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  • 1
    Electronic Resource
    Electronic Resource
    A pilot plant designed for the process study of hydrodenitrogenation and hydrogen consumption (1988)
    s.l. : American Chemical Society
    Industrial & engineering chemistry research 27 (1988), S. 1186-1193 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie00079a017
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  • 2
    Electronic Resource
    Electronic Resource
    Second modification of (E)-2,3,2′,3′-tetrahydro-[1,1′]biindenylidene (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. o1100-o1101 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A first crystalline modification of the title compound, C18H16, was published by Schaefer & Abul\overline{\rm u} [Acta Cryst. (1995), C51, 2364–2366]. We now report on a second modification. Both modifications belong to the space group C2/c and, in both, the molecules lie on centres of symmetry. In the first modification, the asymmetric unit contains one half molecule, whereas in the second there are two half-molecules in the asymmetric unit. The two crystallographically independent planar molecules of the second modification are tilted by an angle of 63.4° with respect to one another.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801017767
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  • 3
    Electronic Resource
    Electronic Resource
    1,3,1′,3′-Tetrahydro-[2,2′]biindenylidene (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. o1139-o1140 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In the investigated crystal of the title compound, C18H16, the unit cell contains two centrosymmetric and nearly planar molecules [maximum deviation from planarity 0.0401 (10) Å]. The length of the central double bond is 1.322 (2) Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801018311
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  • 4
    Electronic Resource
    Electronic Resource
    Über 1.2-Dithia-cyclopentene, XIII. Alkalische Spaltung des 1.2-Dithia-cyclopentenon-(3)-Rings, II. Befunde zur Dithiacyclobuten- bzw. Thiacyclopropen-Zwischenstufe und Synthese von 1.4-Dipiperidino-2.3-dimethoxycarbonylbutadien-(1.3) (1968)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 717 (1968), S. 154-168 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Für die Reaktion von 4-Halogen-1.2-dithia-cyclopentenonen-(3) 1 mit methanol. Alkali wird ein intermolekularer und ein intramolekularer Mechanismus nach Weg a und Weg b (S. 155) diskutiert. Es entstehen Schwefel-Heterocyclen, deren Struktur bewiesen wird. Die Reaktionsprodukte aus 1a und 1b gestatten keinen Rückschluß auf Weg a oder b. Das Reaktionsprodukt 10 aus 1c schließt dagegen Weg a aus. - 1.4-Dipiperidino-2.3-dimethoxycarbonylbutadien-(1.3) (18) ist aus dem Produkt der alkalischen Spaltung von 1c durch Entschwefelung zugänglich; physikalisches und chemisches Verhalten von 18 werden untersucht.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19687170117
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  • 5
    Electronic Resource
    Electronic Resource
    1.4-Di-n-alkyl-benzole (1966)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 696 (1966), S. 55-63 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesen und Eigenschaften der 1.4-Dialkyl-benzole 6 und 12 werden beschrieben.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19666960106
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  • 6
    Electronic Resource
    Electronic Resource
    Über die Chromsäureanhydrid-Oxidation von 3β-Acetoxy-5α-androstan-17-on, II1) (1973)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1973 (1973), S. 394-406 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Chromic Anhydride Oxidation of 3β-Acetoxy-5α-androstan-17-one, II1)Contrary to earlier reports nearly all available C—H bonds are attacked in the course of the oxidation of 3β-acetoxy-5α-androstan-17-one (1) with chromic anhydride in glacial acetic acid. Moreover, the D ring also undergoes degradation. Thus 3β-acetoxy-(de-D)-5α,13α-androstan-14-one (4) and 3β-acetoxy-5α-hydroxy-(de-D)-13α-androstan-14-one (5) are formed as degradation products. Apart from the known hydroxy derivative of 1, namely 3β-acetoxy-5α-hydroxyandrostan-17-one (2), 3β-acetoxy-14-hydroxy-5α-androstan-17-one (3) was also isolated from the mixture of oxidation products.
    Notes: Bei der Oxidation von 3β-Acetoxy-5α-androstan-17-on (1) mit Chromsäureanhydrid in Eisessig werden entgegen früheren Vorstellungen nahezu wahllos alle vorhandenen C—H-Bindungen angegriffen. Daneben wird auch der Ring D abgebaut. Es entsteht so das 3β-Acetoxy-(des-D)-5α,13α-androstan-14-on (4) und das 3β-Acetoxy-5α-hydroxy-(des-D)-13α-androstan-14-on (5). Aus dem Gemisch der Oxidationsprodukte wurde ferner neben dem bereits bekannten Hydroxyderivat von 1, dem 3β-Acetoxy-5α-hydroxy-androstan-17-on (2), das 3β-Acetoxy-14β-hydroxy-5α-androstan-17-on (3) isoliert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197319730306
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  • 7
    Electronic Resource
    Electronic Resource
    Über die Chromsäureanhydrid-Oxidation von 3 β-Acetoxy-5α-androstan-17-on, I (1973)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1973 (1973), S. 387-393 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Chromic Anhydride Oxidation of 3β-Acetoxy-5α-androstan-17-one, I1)MacPhillamy and Scholz1) obtained two compounds with the molecular formulae C21H32O5 and C23H34O6, besides other products, by oxidation of 3β-acetoxy-5α-androstan-17-one (1) with chromic anhydride in glacial acetic acid but did not determine their structures. We have now identified these compounds as 3β-acetoxy-5α,14β-dihydroxyandrostan-17-one (7) and 3β,14β-diacetoxy-5α-hydroxyandrostan-17-one (10).
    Notes: Mac Phillamy und Scholz1) erhielten bei der Oxidation von 3β-Acetoxy-5α-androstan-17-on (1) mit Chromsäureanhydrid in Eisessig neben anderen Produkten zwei Verbindungen der Bruttoformeln C21H32O5 und C23H34O6, deren Struktur nicht aufgeklärt wurde. Wie wir nun feststellten, handelt es sich dabei um 3β-Acetoxy-5α, 14β-dihydroxyandrostan-17-on (7) und 3β,14β-Diacetoxy-5α-hydroxyandrostan-17-on (10).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197319730305
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  • 8
    Electronic Resource
    Electronic Resource
    Über die Chromsäureanhydrid-Oxidation von 3β-Acetoxy-5α-androstan-17-on, III1,2) (1974)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1974 (1974), S. 693-701 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Chromic Anhydride Oxidation of 3β-Acetoxy-5α-androstan-17-one, III1,2)Oxidation of 3β-acetoxy-5α-androstan-17-one (1) with chromic anhydride leads to the formation of four diketones having the molecular formula C21H30O41,2). One of these was previously isolated and identified by MacPhillamy and Scholz3) as 3β-acetoxy-5α-androstane-6,17-dione (5). The other three isomers have now been shown to be 3β-acetoxy-5α-androstane-11,17- dione (2a), 3β-acetoxy-5α,9β-androstane-11,l7-dione (3a), and 3β-acetoxy-5α-androstane- 7,17-dione (4). Remarkably, 3a is formed with inversion of configuration at C-9.
    Notes: Bei der Chromsäureanhydrid-Oxidation von 3β-Acetoxy-5α-androstan-17-on (1) entstehen vier Diketone der Summenformel C21H30O41,2). Eines davon wurde bereits von MacPhillamy und Scholz3) isoliert und als 3β-Acetoxy-5α-androstan-6,17-dion (5) identifiziert. Es wird gezeigt, daß es sich bei den drei weiteren uni 3β-Acetoxy-5α-androstan-11,17-dion (2a), 3β-Acetoxy-5α,9β-androstan-11,17-dion (3a) und 3β-Acetoxy-5α-androstan-7,17-dion (4) handelt. Die Bildung von 3a ist bemerkenswert, da sie unter Konfigurationsumkehr an C-9 verläuft.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197419740502
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