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  • 1
    Call number: M 21.94488
    Description / Table of Contents: Frontmatter -- Vorwort zur 109. Auflage -- Vorwort zur 108. Auflage -- Vorwort zur 107. Auflage -- Vorwort zur 104. Auflage -- Inhalt -- Vorbemerkungen -- 1. Periodensystem der Elemente, Charakterisierung von Elementen, Verbindungen und Atomgruppen -- 2. Nomenklatur -- 3. Quantitative chemische Analyse -- 4. Instrumentelle Analytik - spektroskopische Methoden -- 5. Instrumentelle Analytik - Trennverfahren -- 6. Messung und Berechnung physikalischer Größen -- 7. Messung und Berechnung physikalisch-chemischer Größen -- 8. Statistische Messwertbeurteilung, Kalibrierungsverfahren und Regressionsrechnung -- 9. Größen, Einheiten und Umrechnungsfaktoren -- 10. Formeln und Rechentricks -- 11. Tabellen zur chemischen und chemisch-analytischen Arbeitstechnik -- 12. Arbeitssicherheit -- Literaturverzeichnis -- Register
    Pages: 436 Seiten
    Edition: 109. Auflage
    Edition: [Online-Ausgabe]
    ISBN: 9783110557831
    Series Statement: De Gruyter Studium
    URL: Cover
    Language: German
    Note: Mode of access: Internet via World Wide Web.
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 372-375 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Cyclic N-(2-Arylvinyl)ureas by Wittig ReactionTriphenyl(α-ureidoalkyl)phosphonium salts (1, 2, 8) react with aromatic aldehydes and ketones to give quite easily N-(2-arylvinyl)ureas (4a, b, 5a-i, 7, 9) according to Wittig.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0170-2041
    Keywords: Ketene O,N-acetals ; Antifungal agents ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Facile and Selective Synthesis of (Z)-tert-Butylketene O,N-AcetalsMelting the ketene O,O-acetals 1 with azoles in the presence of a catalytic amount of a proton acid yields the ketene O,N-acetals 2. The products of this phenol-azol substitution reaction are obtained as their (E/Z)-mixtures with the (Z)-isomers highly predominating. The (E)-isomers are easily converted into the (Z)-isomers by a proton acid catalysed isomerisation reaction.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1988 (1988), S. 235-240 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Facile Synthesis of Ketene O,N-Acetals and Ketene O,O-Acetals by Tosylate EliminationReaction of the alcohols 4 and 5 with p -toluenesulfonyl chloride leads to the sulfonic esters 6 and 7, respectively, which on treatment with potassium tert-butylate easily react to give the ketene O,N-acetals 8 and O,O-acetals 9, respectively. The (E/Z) isomers 8 arising from the elimination reaction of 7 were identified by their 1H-NMR data after X-ray analysis of one of the isomers of 8e. On one example it is shown that the elimination reaction proceeds stereoselectively „anti“.
    Notes: Durch Reaktion der Alkohole 4 und 5 mit p-Toluolsulfonylchlorid erhält man die Sulfonsäureester 6 und 7, die mit Kalium-tert-butylat unter Eliminierung leicht zu den Keten-O,N-acetalen 8 bzw. -O,O-acetalen 9 reagieren. Die aus 6 entstehenden (E/Z)-Isomere 8 konnten nach Röntgenstrukturanalyse eines der Isomeren von 8e auch 1H-NMR-spektroskopisch identifiziert werden. An einem Beispiel wurde gezeigt, daß die Tosylat-Eliminierung stereoselektiv „anti“ abläuft.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: [1.n]Paracyclophanes by Vacuum Vapour Phase Pyrolysis of DisulfonesBy vacuum vapour phase pyrolysis of the cyclic disulfones 7-9 at 580 C 0.01 Torr the sterically strained [1.n]paracyclophanes 1-3 were obtained in excellent yields. The lowest members of this series 1 (n=5) and 2 (n=6) were not accessible by other methods so far.
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  • 6
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Triarylmethyl Systems, III. Synthesis of α-Aryl[1.n]paracyclophanesAs triarylmethyl systems with unusual sterical orientation of the aryl rings α-aryl[1.n]paracyclophanes with n = 5-8 (1a-d, 8a,b) were synthesized via the corresponding dithia[1.(n + 2)]-paracyclophanes (2a-d, 6a,b) and the disulfones (3a-d, 7a,b) derived therefrom. The sterical situation in these α-aryl[1.n]paracyclophanes is discussed, especially on the basis of 1H NMR data.
    Notes: Als Triarylmethyl-Systeme mit ungewöhnlicher räumlicher Orientierung der Aryl-Ringe wurden α-Aryl[1.n]paracyclophane mit n = 5-8 (1a-d, 8a,b) über die entsprechenden Dithia-[1.(n + 2)]paracyclophane (2a-d, 6a,b) und die davon abgeleiteten Disulfone (3a-d, 7a,b) dargestellt. Die sterischen Verhältnisse dieser α-Aryl[1.n]paracyclophane werden, besonders anhand von 1H-NMR-Spektren, diskutiert.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Triarylmethyl Systems, IV. Synthesis and Reactions of α-Hydroxy- and α-Halo-α-aryl[1.n]paracyclophanesBy bromination of hydrocarbons 1a-d and 6 α-bromo-α-aryl[1.n]paracyclophanes with n = 5-8 (2a-d, 7) were prepared. Via 2a-d α-hydroxy-α-aryl[1.n]paracyclophanes 3a-d were obtained, starting from which the α-chloro and α-fluoro derivatives 4a-d and 5a,b, resp., were synthesized. - Compounds of the types 2-5 were of interest as representatives of a special triarylmethyl system for which, due to the [1.n]paracyclophane structure, unusual steric and electronic effects were to be expected. The formation of p,p′-bridged triarylmethyl radicals 8 from 2a-d and their dimerisation were investigated. Rate constants for the hydrolysis of α-bromo and α-chloro compounds 2a-d and 4a-d proceeding via the carbenium ions 9 were determined in water/acetone by conductivity measurements. Stabilities of 9 (n = 5-8), formed from the hydroxy compounds 3a-d in conc. sulfuric acid, were determined; their dependence on n is discussed in terms of specific steric and electronic effects of the α-aryl[1.n]paracyclophane system. Some spectroscopic data are reported for the carbanions 10.
    Notes: Durch Bromierung der Kohlenwasserstoffe 1a-d und 6 wurden α-Brom-α-aryl[1.n]paracyclophane mit n = 5-8 (2a-d,7) dargestellt. Aus 2a-d erhielt man die α-Hydroxy-Verbindungen 3a-d, von denen aus die α-Chlor- und α-Fluor-Derivate 4a-d bzw. 5a,b zugänglich waren. - Verbindungen des Typs 2-5 interessierten als Vertreter eines besonderen Triarylmethyl-Systems, für das als Folge der [1.n]Paracyclophan-Struktur ungewöhnliche sterische und elektronische Effekte zu erwarten waren. Die Bildung der p,p′-überbrückten Triarylmethyl-Radikale 8 aus 2a-d und ihre Dimerisierung wurden untersucht. Die Geschwindigkeiten der über Carbenium-Ionen 9 verlaufenden Hydrolysen der α-Brom- und α-Chlor-Verbindungen 2a-d bzw. 4a-d in Wasser/Aceton wurden durch Leitfähigkeitsmessungen bestimmt und mit denen der entsprechenden Di- und Triphenylmethyl-Derivate verglichen. Die Stabilitäten der aus den α-Hydroxy-Verbindungen 3a-d in konz. Schwefelsäure erzeugten Carbenium-Ionen 9 mit n = 5-8 wurden ermittelt; ihre Abhängigkeit von n wird unter dem Gesichtspunkt der sterischen und elektronischen Effekte des α-Aryl[1.n]paracyclophan-Systems diskutiert. Einige spektroskopische Daten der Carbanionen 10 werden mitgeteilt.
    Additional Material: 3 Tab.
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