details
    ISSN: 0044-2313
    Keywords: Lanthanum acetate ; ammonium lanthanum acetate ; synthesis ; crystal structure ; thermal behaviour ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Anhydrous Lanthanum Acetate, La(CH3COO)3, and its Precursor, ·NH4)3[La(CH3COO)6] · 1/2 H2O: Synthesis, Structures, Thermal BehaviourSingle crystals of (NH4)3[La(CH3COO)6] · ½ H2O are obtained by refluxing La2O3in (CH3COO)3 · 1.5 H2O with an excess of NH4CH3COO in methanol. The crystal structure (trigonal, R3, Z = 6, a = 1 365.0(3) pm, c = 2 360(1) pm, R = 0.088, Rw = 0.061 exhibits the coordination number of nine for La3+, which is surrounded by three chelating-type bidentate and three unidentate acetate groups. Characteristic are monomeric units of [La(CH3COO)6]3- which are connected to a three-dimensional network by hydrogen bonds with the NH4+ ions. Thermal decomposition consists of four steps with La(CH3COO)3, La2(CO3)3 and La2O2CO3 as intermediates and La2O3 as the final Product. Single crystals of La(CH3COO)3 are obtained from La2O3 in a melt of NH4CH3COO (molar ratio 1:12) in a sealed glass ampoule. The crystal structure (trigonal, R3, Z = 18, a = 2 203.0(5) pm; c = 987.1(3) pm, R = 0.027, Rw = 0.023) shows the coordination number of ten for La3+. These are three-dimensionally connected by oxygen atoms of the acetate groups with two tetradentate double-bridging and one Z,Z-type-bridging bidentate acetate group.
    Notes: (NH4)3[La(CH3COO)6] · 1/2 H2O erhält man in Form von Einkristallen durch Erhitzen von La2O3 bzw. La(CH3COO)3 · 1,5 H2O mit einem Überschuß von Ammoniumacetat in Methanol. Die Röntgenstrukturanalyse (trigonal, R3, Z = 6, a = 1 365,0(3) pm, a = 2 360(1) pm, R = 0,088, Rw = 0,061 zeigt, daß La3+ von jeweils drei „chelating-type bidentate“- bzw. „unidentate“-Acetatgruppen umgeben ist (Koordinationszahl neun). Die Kristallstruktur wird von monomeren anionischen Baueinheiten [La(CH3COO)6]3- bestimmt, welche über Wasserstoffbrückenbindungen mit den NH4+-Ionen zu einer dreidimensionalen Struktur verknüpft sind. Der thermische Abbau verläuft in vier Stufen über La(CH3COO)3, La2(CO3)3 und La2O2CO3 zu La2O3. Einkristalle von La(CH3COO)3 erhält man aus einer Schmelze von La2O3 in NH4CH3COO (molares Verhältnis 1:12) in einer abgeschmolzenen Glasampulle. Die Röntgenstrukturanalyse (trigonal, R3, Z = 18, a = 2 203,0(5) pm; c = 987,1(3) pm, R = 0,027, Rw = 0,023) ergibt für La3+ die Koordinationszahl zehn. Die La3+-Ionen sind dreidimensional über die Sauerstoffatome der Acetatgruppen verknüpft, Pro La3+ zwei „tetradentate double-bridging“-Acetatgruppen und eine „Z,Z-type-bridging bidentate“-Acetatgruppe.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190916
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis, structure, and X-ray absorption spectra of LixNbO2 and NaxNbO2 (x ≤ 1) (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1369-1373 
    Details
    ISSN: 0044-2313
    Keywords: Ternary niobium oxides ; synthesis ; crystal structure ; X-ray absorption near-edge structure (XANES) studies ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung, Struktur und Röntgenabsorptionsspektren von LixNbO2 und NaxNbO2 (x ≤ 1)Zwei Serien von Verbindungen, LixNbO2 und NaxNbO2, wurden durch Oxidation von LiNbO2 und NaNbO2 dargestellt. Die Auswertung von Neutronenbeugungsexperimenten ergibt eine vollbesetzte Lithium-Lage für x = 1. Auch wenn sich die Kristallsymmetrie für x 〈 1 nicht ändert, wie durch Guinier-Aufnahmen gezeigt wird, zeigen die Spektren der Nb—LIII-Kanten doch signifikante Änderungen, die auf eine abnehmende Besetzung der Nb-d-Zustandsdichte hinweisen.
    Notes: The two series of compounds, LixNbO2 and NaxNbO2, were synthesized from LiNbO2 and NaNbO2 with oxidizing agents. From neutron diffraction, it is concluded that the Li position is fully occupied for x = 1. Even though the long-range crystal symmetry does not seem to change for x 〈 1, as monitored by Guinier X-ray powder patterns, the Nb—LIII XANES spectra exhibit significant spectral variations with x which reflect changes in the unoccupied d-density of states.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190808
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  • 9
    Electronic Resource
    Electronic Resource
    CsPr(CO3)2: Erste Einkristalle eines wasserfreien ternären Selten-Erd-Carbonats (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 2031-2037 
    Details
    ISSN: 0044-2313
    Keywords: Cesium praseodym carbonate ; synthesis ; crystal structure ; IR spectroscopy ; thermal behaviour ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: CsPr(CO3)2: First Single Crystals of an Anhydrous Ternary Rare-Earth CarbonateFor the first time, single crystals of CsPr(CO3)2 were obtained by thermolysis of Cs2(H3O)Pr(CH3COO)6 at 400°C under high CO2 pressure (300 bar) in a steel autoclave. The crystal structure (triclinic, P1, Z = 4, a = 860.2(3), b = 887.4(3), c = 892.6(3) pm, α = 98.56(2), β = 96.19(1), γ = 115.29(2)°, Vm = 90.03(6) cm3/mol, R = 0.033, Rw = 0.029) was determined from four-circle-diffractometer data. CsPr(CO3)2 forms an aragonite like layer structure. Layers containing Cs+ and Pr3+ in a 1 : 1 ratio are stacked in the fashion of the hexagonal closest packing in the [001] direction. They are separated through CO32- ion layers. The Pr3+ ions are surrounded by 8 or 9 oxygen atoms, the coordination numbers of Cs+ are 11 and 12. The site symmetry of the CO32- ions is C1. All bands of the internal vibrations are observed in the IR spectrum. CsPr(CO3)2 decomposes above in 435°C to Cs2CO3 and Pr2O2CO3.
    Notes: Erstmals wurden Einkristalle von CsPr(CO3)2 bei der Thermolyse von Cs2(H3O)Pr(CH3COO)6 bei 400°C unter erhöhtem CO2-Druck (300 bar) in einem Stahlautoklaven erhalten. Die Kristallstruktur triklin, P1, Z = 4, a = 860,2(3), b = 887,4(3), c = 892,6(3) pm, α = 98,56(2), β = 96,19(1), γ = 115,29(2)°, Vm = 90,03(6) cm3/mol, R = 0,033, Rw = 0,029 wurde anhand von Vierkreisdiffraktometerdaten bestimmt. CsPr(CO3)2 bildet eine dem Aragonit verwandte Schichtstruktur: Schichten, die Cs+ und Pr3+ im Verhältnis 1 : 1 enthalten, sind nach dem Motiv einer hexagonal-dichtesten Packung in Richtung [001] gestapelt. Dazwischen liegen Carbonat-Schichten. Die Pr3+-Ionen sind von 8 bzw. 9 Sauerstoffatomen umgeben, die Koordinationszahlen für Cs+ sind 11 bzw. 12. Im Gegensatz zu Aragonit ist in CsPr(CO3)2 die Symmetrie der Carbonat-Ionen C1: Die inneren Schwingungen des CO32--Ions werden alle im IR-Spektrum beobachtet. Thermoanalytische Untersuchungen in Argon-Atmosphäre zeigen, daß CsPr(CO3)2 oberhalb 435°C in Cs2CO3 und Pr2O2CO3 zerfällt.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936191211
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  • 10
    Electronic Resource
    Electronic Resource
    Structure Elucidation of the Gallium-Ornibactin Complex by 2D-NMR Spectroscopy (1993)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1993 (1993), S. 43-48 
    Details
    ISSN: 0170-2041
    Keywords: Ornibactin ; Siderophore ; Iron complex ; Gallium complex ; Pseudomonas strain TVV 69 ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From a Pseudomonas strain novel hydroxamate/carboxylate siderophores were isolated which were named ornibactins representing the modified tetrapeptide L-Orn1(Nδ-OH,Nδ-acyl)-D-threo-Asp(β-OH)-L-Ser-L-Orn4(Nδ-OH,N δ-formyl)-1,4-diaminobutane. The side-chain amino function of Orn1(Nδ-OH,Nδ-acyl) is acylated by 3-hydroxyoctanoic acid in the most lipophilic component of the microheterogeneous siderophore mixture. The structure elucidation was based on GC amino acid analysis, GC-MS and electrospray mass spectrometry of the iron complex. The 3-hydroxyoctanoic acid and the primary sequence were established on the basis of 1H and inverse detected 13C two-dimensional NMR spectra (COSY, TOCSY, NOESY, HMQC, HMBC) of the gallium-ornibactin-F complex which allowed the complete assignment of all 1H and 13C signals.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199319930108
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