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  • 1975-1979  (15)
  • 1970-1974  (19)
  • 11
    Electronic Resource
    Electronic Resource
    1,3-Butadienylsulfoniumsalze, II. Reaktionen von trans-(1,3-Butadienyl)dimethylsulfonium-halogeniden mit BasenAuszugsweise vorgetragen auf dem V. Symposium on Organic Sulphur Chemistry in Lund/Schweden, 5.-9. Juni 1972. (1973)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1973 (1973), S. 1317-1328 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,3-Butadienylsulfonium Salts, II1)  -  Reaction of trans-(1,3-Butadienyl)dimethylsulfonium Halides with Bases**)Some reactions of butadienylsulfonium salts with alkali hydroxide, thiophenolate, and alkoxides are described. With catalytic amounts of alkoxide in alcoholic solution the dienylsulfonium salts 1a, b yield (2,4-dialkoxybutyl)sulfonium salts 7 and/or (alkoxybutenyl)-sulfonium salts 4 and 6. At high alkoxide concentration the main products are substituted butenyl sulfides 9, formed by [2,3]-sigmatropic rearrangement of the 4-ylides. Under the same conditions (2,3-dimethyl-1,3-butadienyl)dimethylsulfonium bromide (1c) rearranges to 2-methyl-3-methylene-5-methylthio-1-pentene (16).
    Notes: Einige Reaktionen der Butadienylsulfoniumsalze 1 mit Alkalihydroxid, Thiophenolat und Alkoholaten werden beschrieben. Mit katalytischen Mengen Alkoholat ergeben die Dienylsulfoniumsalze 1a, b in alkoholischer lösung die (2,4-Dialkoxybutyl)sulfoniumsalze 7 und/oder die (Alkoxybutenyl)sulfoniumsalze 4 und 6. Bei hohen Alkoholatkonzentrationen werden durch [2,3]-sigmatrope Umlagerung der 4-Ylide hauptsächlich die substituierten Butenylsulfide 9 gebildet. (2,3-Dimethyl-1,3-butadienyl)dimethylsulfoniumbromid (1c) liefert unter diesen Bedingungen 2-Methyl-3-methylen-5-methylthio-1-penten (16).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197319730813
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  • 12
    Electronic Resource
    Electronic Resource
    Zur Chemie der Schwefeldiimide, IV1) Dehydrierungen mit N,N′-Bis(p-toluolsulfonyl)schwefeldiimid Herrn Prof. Dr. Dres. W. Schultheis zum 70. Geburtstag gewidmet. (1974)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1974 (1974), S. 847-852 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry of Sulfur Diimides, IV1). - Dehydrogenations by N,N′-Bis(p-toluenesulfonyl)- sulfur DiimideN,N′-Bis(p-toluenesulfonyl)sulfur diimide (1) dehydrogenates hydrazo compounds to azo compounds, hydroquinones and pyrocatechol to quinones, thiols to disulfides and dihydronaphthalenes to naphthalenes, in most cases under mild conditions. The reaction of 1 with benzyl alcohols and oximes resembles an SNi- or SNi′-process.
    Notes: N,N-Bis(p-toluolsulfonyl)schwefeldiimid (1) dehydriert, meist unter milden Bedingungen, Hydrazoverbindungen zu Azoverbindungen, Hydrochinon und Brenzcatechin zu Chinonen, Thiole zu Disulfiden sowie Dihydronaphthaline zu Naphthalinen. Die Umsetzung von 1 mit Benzylalkoholen und Oximen erfolgt nach Art einer SNi- oder SNi′-Reaktion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197419740602
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  • 13
    Electronic Resource
    Electronic Resource
    Kreuzbeziehungen von Substituenteneinflüssen bei der Claisen-Umlagerung (1975)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1975 (1975), S. 1733-1743 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cross-correlations for the Influence of Substituents in the Claisen RearrangementThe kinetics of the Claisen rearrangement of trans-cinnamyl aryl ethers 1 with substituents OR both benzene rings has been investigated. The rates follow the simple Hammett equation only for compounds substituted in the cinnamyl group.
    Notes: Die Kinetik der Claisen-Umlagerung von trans-Cinnamylaryläthern 1, die an beiden Benzolkernen substituiert sind, wurde untersucht. Einfache Hammett-Beziehungen ergeben sich nur für die Umlagerungsgeschwindigkeiten bei Variation des Substituenten am Cinnamylrest.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197519751002
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  • 14
    Electronic Resource
    Electronic Resource
    Die Isopropylgruppe als stereochemische Sonde; 13C-NMR-Untersuchungen an Menthan- und Isomenthanderivaten (1978)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1978 (1978), S. 87-97 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Isopropyl Group as a Stereochemical Probe; C-NMR Investigations of Menthane- and Isomenthane DerivativesThe 13C-NMR spectra of 22 menthane and isomenthane derivatives are reported. The influence of substituents on the chemical shifts of the ring carbon atoms is discussed. The chemical shifts of the signals of the (CH3)2C8H - C4H(CH2-)2 fragment depend strongly on the position of the rotamer equilibrium around the C8-C4-bond. Hence the isopropyl group can be used as a probe for differentiation between constitutional and stereoisomeric cyclohexane derivatives as well as for the estimation of conformational equilibria.
    Notes: Die 13C-NMR-Spektren von 22 Menthan- und Isomenthanderivaten werden interpretiert, und der Substituenteneinfluß auf die 13C-chemische Verschiebung der Gerüst-C-Atome wird diskutiert. Es zeigt sich, daß die Verschiebungen der Signale des Fragments (CH3)2C8H - C4H(CH2-)2 stark von der Lage des Rotamerengleichgewichts um die C8-C4-Bindung abhängen. Die Isopropylgruppe kann daher als Sonde zur Unterscheidung von konstitutions-und stereoisomeren Cyclohexanderivaten sowie zur Abschätzung von Konformationsgleichgewichten benutzt werden.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197819780111
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  • 15
    Electronic Resource
    Electronic Resource
    Aliphatische α-substituierte Nitroso-Verbindungen, I. Zur Chemie und Stereochemie von α-substituierten 3-Nitrosomenthanen (1971)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 747 (1971), S. 172-190 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Aliphatic α-Substituted Nitroso Compounds, I. Chemistry and Stereochemistry of α-Substituted 3-Nitrosomenthanes3-Nitroso-3-halo- or 3-nitroso-3-acyloxymenthanes 2 are prepared. Their isomerisation to the diastereoisomeric 6 and the substitution reactions of the halogen derivatives are investigated. UV- and NMR-spectra as well as CD-curves of the nitrosomenthanes 2 and 6 are used to obtain information about the stereochemistry of these compounds (tables 1-4, figures 1 and 2).
    Notes: 3-Nitroso-3-halogen- bzw. 3-Nitroso-3-acyloxy-menthane 2 werden dargestellt. Ihre Isomerisierung zu den Diastereomeren 6 und die Substitution des Halogens werden untersucht. UV- und NMR-Spektren sowie CD-Kurven der 3-Nitroso-menthane 2 und 6 werden zu Aussagen über die Stereochemie benutzt (Tabb. 1-4, Abb. 1 und 2).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19717470118
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  • 16
    Electronic Resource
    Electronic Resource
    Polyhydroxyamino-Verbindungen via Dien-Synthese mit Nitroso-Verbindungen, III1) Darstellung und Stereochemie von 1-[p-Chlor-anilino]-2.3.4-trihydroxy-cyclohexan-Derivaten (1970)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 738 (1970), S. 113-124 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polyhydroxyamino Compounds via Diene Synthesis of Nitroso Compounds, III1).Preparation and Stereochemistry of 1-p- Chloroanilino-2,3,4-trihydroxycyclohexene DerivativesThe preparation of 5 stereoisomeric N-acetyl-l-[p-chloroanilino]-2,3,4-triacetoxycyclo-hexanes (4a-e) is described; their configurations follow from the synthetic route and their properties.
    Notes: Die Darstellung von 5 stereoisomeren N-Acetyl-l -[p-chlor-anilino]-2.3.4-triacetoxy-cyclo-hexanen (4a-e) wird beschrieben. Ihre Konfigurationen folgen aus dem Syntheseweg und ihren Eigenschaften.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19707380113
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  • 17
    Electronic Resource
    Electronic Resource
    Zur Stereochemie von Allenen, I. Darstellung und optische Spaltung einer Gruppe von Allencarbonsäuren (1972)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 756 (1972), S. 112-127 
    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 Stereochemistry of Allenes, I.  -  Preparation and Optical Resolution of a Series of Allenecarboxylic AcidsThe preparation and the optical resolution of some allenecarboxylic acids 1 are reported.
    Notes: Es werden die Darstellung und die optische Spaltung von Allencarbonsäuren 1 beschrieben.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19727560111
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  • 18
    Electronic Resource
    Electronic Resource
    Heterocyclen durch Diensynthese, IV1) 3-Hydroxypyrrole aus Diels-Alder-Addukten von Nitrosoverbindungen (1973)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1973 (1973), S. 650-658 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heterocycles by Diene Synthesis, IV1). - 3-Hydroxypyrroles from Diels-Alder Adducts of Nitroso CompoundsThe methyl 2-acetoxy-4-aryl-1,3-butadiene-1-carboxylates 1 are synthesized and then allowed to react with nitrosobenzenes 2 to give mixtures of the Diels-Alder adducts 3 and 4. The isomer ratio 3 : 4 is dependent on the nature of the aryl substituents in 1 and 2; this dependence may be explained by the mechanism of the cycloaddition. - The adducts 3 are converted into 3-hydroxypyrrole-2-carboxylic acid derivatives by chromatography on silica.
    Notes: 2-Acetoxy-4-aryl-1,3-butadien-1-carbonsäure-methylester 1 werden synthetisiert und mit Nitrosobenzolen 2 zu Gemischen der isomeren Diels-Alder-Addukte 3 und 4 umgesetzt. Die Abhängigkeit des Isomerenverhältnis 3 : 4 von den Arylsubstituenten in 1 und 2 ist aus dem Mechanismus der Cycloaddition verständlich. - Die Addukte 3 lassen sich durch Chromatographie an Kieselgel in 3-Hydroxypyrrol-2-carbonsäurederivate 5 überführen.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197319730414
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  • 19
    Electronic Resource
    Electronic Resource
    1,6-Cyclisierungen von Phenyliminomethyliminokumulenen: Bildung von Chinazolinderivaten (1973)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1973 (1973), S. 1457-1466 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,6-Cyclization of Phenyliminomethylimino Cumulenes: Formation of Quinazoline DerivativesThe reaction of N2-arylamidines 1 with N-tosylisocyanodichloride gives the quinazoline derivatives 5. Addition of the compounds 1 to chloral followed by treatment with acetic anhydride yields the quinazolines 9, 10 and 13.
    Notes: Die Reaktion von N2-Arylamidinen 1 mit N-Tosylisocyandichlorid 4 führt zu den Chinazolinderivaten 5. Bei der Umsetzung der Verbindungen 1 mit Chloral und nachfolgender Behandlung mit Acetanhydrid werden die Chinazoline 9, 10 und 13 erhalten.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197319730906
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  • 20
    Electronic Resource
    Electronic Resource
    Aliphatische α-substituierte Nitrosoverbindungen, II. Zur Chemie und Stereochemie einiger α-Chlornitrosoterpene (1975)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1975 (1975), S. 1009-1017 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Aliphatic α-Substituted Nitroso Compounds, II. - Chemistry and Stereochemistry of Some α-Chloro Nitroso TerpenesDiastereomeric α-chloro nitroso compounds derived from carvomenthone, 3-methylcyclo- hexanone, fenchone and camphor have been synthesized. Their stereochemistry is discussed in terms of 1H-NMR and CD data.
    Notes: Diastereomere α-Chlornitrosoverbindungen, die sich von Carvomenthon, 3-Methylcyclo- hexanon, Fenchon und Campher ableiten, werden dargestellt und einige ihrer Umsetzungen untersucht. Die Stereochemie der Verbindungen, erschlossen aus ihren 1H-NMR- und CD- Spektren, wird diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197519750518
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