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  • Inorganic Chemistry  (9)
  • Organic Chemistry  (7)
  • Surface physics, nanoscale physics, low-dimensional systems
  • 42.75
  • 1980-1984  (16)
  • 1
    Electronic Resource
    Electronic Resource
    Pyrane, 100. 5,6-Dihydro-2H-pyran-3(4H)-on als Baustein zur Synthese pyrananellierter Heterocyclen (1984)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 1759-1777 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pyrans, 100.  -  5,6-Dihydro-2H-pyran-3(4H)-one as a Building Unit for the Synthesis of Pyran-annulated Heterocyclic CompoundsOnly in a few cases 5,6-dihydro-2H-pyran-3(4H-one (3) reacts regioselectively with ortho-substituted phenylcarbonyl compounds to form pyran-annulated heterocyclic compounds like the pyrano[3,2-b]quinoline 7c. Better results are obtained in reactions involving the enamine 15d derived from 3, the silyl enol ether 18 and the lithium enolate 14 derived from 18. These pyran derivatives with 2,3- or 3,4-double bonds are well suited for successful synthesis of 2- or 4-substituted 3-pyranones such as 2, 21a, 21b, 23a-c, 26a-c, 31a-c, 32, and 35a-c. They also allow to synthesize pyrano[3,2-b]- or -[3,4-b]quinolones, -chromones, and -thiochromones 6a, 30a-c, 38a-d.
    Notes: Während 5,6-Dihydro-2H-pyran-3(4H)-on (3) sich mit ortho-substituierten Phenylcarbonylverbindungen nur in Einzelfällen regioselektiv zu pyrananellierten Heterocyclen umsetzt - z. B. zum Pyrano[2,3-b]chinolin 7c -, gelingt das besser mit dem aus 3 hergestellten Enamin 15d, dem Silylenolether 18 und dem daraus gewonnenen Lithiumenolat 14. Diese Pyranderivate mit 2,3-oder 3,4-Doppelbindungen eignen sich zur gezielten Darstellung von 2- oder 4-substituierten 3-Pyranonen - z.B. 2, 21a, 21b, 23a-c, 26a-c, 31a-c, 32, sowie 35a-c - und von Pyrano[3,2-b]- oder -[3,4-b]chinolinen, -chinolonen, -chromonen und -thiochromonen 6a, 30a-c und 38a-d.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198419841102
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  • 2
    Electronic Resource
    Electronic Resource
    Benzothiazole durch C—C-Spaltung von α-[(2-Nitrophenyl)thio]ketonen (1984)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 1100-1108 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Benzothiazoles by C-C Cleavage of α-[(2-Nitrophenyl)thio] KetonesReaction of α-[(2-nitrophenyl)thio] ketone 4, 11a-c and 16 with ammonia and sodium hydroxide solution, resp., leads to C—C cleavage and formation of the benzothiazole N-oxide derivatives 8, 12a-c and 17. The 3-[(2-nitrophenyl)thio]-4-piperidone derivative 22 yields 2-benzothiazolecarbaldehyde 23.
    Notes: Einwirkung von Ammoniak bzw. Natronlauge auf die α-[(2-Nitrophenyl)thio]ketone 4, 11a-c und 16 führt unter C—C-Spaltung zu den Benzothiazol-N-oxid-Derivaten 8, 12a—c und 17; aus dem 3-[(2-Nitrophenyl)thio]-4-piperidon-Derivat 22 entsteht der 2-Benzothiazolcarbaldehyd 23.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198419840607
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  • 3
    Electronic Resource
    Electronic Resource
    Fluoraustauschreaktionen an Metalltrifluorphosphan-Komplexen. X [1]. Zum Reaktionsverhalten von Tetrakis(trifluorphosphan)-nickel(0) mit Metallorganylen [2]Professor Marianne Baudler zum 60. Geburtstage am 27. April 1981 gewidmet (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 475 (1981), S. 156-164 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ni(PF3)4 (1) tauscht mit Lithiumorganylen und Grignard-Reagentien Fluor gegen Organyl-Gruppen aus, wobei die Komplexe (10-32) Ni(PF3)4-n(PF2R)n (n = 1, 2 und 3), Ni(PF3)3(PFR2), Ni(PF3)2(PF2R)(PFR2) und Ni(PF3)3(PR3) (R = organ. Rest) gebildet werden. Für den Reaktionsablauf wird ein Vierzentren-Synchron-Mechanismus vorgeschlagen.Fluorine Exchange in Trifluorophosphane Metal Complexes. X. Reactions of Tetrakis(trifluorophosphane)nickel(0) with Metal OrganylsThe fluorine atoms in Ni(PF3)4 (1) can be partially substituted by organyl groups yielding the complexes (10-32) Ni(PF3)4-n(PF2R)n (n = 1, 2 and 3), Ni(PF3)3(PFR2), Ni(PF3)2(PF2R)(PFR2) and Ni(PF3)3(PR3) (R = organyl group). The mechanism of these peripheric reactions is discussed by assuming a four centered type intermediate.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814750418
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Kenntnis neuer Fluoride des Typs Ba2MIIMIIIF9 [1] Ba2MII AlF9, Ba2 MII GaF9, Ba2MII CoF9 und Ba2MII NiF9 mit MII = Co, Ni, Zn und Mg (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 493 (1982), S. 59-64 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Fluorides of the Type Ba2MIIMIIIF9: Ba2MIIAlF9, Ba2MIIGaF9, Ba2MIICoF9, and Ba2MIINiF9 with MII = Co, Ni, Zn, and MgFluorides of the type Ba2MIIMIIIF9 appear in 3 different structures: Fluorides with MIII = Al crystallize orthorhombic (Ba2ZnAlF9-type of structure), or (MIII = metal of 3d series) in a monoclinic distorted variant (exeption: Ba2NiGaF9 in the case MII = Mg a tetragonal unit cell (Ba2MnFeF9-type of structure) is found.
    Notes: Fluoride des Typs Ba2MIIMIIIF9 treten in 3 unterschiedlichen Strukturen auf: Fluoride mit MIII=Al kristallisieren orthorhombisch (Ba2ZnAlF9-Typ) oder MIII=Metall der 3d-Reihe) in einer monoklin verzerrten Variante (Ausnahme: Ba2NiGaF9); für den Fall MII = Mg findet man eine tetragonale Elementarzelle (Ba2MnFeF9-Typ).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824930108
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  • 5
    Electronic Resource
    Electronic Resource
    Neues über Pentafluorometallate(III). SrNiF5, BaNiF5, BaCoF5 und CdCoF5 (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 490 (1982), S. 111-120 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: News on Pentafluoro Metallates(III), SrNiF5, BaNiF5, BaCoF5, and CdCoF5Samples of BaNiF5 and for the first time SrNiF5 have been prepared by pressure fluorination (monel-autoclaves, pF2 = 50 bar, 400°C, 48 h and pF2 = 20-30 bar, 420 ± 30°C, 4 d, respectively). On the other side BaCoF5 and CdCoF5 are obtained by heating in a diluted stream of F2.Crystal data are BaNiF5: light grey-violet, orthorhombic, a = 987.3(1), b = 547.19(6), c = 743.87(8) pm; SrNiF5; dark-brown, BaGaF5-type of structure, a = 1 326.5(2), b = 544.04(6), c = 492.69(5) pm; BaCoF5: light blue, orthorhombic, a = 1 392.2(2), b = 562.01(7), c = 496.50(6) pm; CdCoF5: light blue, a = 878.7(2), b = 641.01(8), c = 749.5(2) pm, β = 115.27(2)°, CaCrF5-type of structure.The Madelung Part of Lattice Energy, MAPLE, of SrNiF5 and CdCoF5 is discussed.
    Notes: Durch Fluorierung unter erhöhtem Druck (Monel-Autoklav, pF2 = 50 bar, 400°C, 48 h) wurden hellgrauviolette Proben von BaNiF5 (orthorhombisch, a = 9,873(1); b = 5,4719(6); c = 7,4387(8) Å) sowie erstmals braunes (Monel-Autoklav, pF2 = 20-30 bar, 420 ± 30°C, 4 d) SrNiF5 (BaGaF5-Typ, a = 13,265(2); b = 5,4404(6); c = 4,9269(5) Å) erhalten.Dagegen entstehen hellblaue Pulver von BaCoF5 (orthorhombisch; a = 13,922(2); b = 5,6201(7); c = 4,9650(6) Å) und CdCoF5 (CaCrF5-Typ; a = 8,787(2); b = 6,4101(8); c = 7,495(2) Å, β = 115,27(2)°) bereits im verdünnten Fluorstrom.Der Madelunganteil der Gitterenergie, MAPLE, von SrNiF5 und CdCoF5 wurde diskutiert.
    Additional Material: 13 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824900113
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  • 6
    Electronic Resource
    Electronic Resource
    Beiträge zur Strukturchemie phosphorhaltiger Ketten und Ringe. 11. Die Kristall- und Molekülstrukturen der beiden Konfigurationisomeren des Tetraphospha-silaspiro[2.2]pentans (PBut)2Si(PBut)2Die Ergebnisse dieser Untersuchung sind am 9. 8. 1983 auf dem “Eighth European Crystallographic Meeting” (ECM 8) in Lüttich kurz mitgeteilt worden [2]. (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 515 (1984), S. 7-18 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structural Chemistry of Phosphorus Containing Chains and Rings. 11. Crystal and Molecular Structures of the Two Stereoisomers of Tetraphospha-silaspiro[2.2]pentane (PBut)2Si(PBut)2The spirocyclic compound 1,2,4,5-tetra-tert-butyl-1,2,4,5-tetraphospha-3-silaspiro[2.2]pentane exists in tow diastereomers of point symmetry 4 and 2. The isomer with symmetry 4 even in the solid crystallizes tetragonally in I41/a with a = 1247.0, c = 1505.5 pm and Z = 4. The isomer of fairly exact symmetry 2 crystallizes triclinically in P1 with a = 612.8, b = 996.3, c = 1017.2 pm, α = 75.63, β = 72.38, γ = 88.71° and Z = 1. In this disordered structure the surroundings of Si is slightly distorted due to the influence of the substituents. The (average) bond lengths are (4, 2): d(Si—P) = 220.09(9), 221.5(5); d(P—P) = 225.5(2), 224.2(5); d(P—C) = 189.4(3), 190(2); d(C—C) = 151.4(4), 152(3) pm. The geometry of the substituents in both isomers is quite normal.
    Notes: Die Spiroverbindung 1,2,4,5-Tetra-tert-butyl-1,2,4,5-tetraphospha-3-silaspiro[2.2]pentan liegt in zwei Diastereomeren der Punktsymmetrie 4 und 2 vor. Das Isomer der auch im Festkörper exakten Symmetrie 4 kristallisiert tetragonal in der Raumgruppe I41/a mit a = 1247,0, c = 1505,5 pm und Z = 4. Das sterisch weniger günstige Isomer der im Festkörper nicht streng erfüllten Symmetrie 2 kristallisiert triklin in der Raumgruppe P1 mit a = 612,8, b = 996,3, c = 1017,2 pm, α = 75.63, β = 72,38, γ = 88,71° und Z = 1. In dieser nur fehlgeordnet beschreibbaren Struktur wird die Umgebung des Si durch Substituenteneinflüsse etwas verzerrt. Die (mittleren) Bindungslängen betragen (4, 2): d(Si—P) = 220,09(9), 221,5(5); d(P—P) = 225,5(2), 224,2(5); d(P—C) = 189,4(3), 190(2); d(C—C) = 151,4(4), 152(3) pm. Die Geometrie der Substituenten ist in beiden Isomeren normal.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845150802
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  • 7
    Electronic Resource
    Electronic Resource
    Photochemie von Aminoketonen. IV [1]. Synthese von 3-Aryl-pyrrolidinolen-(3) durch Photocyclisierung von β-Amino-propiophenonen (1981)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 435-444 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Photochemistry of Aminoketones. IV. Synthesis of 3-Aryl-pyrrolidinols-(3) via Photocyclization of β-Amino-propiophenonesPhotolysis (λirr ≥ 300 nm) of N-benzyl-N-benzoyl-β-aminopropiophenones 6-9 in abs. ether affords a 47-50% yield of N-benzoyl-pyrrolidinols 12-18. The relative configurations of the diastereomeric 12-18 are determined by 1H-n.m.r. spectroscopy. The different behaviour of the N-acylated 6-9 in contrast to N,N-dialkyl-β-aminopropiophenones is explained by assumption of a dipol-dipol interaction between the keto and the amido carbonylgroups in the n,π*-excited state.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19813230310
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  • 8
    Electronic Resource
    Electronic Resource
    Solanum alkaloids. CIX. A Mild Biomimetic Ring Closure of 16β-Hydroxylated 22.26-Epiminocholestanes to spirosolane alkaloids (1981)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 839-842 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Solanumalkaloide. CIX. Ein mildes biomimetisches Verfahren zum Spiroaminoketal-Ringschluß von 16β-hydroxylierten 22.26-Epimino-cholestanen
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19813230516
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  • 9
    Electronic Resource
    Electronic Resource
    Diels-Alder-Reaktionen. IX. Über Bildung und Thermolyse der isomeren Tricyclopentadiene (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 924-934 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Diels-Alder-Reactions. IX. On the Formation and the Thermolysis of Isomeric TricyclopentadienesThe formation of isomeric tricyclopentadienes by codimerisation of cyclopentadiene with endo- and exo-dicyclopentadiene between 100 and 140°C in the liquid phase, and the retrodiene reaction of the main isomeres of the tricyclopentadiene fraction by gas phase thermolysis were studied kinetically between 230 and 310°C. The rate constants and the parameters of activation were determined.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260610
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Dimorphie von BaNiF6 (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 489 (1982), 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: Dimorphism of BaNiF6By pressure fluorination synthesis bright carmine red samples of Ba[NiF6] (monoclinic, a = 9.465; b = 4.950; c = 9.516 Å, β = 103.4°; Z = 4) are obtained. The trigonal modification (BaGeF6-type of structure, a = 7.268; c = 6.981 Å, Z = 3) is formed under static pressure (300°C, 50 kbar) only. The bond length Ni—F = 1.78 Å is discussed by means of the Madelung Part of the Lattice Energy, MAPLE. The magnetic behaviour is studied.
    Notes: Bei der Fluorierung unter erhöhtem Druck entstehen karminrote Proben von Ba[NiF6](monoklin, a = 9.465; b = 4,950; c = 9,615 Å; β =103,4°; Z = 4) Erst unter statischem Druck (300°C, 50 kbar) entsteht die trigonale Form (BaGeF6-Typ, a = 7,268; c = 6,981 Å, Z = 3). Die Bindungslänge Ni—F = 1,78 Å wurde über MAPLE-Rechnungen bestimmt. Das magnetische Verhalten wird diskutiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824890102
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