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  • 1970-1974  (10)
  • 1960-1964
  • 1970  (10)
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  • 1970-1974  (10)
  • 1960-1964
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  • 1
    Electronic Resource
    Electronic Resource
    Orthoamide, XIII Untersuchungen zum Reaktionsmechanismus der elektrophilen Substitution des Formyl-H-Atoms bei Orthoameisensäureamid-Derivaten (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 256-264 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orthoamides, XIII Studies on the Mechanism of Electrophilic Substitution of the Formyl-H Atom in Ortho Formic Acid AmidesOrtho formic acid amides and N-halogen carboxylic acid amides, halogen ureas or N-chloro urethanes primarily react to give adducts; these form ylides in the presence of bases. The ylides react by an intramolecular SE1- or SNi-mechanism to give O,N-acetals of the corresponding acyl isocyanates (isoureas).
    Notes: Bei der Umsetzung von Orthoamiden mit N-Halogen-carbonsäureamiden, -harnstoffen und N-Chlor-urethan wurden Primär-Addukte nachgewiesen. Diese bilden in Gegenwart von Basen Ylide, welche über einen intramolekularen SE1- oder SNi-Mechanismus C-N-Knüpfung eingehen unter Bildung von O.N-Acetalen der entsprechenden Acylisocyanate (Isoharnstoffe).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030133
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  • 2
    Electronic Resource
    Electronic Resource
    Reaktionen mit Halogenwasserstoffaddukten der Nitrile, IV Zur Struktur von 6-Chlor-pyridonen-(2) (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 398-406 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Hydrogen Halide Adducts of Nitriles, IV The Structure of 6-Chloro-2 pyridonesThe Structure of 6-Chloro-2-pyridones in solid state and in solution is investigated by molecular weight determinations and i.r., n. m. r., and u.v.-spectra.Concentrated solutions of the pyridones in chloroform contain mainly dimers. The i.r.-spectra show that in the solid state the substances are present in the pyridone form. In solution monomeric 6-chloro-2-pyridones are in equilibrium with appreciable amounts of their hydroxy tautomers. The position of the equilibrium depends strongly on the solvent.
    Notes: Die Struktur von 6-Chlor-pyridonen-(2) wird mit Hilfe von Molekular-gewichtsbestimmungen, IR-, NMR- und UV-Spektren untersucht. Konzentrierte Lösungen der Pyridone in Chloroform enthalten vorwiegend Dimere. IR-Spektren zeigen im kristallinen Zustand die Lactamstruktur an. Monomere 6-Chlor-pyridone-(2) stehen mit 6-Chlor-2-hydroxy-pyridinen im Gleichgewicht. Die Lage des Gleichgewichts ist stark lösungsmittelabhängig.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030210
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  • 3
    Electronic Resource
    Electronic Resource
    Orthoamide, XI Umsetzungen von Dimethylformamid-dialkylacetalen mit Isocyanaten (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 236-244 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orthoamides, XI Reactions of Dimethylformamide Dialkyl Acetals with IsocyanatesDimethylformamide dialkyl acetals react with aliphatic and aromatic isocyanates to give parabanic acid O,N-acetals (= 1,3-disubstituted 5-dimethylamino-5-alkoxy-2,4-dioxoimidazolidines) (1). It is likely that an ylide is formed as an intermediate, as shown by reactions.
    Notes: Bei der Umsetzung von Dimethylformamid-dialkylacetalen mit aliphatischen und aromatischen Isocyanaten entstehen Parabansäure-O.N-acetale (= 1.3-disubstituierte 5-Dimethylamino-5-alkoxy-2.4-dioxo-imidazolidine) (1). Die Bildung eines Ylids als Zwischenprodukt konnte wahrscheinlich gemacht werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030131
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  • 4
    Electronic Resource
    Electronic Resource
    Reaktionen mit Halogenwasserstoffaddukten der Nitrile, III Ein neue Pyridinsynthese (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 389-397 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Hydrogen Halide Adducts of Nitriles, III. New Synthesis of PyridinesThe reactions of unsaturated γ-cyanocarboxylic acid chlorides (3, 6, 9, 12) with hydrogen chloride in aliphatic ethers yield 6-chloro-2-pyridones (13-16). In order to study the structure of these compounds, they were converted to 6-chloro-2-methoxypyridines 20-23 and 6-chloro-l-methyl-2 pyridones 24-27.
    Notes: Die Reaktion von ungesättigten γ-Cyan-carbonsäurechloriden (3, 6, 9, 12) mit Chlorwasserstoff führt zu 6-Chlor-Pyridonen-(2) (13-16). Diese werden in die für Strukturuntersuchungen erforderlichen 6-Chlor-2-methoxy-pyridine 20-23 und 6-Chlor-l-methyl-pyridone-(2) 24-27 übergeführt.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030209
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  • 5
    Electronic Resource
    Electronic Resource
    Reaktionen mit Halogenwasserstoffaddukten der Nitrile, V Synthese von Derivaten des 3.4-Dihydro-pyridins (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 407-412 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Hydrogen Halide Adducts of Nitriles, V Synthesis of 3,4-Dihydropyridines6-Chloro-5-aryl-3,4-dihydro-2-pyridones (6-9) are obtained by reaction of 4-aryl-4-cyanobutyryl chlorides (1-4) with hydrogen chloride in p-dioxane. The cyclisation reactions are only possible if α-chloro-enamines can be formed as intermediates.
    Notes: 4-Aryl-4-cyan-butyrylchloride (1-4) cyclisieren in Gegenwart von Chlorwasserstoff zu 6-Chlor-5-aryl-3.4-dihydro-pyridonen-(2) (6-9). Die Ringschlußreaktion erfolgt nur dann, wenn intermediär α-Chlor-enamine gebildet werden können.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030211
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  • 6
    Electronic Resource
    Electronic Resource
    Orthoamid, XIV. Über die Umsetzung von p-Tolyl- und Anisaldehyd mit einem Aminal-tert.-butylester zu [1.2-Bis-dimethylamino-vinyl]-aryl-ketonen (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 2980-2983 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orthoamides, XIV. On the Reaction of p-Tolyl- and Anisaldehyde with Formic Acid Bis(dimethylaminal) tert-Butyl Ester to [1,2-Bis(dimethylamino)vinyl]-aryl Ketones (4, 5). The reaction is supposed to proceed via bis(dimethylamino)methyl aryl ketone (A, which undergoes disproportionation in a kind of Cannizzaro reaction to yield dimethylaminomethyl aryl ketone 6, isolated as an intermediate.
    Notes: Aus tert-Tolyl(1) bzw. Anisaldehyd (2) entstehen mit Bis-dimethylamino-tert-. butyloxy-methan (3) [1.2-Bis-dimethylamino-vinyl]-aryl-aryl-ketone (4, 5). Ihre Bildung wird über ein intermediäres Bis-dimethylaminomethyl-aryl-keton (A gedeutet, das in einer Art Cannizzaro-Reaktion u.a. das als Zwischenprodukt isolierte Dimethylaminomethyl-aryl-keton 6 ergibt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030935
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  • 7
    Electronic Resource
    Electronic Resource
    Neue Synthese des Chinazolinsystems (1970)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 82 (1970), S. 548-549 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19700821406
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesen in der heterocyclischen Reihe, XIII1) Über die Nitrosierung CH-acider Alkylgruppen an Heterocyclen (1970)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 737 (1970), S. 39-45 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses in the Heterocyclic Series, XIII1). Nitrosation of Acidic Alkyl Hydrogen in Heterocyclic CompoundsOn nitrosation with ethyl nitrite in the presence of an excess of hydrogen chloride, methylheterocycles afford hydrochloride salts of the aldoximes which may be liberated by treatment with aqueous potassium hydrogen carbonate. Formation of a quasi-p-quinoid intermediate is thought to be a necessary step in the course of the reaction.
    Notes: Die Nitrosierung von Methylheterocyclen mit Äthylnitrit in Gegenwart von überschüssiger Salzsäure führt zu den Aldoxim-hydrochloriden, die sich mit wäßriger Kaliumhydrogencarbonat-Lösung in die freien Aldoxime (Tab. 1, S. 44) überführen lassen. Für den Reaktionsablauf wird die Ausbildung eines quasi-p-chinoiden Zwischenproduktes gefordert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19707370104
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesen in der heterocyclischen Reihe, XIV1) Formylierung von 4-Methyl-pyrimidin und Reaktionen des 2-[Pyrimidinyl-(4)]-malondialdehyds (1970)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 737 (1970), S. 46-52 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses in the Heterocyclic Series, XIV1). Formylation of 4-Methylpyrimidine and Reactions of 2-[4-Pyrimidinyl]-malondialdehydeWith an excess of dimethylchloromethyleneiminium chloride 4-methylpyrimidine (1) gives 2-[4-pyrimidinyl]-malonic-dialdehyde (2), while with the stoichiometric quantity of the chloride and of hydrogen chloride N,N-dimethyl-2-[4-pyrimidinyl]-vinylamine (3) is formed. In the same way as the nitrosation this reaction is believed to proceed by a quasi p-quinoid intermediate. On reaction with hydrazines or formamide, 2 yields 4-[4-pyrazolyl]-pyrimidines (4, 5) or 4-[5-pyrimidinyl]-pyrimidine (6); on reaction with N-alkyl-substituted salts of benzothiazole or benzoselenazole γ-substituted pentacyanines (10a-c and 12) result.
    Notes: Die Formylierung von 4-Methyl-pyrimidin (1) mit überschüssigem Dimethylformamidchlorid (Dimethyl-chlormethylen-immoniumchlorid) zu 2-[Pyrimidinyl-(4)]-malondialdehyd (2) und mit äquimolaren Mengen Dimethylformamidchlorid/HCl zu N.N-Dimethyl-2-[pyrimidinyl-(4)]-vinylamin (3) erfolgt analog der Nitrosierung über ein quasi-p-chinoides Zwischenprodukt. 2 gibt mit Hydrazinen bzw. Formamid Ringschluß-Reaktionen zu 4-[Pyrazolyl-(4)]-pyrimidinen (4, 5) bzw. 4-[Pyrimidinyl-(5)]-pyrimidin (6); mit N-Alkyl-substituierten Benzthiazolium- oder Benzselenazolium-Salzen entstehen γ-substituierte Pentamethincyanin-Farbstoffe (10a-c und 12).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19707370105
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  • 10
    Electronic Resource
    Electronic Resource
    A New Synthesis of the Quinazoline System (1970)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 9 (1970), S. 523-524 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.197005232
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